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Primes MSM Operating Manual

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Operating Manual
Translation of the original instructions
MicroSpotMonitor MSM
LaserDiagnosticsSoftware LDS 2.98
Revision 01/2019 EN

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  • Page 1 Operating Manual Translation of the original instructions MicroSpotMonitor MSM LaserDiagnosticsSoftware LDS 2.98 Revision 01/2019 EN...
  • Page 3 MicroSpotMonitor MSM IMPORTANT! READ CAREFULLY BEFORE USE. KEEP FOR FUTURE USE. Revision 01/2019 EN...

  • Page 4: Table Of Contents

    Disassemble the transport lock ....................16 Assemble the transport lock ....................17 Installation Preparation and mounting position ..................17 Manually aligning the MicroSpotMonitor MSM .................18 7.2.1 Important conditions for the position of the focused laser beam ........18 7.2.2 Positioning the focused laser beam above the measuring objective ......19 7.2.3...
  • Page 5 MicroSpotMonitor MSM Description of the LaserDiagnosticsSoftware LDS 12.1 Graphical user interface ......................34 12.1.1 The menu bar ......................36 12.1.2 The toolbar .......................37 12.1.3 Menu overview ......................38 12.2 File ............................41 12.2.1 New (menu File > New) ....................41 12.2.2 Open (menu File > Open) ..................41 12.2.3...
  • Page 6 Single measurement (menu Measurement > Single) ..........102 13.5.9 Caustic measurement (menu Measurement > Caustic) .........104 Troubleshooting 14.1 Error during a measurement ....................108 14.2 No measurement signal at the MicroSpotMonitor MSM ............108 Maintenance and service 15.1 Exchanging the protective window ..................109 15.1.1 Safety instructions ....................109 15.1.2...
  • Page 7 MicroSpotMonitor MSM Dimensions Appendix 21.1 Insert fixed OD filter (option) in the inspection chamber ............117 21.2 File “laserds.ini” – an Example ....................118 21.3 Description of the MDF file format ..................119 21.4 Optical components ......................120 21.4.1 Measuring objective ....................121 21.4.2 Fixed filter and filter wheel ..................126 21.4.3...
  • Page 8 • Beam quality factor M² PRIMES is responsible for both the development, production, and calibration of the measuring devices. This guarantees optimum quality, excellent service, and a short reaction time, providing the basis for us to meet all of our customers’ requirements quickly and reliably.

  • Page 9: Basic Safety Instructions

    Basic safety instructions Intended Use The MicrsoSpotMonitor MSM has been designed exclusively for measurements carried out in or near the optical path of high-power lasers. Please observe and adhere to the specifications and limit values given in chapter 19, „Technical data“, on page 114. Other uses are considered to be improper. The information contained in this operating manual must be strictly observed to ensure proper use of the device.
  • Page 10 MicroSpotMonitor MSM Employing qualified personnel The device may only be operated by qualified personnel. The qualified personnel must have been instructed in the installation and operation of the device and must have a basic understanding of working with high- power lasers, beam guiding systems and focusing units.

  • Page 11: Symbol Explanations

    MicroSpotMonitor MSM Symbol explanations The following symbols and signal words indicate possible residual risks: DANGER Means that death or serious physical injuries will occur if necessary safety precautions are not taken. WARNING Means that death or serious physical injuries may occur if necessary safety precautions are not taken.

  • Page 12: About This Operating Manual

    MicroSpotMonitor MSM About this operating manual This documentation describes how to work with the MicroSpotMonitor MSM and operate it with the LaserDi- agnosticsSoftware LDS 2.98. The software description includes a brief introduction on using the device for measurements. This operating manual describes the software version valid at the time of printing.

  • Page 13: Introduction

    Rayleigh lengths, as demanded in the standard ISO 11146. Optionally, the MicroSpotMonitor MSM can be equipped with a filter wheel with neutral density filters (OD1 to OD5). This filter wheel enables the measurement of power densities between several W/cm² up to several MW/cm²...

  • Page 14: Measuring Principle

    MicroSpotMonitor MSM Measuring principle The MicroSpotMonitor MSM is a camera-based measuring system. Depending on the application, up to 7 different optical components can be in the beam path. The purpose and functioning of individual compo- nents is described in chapter 21.4, „Optical components“, on page 120.

  • Page 15: Short Overview Installation

    Installing the LaserDiagnosticsSoftware LDS on the PC Chapter 11 on page 29 • Software is part of the scope of delivery • Connect the MicroSpotMonitor MSM with the LaserDiagnosticsSoftware LDS Measure Chapter 13 on page 82 • Follow the safety instructions •...

  • Page 16: Transport

    X Handle the measuring device carefully when transporting or installing it. X To avoid contamination, close the measuring objective with the cover provided. X Only transport the device in the original PRIMES transport box (option). Disassemble the transport lock After unpacking the device, the transport lock has to be removed first. The transport lock secures the linear actuator of the z-axis.

  • Page 17: Assemble The Transport Lock

    (see chapter 7.3 on page 21). The MicroSpotMonitor MSM is designed to operate in a horizontal position with a beam incidence from above. With an optional side plate (order no. 801-004-060), operation with horizontal beam incidence is also possible.

  • Page 18: Manually Aligning The Microspotmonitor Msm

    If the focus is too close to the measuring objective, it can – depending on the type of focusing and the power used – damage the entrance lens. Laser beam Upper limit Measuring plane Lower limit Measuring plane distance Measuring objective Fig. 7.1: Measuring range of the MicroSpotMonitor MSM Revision 01/2019 EN...

  • Page 19: Positioning The Focused Laser Beam Above The Measuring Objective

    In order to be able to align the MicroSpotMonitor MSM beneath the laser, an associated alignment tool is provided with each measuring objective. By means of this alignment tool and a pilot laser beam, you can position the device with the necessary accuracy.

  • Page 20: Positioning The Focused Laser Beam Above The Optional Cyclone

    MicroSpotMonitor MSM The measuring plane distance equals the distance of the imaging plane from the upper corner of the mea- suring objective. It does not only depend on the beam path (standard, beam path extension BPE, alignment objective AO) but also on the wavelength (see Tab. 7.1 on page 20).

  • Page 21: Install The Microspotmonitor Msm

    MicroSpotMonitor MSM Install the MicroSpotMonitor MSM DANGER Serious eye or skin injury due to laser radiation If the device is moved from its calibrated position, increased reflected radiation (laser class 4) may result during measuring operation. X When mounting the device, please ensure that it cannot be moved, neither due to an unin- tended push or a pull on the cables and hoses.

  • Page 22: Connect Cooling Circuit (500 W Version Only)

    MicroSpotMonitor MSM Connect cooling circuit (500 W version only) DANGER Fire hazard; Damage/Destruction of the device due to overheating If there is no water cooling or a water flow rate which is insufficient, there is a danger of overheating, which can damage the device or set it on fire.

  • Page 23: Humidity

    MicroSpotMonitor MSM Humidity • The device must not be operated in a condensing atmosphere. The humidity has to be considered in order to prevent condensates within and outside the device. • The temperature of the cooling water must not be lower than the dew point (see Tab. 8.1 on page 23).

  • Page 24: Water Connections And Water Flow Rate

    MicroSpotMonitor MSM Water connections and water flow rate Connection diameter Recommended flow rate Minimum flow rate PE hoses 12 mm 1.5 l/min (1 l/(min · kW) Not lower than 1.0 l/min Tab. 8.2: Water connections and water flow rate Remove the sealing plugs of the water connections 1.

  • Page 25: Electrical Connection

    Please ensure that all electrical connections have been established and switch the device on before starting the LaserDiagnosticsSoftware LDS. The MicroSpotMonitor MSM serves as a dongle for the software on the PC in order to enable cer- tain software functions.

  • Page 26: Pin Assignment

    MicroSpotMonitor MSM Pin assignment 9.2.1 Power supply D-Sub socket, 9-pin (view: connector side) Function RS485 (+) +24 V Trigger RS485 (+) Not assigned RS485 (–) +24 V Trigger RS485 (–) Tab. 9.1: D-Sub socket RS485 9.2.2 Inlet external trigger BNC connector (view: connector side)

  • Page 27: Connection To The Pc And Connect Power Supply

    X Please turn off the PRIMES power supply before disconnecting the cables. 1. Connect the device with the PC via a crossover cable or with the network via a patch cable.

  • Page 28: Status Leds

    Power Green The power supply is switched on Measuring Yellow A measurement is running Tab. 10.1: Description of the status LEDs on the MicroSpotMonitor MSM Power supply Measuring mode Fig. 10.1: Status LEDs on the MicroSpotMonitor MSM Revision 01/2019 EN...

  • Page 29: Installation And Configuration Of The Laserdiagnosticssoftware Lds

    MicroSpotMonitor MSM Installation and configuration of the LaserDiagnosticsSoftware LDS In order to operate the measuring device, the PRIMES LaserDiagnosticsSoftware LDS has to be installed on the computer. The program can be found on the enclosed medium. You will find the latest version on the PRIMES website at: https://www.primes.de/en/support/downloads/ software.html.

  • Page 30: Ethernet Configuration

    The MicroSpotMonitor MSM has a fixed IP address that is specified on the type plate: • If the MicroSpotMonitor MSM is connected directly to the PC, enter the fixed IP address in the menu Communication > Free Communication (see chapter 11.3.2 on page 31).

  • Page 31: Establishing A Connection To Pc (Menu Communication > Free Communication)

    4. Enter in the field “TCP” the IP Address. 5. Click on the Connect button (“connected” appears in the bus monitor). 6. Click on the Find Primes Devices button. 7. Click on the Safe Config button (the configuration is saved and does not need to be re-entered when starting the LaserDiagnosticsSoftware LDS again).

  • Page 32: Changing The Standard Ip Address Of The Device (Menu Communication > Free Communication)

    Changing the standard IP address of the device (menu Communication > Free Communica- tion) If the fixed IP address of the MicroSpotMonitor MSM conflicts with another device bearing the same IP ad- dress on the network, the fixed IP address of the MicroSpotMonitor MSM can be changed.
  • Page 33 MicroSpotMonitor MSM Example: You will change the IP address from 192.168.116.85 to 192.168.116.86. 1. Please start the LaserDiagnosticsSoftware LDS (see chapter 12 on page 34). 2. Open the dialogue window Communication > Free Communication. 3. Choose in the field “Mode” TCP (the option “Second IP” must not be activated!).

  • Page 34: Description Of The Laserdiagnosticssoftware Lds

    MicroSpotMonitor MSM Description of the LaserDiagnosticsSoftware LDS The LaserDiagnosticsSoftware LDS is the control centre for all PRIMES measuring devices which measures the beam distribution as well as focus geometries by means of which the beam propagation characteristics can be determined.
  • Page 35 MicroSpotMonitor MSM The graphical user interface mainly consists of the menu as well as the toolbar by means of which different dialogue or display windows can be called up. Menu bar Tool bar Dialogue window Fig. 12.3: The main elements of the user interface It is possible to open several measuring and dialogue windows simultaneously.

  • Page 36: The Menu Bar

    MicroSpotMonitor MSM 12.1.1 The menu bar In the menu bar, all main and sub menus offered by the program can be opened. Fig. 12.5: Menu bar Revision 01/2019 EN...

  • Page 37: The Toolbar

    MicroSpotMonitor MSM 12.1.2 The toolbar By clicking the symbols in the toolbar, the following program menus can be opened. File administration Notation File selection Plane selection     Fig. 12.6: Symbols in the toolbar 1 - Create a new data record...

  • Page 38: Menu Overview

    - Reference value for the laser power - Focal length - Wavelength - Comment - Device offset (Not relevant for MicrosSpotMonitor MSM) Sensor parameters The following device parameters can be e.g. set here: - The mechanical locked area of the z-axis...
  • Page 39 Communication Rescan bus The system searches the bus for the different device addresses. This is necessary whenever the device configuration at the PRIMES bus was changed after starting the software. Free Communication Display of the communication on the PRIMES bus...
  • Page 40 MicroSpotMonitor MSM Script Editor Opens the script generator, a tool, by means of which complex measuring procedures are controlled automatically (with a script language developed by PRIMES). List Shows a list of the opened windows Python Opens the script generator in order to control complex measuring procedures automati-...

  • Page 41: File

    MicroSpotMonitor MSM 12.2 File This menu includes – among others – the administration of measurement and setting data. 12.2.1 New (menu File > New) By means of New a new file is created. 12.2.2 Open (menu File > Open) By means of Open a selected file is opened.

  • Page 42: Load Measurement Preferences (Menu File > Load Measurement Preferences)

    Load measurement preferences (menu File > Load measurement preferences) Stored settings can be resorted to with Load measurement preferences. The standardized extension for a setting file of the MicroSpotMonitor MSM is “.ptx”. 12.2.8 Save measurement preferences (menu File > Save measurement preferences) The current measurement settings are stored (.ptx-file).

  • Page 43: Edit

    MicroSpotMonitor MSM 12.3 Edit 12.3.1 Copy (menu Edit > Copy) By means of the copy function a direct export of graphics to other programs is possible. In this case the content of the current window is transmitted to the Windows clipboard.

  • Page 44: Measurement

    MicroSpotMonitor MSM 12.4 Measurement 12.4.1 Measuring environment (menu Measurement > Environment) Fig. 12.9: Dialogue window Measuring Environment In the dialogue window Measuring Environment data such as the laser type, focal length etc. can be stored. These data can be read via Presentation > Review.

  • Page 45: Sensor Parameters (Menu Measurement > Sensor Parameter)

    The maximum value corresponds to the value Y3 and Z3. Device By means of this option, you can select the device which is supposed to be operated. Depending on the number of devices connected, additional device numbers are assigned. Not relevant for MicrosSpotMonitor MSM. Revision 01/2019 EN...

  • Page 46: Beam Find Settings

    Generally, 64 pixels per line and a total of 64 lines is sufficient. Please keep in mind that the more pixels there are, the longer the measurement will take. Detector Not relevant for MicrosSpotMonitor MSM. Manual z-axis With this function you can deactivate the z-axes of the measuring system. This is useful if you want to use external movement axes.

  • Page 47: Ccd Info (Menu Measurement > Ccd Info)

    MicroSpotMonitor MSM 12.4.4 CCD info (menu Measurement > CCD Info) The most important device data is shown in the menu Measurement > CCD Device Info. Here you can see the magnification information for the measuring objective and also check which beam path is turned on.

  • Page 48: Ccd Settings (Menu Measurement > Ccd Settings)

    MicroSpotMonitor MSM 12.4.5 CCD settings (menu Measurement > CCD Settings) Fig. 12.12: Dialogue window CCD Settings The wavelength, attenuation, and operating mode are all set in the CCD Settings dialog window. Trigger modes The appropriate settings must be configured here in keeping with the operating mode of the laser to be mea- sured.
  • Page 49 MicroSpotMonitor MSM Integration duration This function sets a defined integration duration. The optimizer must be deactivated before this can be ac- complished, since otherwise the measuring device itself will optimize and thus change the integration dura- tion. This function is also used mainly in measuring pulsed laser systems.

  • Page 50: Lqm Adjustment (Menu Measurement > Lqm Adjustment)

    MicroSpotMonitor MSM 12.4.6 LQM adjustment (menu Measurement > LQM Adjustment) Not relevant for MicrosSpotMonitor MSM. 12.4.7 Power measurement (menu Measurement > Power Measurement) Not relevant for MicrosSpotMonitor MSM. 12.4.8 Single (menu Measurement > Single) Fig. 12.14: Dialogue window Measurement settings...
  • Page 51 Find beam Starts an automatic beam search in the current measuring plane Scan Starts an automatic beam search with the MicrosSpotMonitor MSM. The algorithm works at a fixed z-position and searches only within the range of the specified measuring window.
  • Page 52 Scan command. Once a scan is initiated, the MicroSpotMonitor MSM will automatically sense the measuring area. If a point of maximum intensity can be identified, the MicroSpotMonitor MSM will automatically zoom in on this area and adjust the measuring window size accordingly.
  • Page 53 Start button. Selecting Monitor and pressing the Start button will initiate an ongoing, repeat- ing measurement with the current settings. The repeat rate depends on the spacial resolution and the type of communication between the PC and the MicroSpotMonitor MSM. Zoom function The zoom function allows for detailed magnification of the measuring area.

  • Page 54: Caustic Measurement (Menu Measurement > Caustic)

    MicroSpotMonitor MSM 12.4.9 Caustic measurement (menu Measurement > Caustic) The caustic measurement is a serial measurement where the z position is varied. The results are stored in different planes. A different z-position is assigned to every measuring plane. As the beam radius as well as the power density change in every z position, the position as well as the size of the window and the signal strength can vary from plane to plane.

  • Page 55: Start Adjust Mode (Menu Measurement > Start Adjust Mode)

    The manual caustic measurement consists of a series of individual measurements at various z-positions, with the results being stored in their own planes. 12.4.10 Start adjust mode (menu Measurement > Start Adjust mode) Not relevant for MicrosSpotMonitor MSM. Revision 01/2019 EN...

  • Page 56: Option (Advanced User Only) (Menu Measurement > Option)

    MicroSpotMonitor MSM 12.4.11 Option (advanced user only) (menu Measurement > Option) Fig. 12.16: Dialog window Option Enable beam find process The Beam Find function must be used for caustic measurement. This involves an algorithm that separates the measuring signal from the measurement artifacts (e.g. noise) via an adjustable trigger threshold and adapts the size of the measuring window to this signal.
  • Page 57 MicroSpotMonitor MSM For TopHat and Gaussian beam shaped laser beams, the fill factor should range between 0.5 and 0.7. If the beam has diffraction rings, however, and if these are located completely within the measuring window, the optimal value for the fill factor can be between 0.5 and 0.6.

  • Page 58: Presentation

    MicroSpotMonitor MSM 12.5 Presentation This chapter describes the presentation, analysis and storage of measuring results. In order to carry out comparisons between different measurements, the program can manage several measuring data sets simultaneously. The opened data sets are shown in the toolbar. In order to open one presentation, the data which is to be examined is selected in the list of the data selection and afterwards the desired kind of presentation is chosen.

  • Page 59: False Colors (Menu Presentation > False Colors)

    MicroSpotMonitor MSM 12.5.1 False colors (menu Presentation > False colors) Here, a false color presentation of the measured power density distribution is generated. Fig. 12.18: Dialogue window False colors The used color scale is shown on the left. For a higher sensitivity, e.g. for the analysis of diffraction figures, it is possible to switch the used color scale in the menu Presentation >...

  • Page 60: False Colors (Filtered) (Menu Presentation > False Colors (Filtered))

    MicroSpotMonitor MSM 12.5.2 False colors (filtered) (menu Presentation > False colors (filtered)) The special function of the filter is called spline – function. It is characterized by the fact that the position of the maximum is maintained. The single pixels in the matrix are weighed by means of a 1-2-1 filter in order to reduce the noise.

  • Page 61: Isometry 3D (Menu Presentation > Isometry 3D)

    MicroSpotMonitor MSM 12.5.4 Isometry 3D (menu Presentation > Isometry 3D) This function generates three-dimensional displays of the power density distribution of a plane and all planes in false colors. The presentation window is divided. On the left the caustic, on the right the power density distribution in a plane is displayed.

  • Page 62: Review 86 % Or 2. Moment (Menu Presentation > Review (86%)/(2. Moment))

    MicroSpotMonitor MSM 12.5.5 Review 86 % or 2. moment (menu Presentation > Review (86%)/(2. moment)) For the radius definition there are two basic determination possibilities: • Determination of the beam radii according to the 86% - power definition, (see chapter 22.2.4 on page 145).

  • Page 63: Caustic (Menu Presentation > Caustic)

    MicroSpotMonitor MSM 12.5.6 Caustic (menu Presentation > Caustic) The results of the caustic measurement can be displayed by means of the menu item Presentation > Caustic. On the left Fig. 12.22 on page 63 shows the measured beam parameter either on the basis of the 86%-radii or the 2.
  • Page 64 MicroSpotMonitor MSM Z-position This value provides the position of the focus points in the z-position. As the compensation curve takes the measurement points into consideration, the calculated z-position is not necessarily located at the position, which has measured the smallest radius.
  • Page 65 The related curves are shown via the two check boxes radius x, y while the numerical values are provided by the result window. Raw beam (menu Presentation > Caustic > Raw Beam) Not relevant for MicrosSpotMonitor MSM. Revision 01/2019 EN...
  • Page 66 MicroSpotMonitor MSM Review (menu Presentation > Caustic > Review) This function checks whether the results and settings of the caustic measurement are within the reliable range. Not ok Borderline results (in the measuring planes 2, 4, 6, 7 and 8) Fig.

  • Page 67: Raw Beam (Menu Presentation > Raw-Beam)

    12.5.7 Raw beam (menu Presentation > Raw-beam) Not relevant for MicrosSpotMonitor MSM. Revision 01/2019 EN...

  • Page 68: Symmetry Check (Menu Presentation > Symmetrycheck)

    MicroSpotMonitor MSM 12.5.8 Symmetry check (menu Presentation > SymmetryCheck) This display menu checks the rotational symmetry of the power density distribution of a laser beam. It can, for instance in connection with the monitoring operation (Measurement > Single > Monitor), be used for the alignment of laser resonators.

  • Page 69: Fixed Contour Lines (Menu Presentation > Fixed Contour Lines)

    MicroSpotMonitor MSM Fig. 12.27: Dialoque window Symmetry check in polar coordinates of an elliptic beam On the screen the curves appear in different colors. The radius is indicated in pixel coordinates. The mini- mum as well as the maximum of the radius values can be chosen. On the right side the standard deviation of the different radius values are indicated.

  • Page 70: Variable Contour Lines (Menu Presentation > Variable Contour Lines)

    MicroSpotMonitor MSM 12.5.10 Variable contour lines (menu Presentation > Variable Contour Lines) Here the spatial power density distribution is displayed by means of freely selectable contour lines. Not only intersections in x- and y- direction but also in power density coordinates (A/D-converter-counts) can be car- ried out.
  • Page 71 MicroSpotMonitor MSM One click on the CCD Info button will open a window with additional information on the device parameters such as trigger mode, trigger delay, integration duration, magnification, and focussing optic type. Fig. 12.30: Display window CCD Info Revision 01/2019 EN...

  • Page 72: Graphical Review (Menu Presentation > Graphical Review)

    Display window Graphical review – Example for assessment of a time series - radius/time See chapter 12.4.9 on page 54, Section „Manual caustic measurement as time series (menu Measure- ment > Caustic > Manually adjusted)“. 12.5.12 Systemstate (menu Presentation > Systemstate) Not relevant for MicrosSpotMonitor MSM. Revision 01/2019 EN...

  • Page 73: Evalution Parameter View (Menu Presentation > Evalution Parameter View)

    Display window Evalution Parameter View with opened parameter file The desired parameters and their limit values can be stipulated by means of the program PRIMES-EvalEditor and can then be saved in the evaluation parameter file (*.eval). The program is automatically installed when the LDS-setup is carried out.

  • Page 74: Evaluate Document (Menu Presentation > Evaluate Doc)

    MicroSpotMonitor MSM The evaluation parameter file can only be displayed if the file BeamControls.xsd is located in the same directory (C:\Program\Primes\LDS2.98\System)! 12.5.14 Evaluate document (menu Presentation > Evaluate doc) The evaluation function compares selectable beam parameters and their adjustable limit values with the results of a current or a saved measurement.
  • Page 75 MicroSpotMonitor MSM Evaluation Criteria: Only if all single evaluations are ok, the overall evaluation is displayed in green in the traffic light symbol. Fig. 12.35: Dialoque window Evaluate In case the warning or limit values are exceeded, this has an influence on the color display of the traffic light symbol.

  • Page 76: Color Tables (Menu Presentation > Color Tables)

    MicroSpotMonitor MSM 12.5.15 Color tables (menu Presentation > Color Tables) Different color charts are available. It is possible to switch back and forth between the color charts. Thus the assignment of A/D converter values and different color scales can be varied. This is important for the false color presentation.

  • Page 77: Position (Menu Presentation > Position)

    MicroSpotMonitor MSM 12.5.17 Position (menu Presentation > Position) This menu can be used to move the device to its parked position. Fig. 12.39: Dialoque window Postition 12.5.18 Evaluation (option) (menu Presentation > Evaluation) By means of this evaluation function, you can compare and evaluate different parameters of the measured caustic (.foc-file) with specified limit values (.pro-file).
  • Page 78 MicroSpotMonitor MSM Fig. 12.41: Example for a profile file An evaluation is carried out as follows: 1. Click the button Open Doc and choose your measuring file (.foc-file). 2. Click the button Open Profile and choose your profile file (.pro-file).

  • Page 79: Communication

    This menu can be used to reconnect a device that was connected previously. 12.6.2 Free communication (menu Communication > Free Communication) By means of this menu you can control the communication via the PRIMES bus. Moreover, the settings for the communication are made here (see chapter 11.3.2 on page 31). Fig. 12.42: Dialoque window Communication >...

  • Page 80: Scan Device List (Menu Communication > Scan Device List)

    Scan device list (menu Communication > Scan device list) Every PRIMES device has a certain bus address. If a device is supposed to be controlled by means of the LaserDiagnosticsSoftware LDS, the address has to be entered here. Moreover addresses can also be added or deleted in this menu.

  • Page 81: Script (Menu Script)

    81. Python is a programming language with efficient abstract data structures and a simple but effective approach for an object-oriented programming. Python is not only suitable for scripts but also for a fast ap- plication development. For programming with Python a separate PRIMES documentation is available. Revision 01/2019 EN...

  • Page 82: Measurement

    X Only operate the device with a clean protective window. NOTICE Damaging/destroying the device Obstacles in the movement range of the MicroSpotMonitor MSM can lead to collisions and damage the device. X Keep the movement range free of obstacles (cutting nozzle, pressure rolls, etc.).

  • Page 83: Selection And Change Of Measuring Objectives

    The selection of the right measuring objective is of crucial importance when it comes to the quality of the measurement with the MicroSpotMonitor MSM. The measuring objective must be optimally matched to the wavelength, the numerical aperture and the focus size to be measured.
  • Page 84 MicroSpotMonitor MSM The following table contains the limits that have to be observed when it comes to standard objectives as well as further objective data. Standard Objective Max. measuring window Min. resolution Min. beam diameter Max. beam diameter 3.3x 1.4 mm 1.4 μm...

  • Page 85: Exchanging The Measuring Objective

    MicroSpotMonitor MSM 13.2.2 Exchanging the measuring objective 1. Unscrew the two knurled screws (see Fig. 13.2 on page 85). 2. Remove the measuring objective upwards. • Please note that the measuring objective is fixed by two dowel pins and does not tilt during removal.

  • Page 86: Damage Thresholds

    MicroSpotMonitor MSM 13.2.3 Damage thresholds The operating limits of the MicroSpotMonitor MSM are determined by the damage thresholds of the optical components. As described in chapter 21.4.1 on page 121, two different cases have to be considered. NOTICE Damaging/destroying the measuring objective Power densities which are too high can destroy the measuring objective.
  • Page 87 MicroSpotMonitor MSM The graphs in Tab. 13.2 on page 87 and Tab. 13.3 on page 88 can be used to estimate the minimum distance. Measuring plane distance PRIMES 10x-h without BPE Measuring plane distance PRIMES 3,3x-s without BPE F = 5...
  • Page 88 MicroSpotMonitor MSM Measuring plane distance PRIMES 10x-h without BPE Measuring plane distance PRIMES 3,3x-s without BPE 530 nm 1064 nm = 5 μm M² = 1 = 8 μm = 10 μm = 15 μm = 30 μm = 50 μm Distance between focus and measuring objective in mm Tab.

  • Page 89: Prepare Measurement

    MicroSpotMonitor MSM 13.3 Prepare measurement The following check lists should help you to realise the most important conditions for a measurement and to carry out all necessary settings of the LaserDiagnosticsSoftware LDS. 13.3.1 Check list measurement settings The device is stable and fixed.

  • Page 90: Flowchart Of A Measurement

    13.4 Flowchart of a measurement 13.4.1 Prepare measurement Search caustic Preparation settings Focus found? Positioning z-axis: MSM 35 = 18 mm MSM 120 = 60 mm Check alignment again Select Magnification Check Increase laser Low x 0.3 saturation power on the device...

  • Page 91: Perform Caustic Measurement

    MicroSpotMonitor MSM 13.4.3 Perform caustic measurement First caustic measure- ment Enter caustic limit values Start measuring Set number of mea- program surement planes to 21 Increase Open laser power new file Carry out asymmetric Start measurement Start caustic measurement − 3 z to + 1 z...

  • Page 92: Perform Measurement Settings In The Laserdiagnosticssoftware Lds

    MicroSpotMonitor MSM 13.5 Perform measurement settings in the LaserDiagnosticsSoftware LDS The following explanations of the configuration options should help you to make the right settings for the respective task. The following chapters highlight important configuration options in color: Color Meaning This setting must always be set as shown.

  • Page 93: Sensor Parameters (Menu Measurement > Sensor Parameter)

    MicroSpotMonitor MSM 13.5.1 Sensor parameters (menu Measurement > Sensor parameter) Adaptable squares Fig. 13.7: Dialogue window Sensor parameters Mechanical limits By pulling the turquoise square with the mouse pointer you can restrict the movement range of the y- and z- axis.

  • Page 94: Measuring Environment (Menu Measurement > Environment)

    MicroSpotMonitor MSM 13.5.2 Measuring environment (menu Measurement > Environment) Fig. 13.8: Dialogue window Measuring Environment Focal length Stating the focal length is relevant for the evaluation of the caustic measurements. From the caustic process and the entered focal length the raw beam diameter on the focussing optic can be calculated.

  • Page 95: Measurement Settings (Menu Measurement > Single)

    MicroSpotMonitor MSM 13.5.3 Measurement settings (menu Measurement > Single) Fig. 13.9: Dialogfenster Messeinstellungen Controlling measuring modes (individual measurement, monitor, and video mode) There is a total of three different measuring modes that can be selected here. In the Individual Measure- ment and Monitor measuring mode, all necessary compensations (smear effect, diffusion) and exposure time adjustments are performed every time a new measurement is carried out.

  • Page 96: Caustic Settings (Menu Measurement > Caustic)

    MicroSpotMonitor MSM 13.5.4 Caustic settings (menu Measurement > Caustic) Fig. 13.10: Dialogue window Caustic settings Parameters (start number of the plane) Under Start, the start number at which the measurement is initiated can be entered for the plane. By default, the start number is generally set to zero and should only be changed when you are measuring in an existing document and don’t want the existing measurement data to be overwritten.
  • Page 97 MicroSpotMonitor MSM surement duration considerably, but does require that the location and parameters of the laser beam change only minimally. Beam search This selection field specifies which plane the caustic measurement should be started in. If the optional Beam Find function is activated in the Options dialog window, that is also the plane in which this function will be performed.

  • Page 98: Ccd Settings (Menu Measurement > Ccd Settings)

    MicroSpotMonitor MSM 13.5.5 CCD settings (menu Measurement > CCD Settings) Fig. 13.11: Dialogue window CCD Settings The wavelength, attenuation, and operating mode are all set in the CCD Settings dialog window. Trigger modes The appropriate settings must be configured here in keeping with the operating mode of the laser to be mea- sured.
  • Page 99 MicroSpotMonitor MSM Integration duration This function sets a defined integration duration. The optimizer must be deactivated before this can be ac- complished, since otherwise the measuring device itself will optimize and thus change the integration dura- tion. This function is also used mainly in measuring pulsed laser systems.

  • Page 100: Option (Advanced User Only) (Menu Measurement > Option)

    MicroSpotMonitor MSM 13.5.6 Option (advanced user only) (menu Measurement > Option) Fig. 13.12: Dialog window Option Enable beam find process The Beam Find function must be used for caustic measurement. This involves an algorithm that separates the measuring signal from the measurement artifacts (e.g. noise) via an adjustable trigger threshold and adapts the size of the measuring window to this signal.

  • Page 101: Ccd Info (Menu Measurement > Ccd Info)

    MicroSpotMonitor MSM For TopHat and Gaussian beam shaped laser beams, the fill factor should range between 0.5 and 0.7. If the beam has diffraction rings, however, and if these are located completely within the measuring window, the optimal value for the fill factor can be between 0.5 and 0.6.

  • Page 102: Single Measurement (Menu Measurement > Single)

    It allows you to do a beam search manually or using the Scan function. When a Scan is triggered, the MicroSpotMonitor MSM automatically tests the measuring range. When a point of maximum intensity is detected, the MicroSpotMonitor MSM automatically zooms to this point and adjusts the measuring window size.
  • Page 103 MicroSpotMonitor MSM The video mode only functions when using ethernet communications. The MicroSpotMonitor MSM provides 4 frames per second in video mode. Unlike the monitoring operation, only raw data is transmitted in video mode. If the detector is overdriven during a measurement (the appearance of red in the representation and/or an A/D-Converter value of 4 095 in a clear section indicates signal saturation), you should reduce the amplifi-...

  • Page 104: Caustic Measurement (Menu Measurement > Caustic)

    Prepare a caustic measurement When positioning the MicroSpotMonitor MSM, the beam focus should be in the middle of the z-axis work- ing area. Depending on device accessories or fittings, this is approximately 17 mm above the null position (35 mm for a standard device) of the integrated z-axis.
  • Page 105 MicroSpotMonitor MSM Automatic caustic measurement (menu Measurement > Caustic > Automatic) Fig. 13.16: Dialogue window Caustic settings During automatic caustic measurement, the minimum and maximum z-position is selected together with the number of measuring planes. The measurement cycle begins with an automatic beam search in the specified starting plane.
  • Page 106 MicroSpotMonitor MSM Manual caustic measurement (menu Measurement > Caustic) and (menu Measurement > Single) Fig. 13.17: Dialogue window Caustic settings and Measurement settings The manual caustic measurement consists of a series of individual measurements at various z-positions, with the results being stored in their own planes.
  • Page 107 MicroSpotMonitor MSM Record a time series (menu Measurement > Single) Fig. 13.18: Dialogue window Measurement settings Recording a time series corresponds to manual caustic measurement, but with the z-position staying the same on all planes. 1. Delete the old data in the Edit > Clear all planes dialog window or create a new document File >...

  • Page 108: Troubleshooting

    When there is no measurement signal detected, except for noise which is typically 270 - 300 counts at the MicroSpotMonitor MSM (the current number of counts can be found under the menu item Display > Vari- able Contour Lines, recheck the device position. Besides wrong positioning a too high attenuation can cause the same problem.

  • Page 109: Maintenance And Service

    15.1 Exchanging the protective window The measuring objective of the MicroSpotMonitor MSM can be optionally delivered with a protective window or a protective window with cyclone. The protective window in the beam entrance is a wearing part and can be replaced if necessary. Low levels of contamination of the protective window can be carefully removed when cooled with Isopropanol (observe the manufacturer‘s safety instructions).

  • Page 110: Replacing The Protective Window

    MicroSpotMonitor MSM The protective window is located in the protective window holder of the measuring objective below the retaining ring or cyclone. The retaining ring or the cyclone are attached to the protective window using a spring-loaded bayonet lock with three locking pegs.

  • Page 111: Replacing The Protective Window For Cyclone

    MicroSpotMonitor MSM 15.1.3 Replacing the protective window for cyclone 1. Follow the safety instructions in chapter “15.1.1 Safety instructions” on page 109. 2. Remove the compressed air hoses around the cyclone if necessary. 3. Push the cyclone down against the protective window holder, turn it counterclockwise until it stops and lift it up and off.

  • Page 112: Storage

    German “Used Appliances Register“ (Elektro-Altgeräte-Register “EAR“) with the number WEEE-reg.-no. DE65549202. Provided that you are located in the EU, you are welcome to send your PRIMES devices to the following ad- dress, where they will be disposed free of charge (this service does not include shipping costs): PRIMES GmbH Max-Planck-Str.

  • Page 113: Declaration Of Conformity

    MicroSpotMonitor MSM Declaration of conformity Revision 01/2019 EN...

  • Page 114: Technical Data

    Min. Cooling water flow rate 1,5 l/min Cooling water temperature T Dew point temperatur < T < 30 °C Please consult with PRIMES before doing anything that does not comply with this specification. Communication Interfaces RS485/Ethernet Dimensions and weight 427 (+12) excluding connectors x 202 x 181 mm Dimensions (L x W x H) + 35 mm or 120 mmmovement range...
  • Page 115 MicroSpotMonitor MSM Environmental conditions Operating temperature range 10 – 40 °C Storage temperature range 5 – 50 °C Reference temperature 22 °C Permissible relative humidity (non-condensing) 10 – 80 % Revision 01/2019 EN...

  • Page 116: Dimensions

    MicroSpotMonitor MSM Dimensions 427 +12 157,5 187,5 166,6 2x Ø11 4x Ø6,6 2x Ø6,6 316,6 +12 All dimensions in mm (general tolerance ISO 2768-v) Revision 01/2019 EN...

  • Page 117: Appendix

    1. Turn off the laser source. 2. Ensure that moving parts, e.g. robot arms, etc. are at a standstill and that they cannot be set in motion unintentionally. 3. Switch off the power supply of the MicroSpotMonitor MSM. NOTICE Damaging/destroying the optical components Contamination can damage or destroy the optical components.

  • Page 118: File "Laserds.ini" - An Example

    Out1=Port 1 Sensor Window PositionX=0 Mode=0 Sensor Window PositionY=0 Envi Window PositionX=0 Flag1=1111 Envi Window PositionY=0 Flag2=0 [Input] MSM Settings Window PositionX=0 Flag3=0 In0=Port 0 MSM Settings Window PositionY=0 [File] In1=Port 1 MSM Info Window PositionX=0 Default= In2=Port 2 MSM Info Window PositionY=0...

  • Page 119: Description Of The Mdf File Format

    MicroSpotMonitor MSM 21.3 Description of the MDF file format The MDF file format is a simple ASCII-format which includes the main data of a beam measurement – the spatial power density distribution. MDF stands for “mailable data format”. By means of this standardized format conversion problems between different evaluation programs are sup- posed to be reduced and a safe data transmission, e.g.

  • Page 120: Optical Components

    21.4 Optical components The MicroSpotMonitor MSM is a camera-based measuring system. Depending on the application, up to 7 different optical components can be in the beam path. The purpose and functioning of individual components is described in the following chapters.

  • Page 121: Measuring Objective

    MicroSpotMonitor MSM 21.4.1 Measuring objective The measuring objective is a lens system designed to reproduce a specific plane “above” the measuring objective onto the CCD sensor. “Above“ in this case, means that the plane is outside the MicroSpotMonitor MSM. This non-contact measurement offers the advantage that even very high power densities (GW/cm²) can be detected.
  • Page 122 4 mm, it should be reduced to 0.4 mm x 0.4 mm at a magnification of 10:1. The inlet aperture of the MicrosSpotMonitor MSM can easily be aligned with the optical axis of the laser beam within a range of 2 mm x 2 mm using an alignment tool (see chapter 7.2.2 on page 19). The path of movement of the x and y axis of 2 mm makes it possible to position the laser beam precisely on the CCD sensor.
  • Page 123 MicroSpotMonitor MSM Positioning the focused laser beam over the MicroSpotMonitor MSM The image characteristics of the measuring objective make it necessary to position the laser beam focus in a specific range over the measuring objective. Formula (1.1) shows, the further the focus is positioned over the measuring objective (afocus), the closer it is projected behind the measuring objective (a’focus).
  • Page 124 Measuring objektiv Prisms Fig. 21.6: Section of the beam path of the MicroSpotMonitor MSM The reflection is described with the Fresnel formulas. They describe the so-called reflection respectively transmission ratio of light at surface boundaries. (1.4) : Reflection ratio of vertically polarized light.
  • Page 125 45°, the angle of incidence at which the beam passes in the MicroSpotMonitor MSM. For this reason, the prisms are integrated in the MicroSpotMonitor MSM in such a way that the beam is diverted in all three spatial directions (see Fig. 21.6 on page 124). This ensures that always two of the three incidence planes of the prisms are perpendicular to each other and compensate the polarization effects.

  • Page 126: Fixed Filter And Filter Wheel

    However, the filters are only capable of handling 100 mW/cm², that‘s why they are not suitable to substitute for prisms. The maximum average power which the MicroSpotMonitor MSM can handle is 250 watts (500 W version with water cooling only). Be sure to use the aperture of the measuring objective when operating in this power range.

  • Page 127: Beam Path Extension (Bpe)

    The sensor area of the CCD sensor is 4.76 mm x 5.58 mm. Using a 10x measuring objec- tive means that in the standard case the MicroSpotMonitor MSM has to be positioned to approx. 0.5 mm in the x- and y-direction, for example in CCD mode. With the help of the adjustment lens, this range can be extended to 1.5 mm.

  • Page 128: Absorber

    • Frame Interline Transfer (FIT) The variant used in the MicrosSpotMonitor MSM, Interline Transfer, is widespread in industry and offers the ability to control exposure time. The CCD sensor used has a pixel pitch of 4.6 μm, at 1 024 × 1 360 photoactive pixels. The dynamic range of 55 dB is extended to more than 130 dB with the help of exposure time control.
  • Page 129 MicroSpotMonitor MSM can limit the amount of data to be transferred. Since the MicroSpotMonitor MSM measures laser beams with a diameter of a few μm, a sensor size of 4.76 mm x 5.58 mm is sufficiently large. Even if the laser beam is expanded with the help of the measuring objective, only a small part fo the chip is illuminated.
  • Page 130 A black measurement is done with the MicroSpotMonitor MSM before each measurement (even during trig- gered operation) to compensate for this effect. During a black measurement, registers are cleared, exposure time cycles, and the CCD is read without having made an image transfer.
  • Page 131 MicroSpotMonitor MSM Trigger One trigger mode is available to diagnose pulsated laser systems. The trigger signal comes from a photo diode below the fourth prism. The trigger threshold (signal strength at which a trigger signal is generated) can be set through a dialogue window in the software.

  • Page 132: Measuring Pulsed Irradiation

    21.5 Measuring pulsed irradiation The CCD sensor of the MicroSpotMonitor MSM has a dynamic of 55 dB. An integration time control has been implemented in order to expand this. The integration time can be freely chosen within the range of 12 µs to 186 ms.
  • Page 133 If this stops with the indication Waiting for Trigger, then the MicroSpotMonitor MSM is waiting for a trigger. Every measurement of the MicroSpotMonitor MSM consists of a dark measurement and a measurement with photo transfer.

  • Page 134: Measuring Configuration Selection

    MicroSpotMonitor MSM 21.5.1 Measuring configuration selection There are various measuring options to differentiate between: • Measuring a single plane or a complete caustic • Measuring a complete pulse or just a single section • Measuring with a fixed integration time or with integration time control •...
  • Page 135 MicroSpotMonitor MSM Pulse frequency Fig. 21.15: Percentage of change in the detected energy when exactly one pulse is left out, in correlation with the pulse frequency Tab. 21.1 on page 134 Shows the number of detected pulses during the maximum integration time (186 ms) and during an integration time of 1 ms for various pulse frequencies.
  • Page 136 The neutral-density filters, which can be inserted into the optical path, make it possible to always work within the desired range 1 - 4. Furthermore, as was mentioned in the initial consideration, the MicroSpotMonitor MSM is equipped with quite a few options for triggering. Combined with integration time control and delay time control, it is possible to take good measurements even in Case 1.
  • Page 137 MicroSpotMonitor MSM These four cases can generally be sorted into two groups. Case 1 and 2 must be measured in the triggered measuring mode. Case 4, however, is best measured in untriggered measuring mode cw. Case 3 should be avoided altogether by choosing a suitable filter.

  • Page 138: Examples For Triggered Measuring Mode

    Initiate a measurement. You now have 20 sec. to set off a trigger. As a result of the delay value of 0.95 ms and the fixed integration time of 100 µs, the MicroSpotMonitor MSM detects the second laser pulse after setting off the trigger. Example 2:...

  • Page 139: Summary

    MicroSpotMonitor MSM 21.5.4 Summary If the laser is pulsing at a high frequency (> 500 Hz) or if the pulses last a long time (> 1ms), it is best to mea- sure with the Optim. option. This makes it possible to vary or optimize the integration time during a caustic measurement.

  • Page 140: Basis Of Laser Beam Diagnosis

    MicroSpotMonitor MSM Basis of laser beam diagnosis 22.1 Laser beam parameter Raw beam diameter d σ σ Divergence angle θ Focal length f θ Focus diameter d σ z-axis z-axis Fig. 22.1: Sketch for the definition of beam parameters Revision 01/2019 EN...

  • Page 141: Rotationally Symmetric Beams

    MicroSpotMonitor MSM 22.1.1 Rotationally symmetric beams According to ISO 11145 as well as ISO 11146 three beam parameters are necessary for the characterization of a rotationally symmetric beam: • the z-position of the beam waist (focus) z • the diameter of the beam waist d σF...

  • Page 142: Non Rotationally Symmetric Beams

    MicroSpotMonitor MSM 22.1.2 Non rotationally symmetric beams In order to describe non rotationally symmetric beams, the following parameters are required: • the z-position of the beam waist (focus) z and z • the diameter of the beam waist d and d σ0x...

  • Page 143: Calculation Of Beam Data

    MicroSpotMonitor MSM 22.2 Calculation of beam data For the calculation of the beam data not only the algorithms for the 2. moment method are implemented as demanded by the ISO standard 11145 but also the 86 % method which is widely-spread within the industry.

  • Page 144: Determination Of The Beam Position

    MicroSpotMonitor MSM 22.2.2 Determination of the beam position The beam position is determined by means of the 1. moment method. This means the moment of inertia of the power density distribution (E(x, y, z)) is determined. (1.5) As mentioned at the beginning of the chapter, there are two possibilities how to determine the beam radius after the determination of the beam position.

  • Page 145: Radius Determination With The Method Of The 86 % Power Inclusion

    MicroSpotMonitor MSM 22.2.4 Radius determination with the method of the 86 % power inclusion The first step is the determination of the volume of the power density distribution. It is proportional to the total power. The addition of all power density values and their multiplication with the pixel dimensions result in the volume and therefore the total power.

  • Page 146: Further Radius Definitions (Option)

    6. Power inclusion method with a freely definable 2 power value 2. Moments Power inclusion Knife edge method Slit method Gaussfit method 1/e²-power density Fig. 22.5: Schematic illustration of the beam radius definitions that are offered optionally for the PRIMES LaserDiagnosticsSoftware LDS Revision 01/2019 EN...

  • Page 147: Measurement Errors

    MicroSpotMonitor MSM 22.3 Measurement errors Regardless of the measuring principle, there are many sources of errors in determining beam radius. • Determination of the zero level • Finite size of the measurement window • Resolution in x and y directions •...

  • Page 148: Errors From Incorrect Measurement Window Size

    MicroSpotMonitor MSM 22.3.3 Errors from incorrect measurement window size The entire laser beam must be within the measurement window for correct normalization of the volume of the measured distribution. Since the intensity distribution, in principle, extends infinitely, a fraction of the beam power is always outside the measuring range.

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