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Primes LQM series Operating Manual

Laser quality monitor
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Operating Manual
Translation of the original instructions
LaserQualityMonitor LQM
LQM 20, LQM 200/500, HP-LQM II (10 kW)
LaserDiagnosticsSoftware LDS
Revision 02/2018 EN

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  • Page 1 Operating Manual Translation of the original instructions LaserQualityMonitor LQM LQM 20, LQM 200/500, HP-LQM II (10 kW) LaserDiagnosticsSoftware LDS Revision 02/2018 EN...
  • Page 3 IMPORTANT! READ CAREFULLY BEFORE USE. KEEP FOR FUTURE USE.

  • Page 4: Table Of Contents

    LaserQualityMonitor LQM Table of contents Basic safety instructions Symbol explanations About this operating manual Conditions at the installation site Introduction Laser beam measurement .......................13 System description .........................14 Measuring principle .........................14 Short overview installation .......................16 Transport Installation Preparation and mounting position ..................17 Manually aligning the LaserQualityMonitor LQM...............18 7.2.1 Alignment tools ......................18...
  • Page 5 LaserQualityMonitor LQM Installation and configuration of the LaserDiagnosticsSoftware LDS 11.1 System requirements ......................33 11.2 Installing the software ......................33 11.3 Ethernet configuration ......................34 11.3.1 Enter IP address .......................34 11.3.2 Establishing a connection to PC (menu Communication > Free Communication) ..35 11.3.3 Changing the standard IP address of the device (menu Communication >...
  • Page 6 LaserQualityMonitor LQM 12.5.10 Variable contour lines (menu Presentation > Variable Contour Lines) .....78 12.5.11 Graphical review (menu Presentation > Graphical Review) ........80 12.5.12 Systemstate (menu Presentation > Systemstate) ...........80 12.5.13 Evalution parameter view (menu Presentation > Evalution Parameter View) ..81 12.5.14 Evaluate document (menu Presentation >...
  • Page 7 LaserQualityMonitor LQM Appendix 20.1 Install a fiber adapter ......................106 20.2 Changing the factory setting on the LQM UV .................107 20.3 HighYAG collimation module ....................109 20.3.1 Key data for the cooling system for the HighYAG collimation module ......110 20.3.2 Schematic of the cooling system for the HighYAG collimation module .....111 20.3.3 Schematic of the cooling circuit for the HP-LQM II ..........111 20.3.4...
  • 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

    LaserQualityMonitor LQM Basic safety instructions Intended use The LaserQualityMonitor LQM is exclusively intended for measurements which are carried out in or nearby the optical path of high power lasers. Please mind and adhere to the specifications and limit values given in chapter 18 „Technical data“...
  • Page 10 LaserQualityMonitor LQM • Ensure that the device is mounted securely to prevent any movement of the device relative to the beam axis and thus reduce the risk of scattered radiation. This in the only way to ensure optimum performance during the measurement. Employing qualified personnel The device may only be operated by qualified personnel.

  • Page 11: Symbol Explanations

    LaserQualityMonitor LQM 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

    LaserQualityMonitor LQM About this operating manual This documentation describes how to work with the LaserQualityMonitor LQM and operate it with the Laser- DiagnosticsSoftware LDS. 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. Since the user software is continuously being developed further, the supplied data medium may have a different version number.

  • Page 13: Introduction

    This is where PRIMES beam diagnostics devices for measuring beam quality, focusability and laser power come in. Process monitoring in production with laser beam diagnostics devices by PRIMES enables consis- tent quality assurance and allows the timely detection and elimination of malfunctions of laser beams.

  • Page 14: System Description

    LaserQualityMonitor LQM System description The LaserQualityMonitor LQM is used to measure the beam properties of a beam source either by measuring the open beam across several meters or with a fiber placed in a fiber holder or collimator. Cw lasers can be measured and pulsed lasers can also be measured using an internal trigger. The electronics and all optical components shown are installed in the basic device.
  • Page 15 LaserQualityMonitor LQM The following laser sources can be measured: • All cw and pulsed laser sources in the wave length area of 340-360 nm/515-545 nm/1030-1090 nm with medium power from approx. 1 mW up to multikilowatt ranges with an M² ranging from 1 to approx. 50. •...

  • Page 16: Short Overview Installation

    LaserQualityMonitor LQM Short overview installation Taking safety precautions Chapter 1 on page 9 Prepare installation (only during open beam measurement) Chapter 7 on page 17 • Make preparations • Set the installation position • Align the device manually Installing the water-cooling Chapter 8 on page 24 (HP-LQM II and LQM 500 W water-cooled version only) •...

  • Page 17: Transport

    X Handle the measuring device carefully when transporting or installing it. X To avoid contamination, cover the apertures with the provided lid or optical tape. X Only transport the device in the original PRIMES transport box. CAUTION Damage/destruction of the device caused by leaking or freezing cooling water Leaking cooling water can damage the device.

  • Page 18: Manually Aligning The Laserqualitymonitor Lqm

    LaserQualityMonitor LQM Manually aligning the LaserQualityMonitor LQM For an open beam measurement, the LaserQualityMonitor LQM must be aligned with the laser beam: 1. Align the LaserQualityMonitor LQM manually with a pilot laser and the alignment tool. • The LaserQualityMonitor LQM is properly aligned when the pilot beam is centered through the holes in the alignment tool.

  • Page 19: Manual Alignment Of The Basic Device

    LaserQualityMonitor LQM 7.2.2 Manual alignment of the basic device In order to align the laser beam with the basic device, the alignment tool is mounted with a mounting plate and two knurled screws included in the scope of delivery (see Fig. 7.2 on page 19). Fig.

  • Page 20: Manual Alignment Of The 2

    LaserQualityMonitor LQM 7.2.4 Manual alignment of the 2 attenuator module To align the laser beam with the 2 attenuator module, the alignment tool is mounted with a mounting plate and two knurled screws included in the scope of delivery (see Fig. 7.5 on page 20). Fig.

  • Page 21: Install The Laserqualitymonitor Lqm

    LaserQualityMonitor LQM Install the LaserQualityMonitor LQM 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: Install The Lqm 200/500 With Bottom Plate

    LaserQualityMonitor LQM 7.3.2 Install the LQM 200/500 with bottom plate Fig. 7.7: Fastening threaded holes LQM 200/500 with bottom plate For the connection of a customer specific part, there are six threads M6 in the bottom plate. We recommend screws of the strength class 8.8. 6 threaded holes M6 Revision 02/2018 EN...

  • Page 23: Install The Hp-Lqm Ii With Bottom Plate

    LaserQualityMonitor LQM 7.3.3 Install the HP-LQM II with bottom plate Fig. 7.8: Fastening bores and alignment threads HP-LQM II with bottom plate 2 mounting holes Ø 6.6 mm 4 threaded holes M8 for the alignment Revision 02/2018 EN...

  • Page 24: Connect Cooling Circuit (Hp-Lqm Ii And 500 W Water Cooled Version Only)

    LaserQualityMonitor LQM Connect cooling circuit (HP-LQM II and 500 W water cooled 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 25: Humidity

    LaserQualityMonitor LQM 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 25). NOTICE Damage/Destruction of the device due to condensing water Condensation water inside of the objective will lead to damage.

  • Page 26: Water Connections And Water Flow Rate

    LaserQualityMonitor LQM Water connections and water flow rate 8.4.1 HP-LQM II (10 kW) HP-LQM II (10 kW) Connection diameter Recommended flow rate Minimum flow rate PE hoses 12 mm 7 l/min – 8 l/min (1l/(min · kW) Not lower than 4.5 l/min 8.4.2 LQM (500 W) LQM II (500 W) Connection diameter Recommended flow rate...

  • Page 27: Electrical Connections

    The LaserQualityMonitor LQM serves as a dongle for the software on the computer in order to en- able certain software functions. Connections On/Off switch Input Output Ethernet RS485 PRIMES bus external trigger internal trigger D-Sub socket 9 pole (Power supply connection) Fig. 9.1: Connections...

  • Page 28: Pin Assignment

    LaserQualityMonitor LQM 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) Function +5 V (Trigger signal) Fig.

  • Page 29: Safety Facilities

    LaserQualityMonitor LQM Safety facilities 9.3.1 Temperature control The 1 and 2 attenuator module as well as the absorber and basic device each have a temperature switch. If the temperature exceeds 75 °C in one of these components, the LaserQualityMonitor LQM detects it and a warning message is issued in the LaserDiagnosticsSoftware LDS.

  • Page 30: External Safety Circuit

    LaserQualityMonitor LQM 9.3.2 External safety circuit (HP-LQM II with 2 attenuator only) An external safety switch (laser interlock) is integrated into the HP-LQM II with 2 attenuator module. This switch must be connected to the laser safety circuit so that it can turn off the laser in case of error. NOTICE Damage/Destruction of the device If the safety circuit is not connected, the device may be damaged by overheating in the...

  • Page 31: 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 32: Status Leds

    LaserQualityMonitor LQM Status LEDs The device has two status LEDs. Description Color Meaning Power green The power supply is switched on Measuring yellow A measurement is running Tab. 10.1: Description of the status LEDs on the LaserQualityMonitor LQM Power supply Measuring mode Tab.

  • Page 33: Installation And Configuration Of The Laserdiagnosticssoftware Lds

    LaserQualityMonitor LQM 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 34: Ethernet Configuration

    LaserQualityMonitor LQM 11.3 Ethernet configuration 11.3.1 Enter IP address The LaserQualityMonitor LQM has a fixed IP address that is specified on the type plate: • If the LaserQualityMonitor LQM is connected directly to the PC, enter the fixed IP address in the menu Communication >...

  • Page 35: 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 36: Changing The Standard Ip Address Of The Device

    LaserQualityMonitor LQM 11.3.3 Changing the standard IP address of the device (menu Communication > Free Communica- tion) If the fixed IP address of the LaserQualityMonitor LQM conflicts with another device bearing the same IP ad- dress on the network, the fixed IP address of the LaserQualityMonitor LQM can be changed. NOTICE Device malfunction due to erroneous entries While changing the IP address, it is possible that another EE cell might be overwritten by a...
  • Page 37 LaserQualityMonitor LQM 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 38). 2. Open the dialogue window Communication > Free Communication. 3. Choose in the field “Mode” TCP (the option “Second IP” must not be activated!). 4.

  • Page 38: Description Of The Laserdiagnosticssoftware Lds

    LaserQualityMonitor LQM 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 39 LaserQualityMonitor LQM 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 40: The Menu Bar

    LaserQualityMonitor LQM 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 02/2018 EN...

  • Page 41: The Toolbar

    LaserQualityMonitor LQM 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 2 - Open an existing data record 3 - Save the current data record 4 - Open the isometric view of the selected data record...

  • Page 42: Menu Overview

    LaserQualityMonitor LQM 12.1.3 Menu overview File Opens a new file for the measuring data Open Opens a measuring file with the extensions “.foc” or “.mdf” Close Closes the file selected in the toolbar Close all Closes all files opened Save Saves the current file in foc- or mdf format Save as Opens the menu for the storage of the files selected in the toolbar.
  • Page 43 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 44 LaserQualityMonitor LQM 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 45: File

    LaserQualityMonitor LQM 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. 12.2.3 Close/Close all (menu File >...

  • Page 46: Load Measurement Preferences (Menu File > Load Measurement Preferences)

    LaserQualityMonitor LQM 12.2.7 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 LaserQualityMonitor LQM is “.ptx”. 12.2.8 Save measurement preferences (menu File > Save measurement preferences) The current measurement settings are stored (.ptx-file).

  • Page 47: Edit

    LaserQualityMonitor LQM 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. 12.3.2 Clear plane (menu Edit >...

  • Page 48: Measurement

    LaserQualityMonitor LQM 12.4 Measurement 12.4.1 Measuring environment (menu Measurement > Environment) A description of the settings for the LaserQualityMonitor LQM can be found in chapter 13.4.2 on page 97 Fig. 12.9: Dialogue window Measuring Environment In the dialogue window Measuring Environment data such as the laser type, information on the collimator etc.

  • Page 49: Sensor Parameters (Menu Measurement > Sensor Parameter)

    LaserQualityMonitor LQM 12.4.2 Sensor parameters (menu Measurement > Sensor parameter) Fig. 12.10: Dialogue window Sensor parameters Mechanical Limits Not relevant for LaserQualityMonitor LQM. 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.

  • Page 50: Beam Find Settings

    LaserQualityMonitor LQM 12.4.3 Beam find settings (menu Measurement > BeamFind Settings: Beamfind Here, the parameters for the automated beam find are set. The general presetting is helpful for many stan- dard applications. Fig. 12.11: Dialogue window BeamFind Settings: Beamfind The Beam find parameters can be set as follows: Pixel X, Pixel Y The selection of the spatial resolution.

  • Page 51: Ccd Info (Menu Measurement > Ccd Info)

    LaserQualityMonitor LQM 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. If obvious default values (1:1) are shown instead of the actual magnification, then please check the mounting of the measurement objective.

  • Page 52: Ccd Settings (Menu Measurement > Ccd Settings)

    LaserQualityMonitor LQM 12.4.5 CCD settings (menu Measurement > CCD Settings) A description of the settings for the LaserQualityMonitor LQM can be found in chapter 13.4.1 on page 96. Fig. 12.13: 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 53 LaserQualityMonitor LQM 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. Filter wheel Not relevant for the LaserQualityMonitor LQM.
  • Page 54 LaserQualityMonitor LQM General sequence control • Empty the CCD register • Aim for the holding point in line a (line in which photo transfer takes place); if the trigger is set off during sub-pulse, repeat line a (-> NLC = NoLineChange) •...

  • Page 55: Lqm Adjustment (Menu Measurement > Lqm Adjustment)

    LaserQualityMonitor LQM 12.4.6 LQM adjustment (menu Measurement > LQM Adjustment) A description of the settings for the LaserQualityMonitor LQM can be found in chapter 13.3 on page 94. Fig. 12.15: Dialogue window LQM-Adjustment 12.4.7 Power measurement (menu Measurement > Power Measurement) Not relevant for the LaserQualityMonitor LQM.

  • Page 56: Single (Menu Measurement > Single)

    LaserQualityMonitor LQM 12.4.8 Single (menu Measurement > Single) Fig. 12.16: Dialogue window Measurement settings Revision 02/2018 EN...
  • Page 57 LaserQualityMonitor LQM Single Starts a measurement in the chosen plane Monitor Starts repeated measurements in the chosen plane automatically Video Mode Repeated output of raw data in the chosen plane Start Starts a measurement in the currently chosen plane Stop Finishes the measurement in the currently chosen plane Reset The measuring device is reset...
  • Page 58 LaserQualityMonitor LQM With the dialogue window Measurement settings either single measurements or repeated measurements can be carried out. The measuring window position can be set either manually or automatically. 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, diffusion) and lighting time adjust- ments are performed every time a new measurement is carried out.
  • Page 59 LaserQualityMonitor LQM Size of the measuring window During a manual beam search, you can define the location and size of the measuring window yourself in the dropdown menu within the mechanical limits. You can change the location of the measuring window by clicking on it and dragging the frame with the mouse.

  • Page 60: Caustic Measurement (Menu Measurement > Caustic)

    LaserQualityMonitor LQM 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 61 LaserQualityMonitor LQM Automatic caustic measurement (menu Measurement > Caustic > Automatic) Fig. 12.17: 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 62 LaserQualityMonitor LQM Manual caustic measurement as time series (menu Measurement > Caustic > Manually adjusted) The manual caustic measurement consists of a series of individual measurements at various z-positions, with the results being stored in their own planes. For the manual caustic measurement the following steps are necessary: 1.

  • Page 63: Start Adjust Mode (Menu Messung > Start Adjust Mode)

    LaserQualityMonitor LQM 12.4.10 Start adjust mode (menu Messung > Start Adjust mode) Not relevant for LaserQualityMonitor LQM. 12.4.11 Option (advanced user only) (menu Measurement > Option) Fig. 12.19: 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.
  • Page 64 LaserQualityMonitor LQM substantial the RMS noise is and the errors in the zero level determination of a measuring plane, the optimal fill factor value to produce the best possible mathematical result will be different. 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 65: Presentation

    LaserQualityMonitor LQM 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 66: False Colors (Menu Presentation > False Colors)

    LaserQualityMonitor LQM 12.5.1 False colors (menu Presentation > False colors) Here, a false color presentation of the measured power density distribution is generated. Fig. 12.21: 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 67: False Colors (Filtered) (Menu Presentation > False Colors (Filtered))

    LaserQualityMonitor LQM 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 68: Isometry 3D (Menu Presentation > Isometry 3D)

    LaserQualityMonitor LQM 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 69: Review 86 % Or 2Nd Moment (Menu Presentation > Review (86%)/(Sec. Moments))

    LaserQualityMonitor LQM 12.5.5 Review 86 % or 2nd Moment (menu Presentation > Review (86%)/(Sec. Moments)) For the radius definition there are two basic determination possibilities: • Determination of the beam radii according to the 86% - power definition, (see chapter 21.2.4 on page 130). •...

  • Page 70: Caustic (Menu Presentation > Caustic)

    LaserQualityMonitor LQM 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. 12.25 on page 70 shows the measured beam parameter either on the basis of the 86%-radii or the 2 Moment evaluation according to ISO 11146.
  • Page 71 LaserQualityMonitor LQM 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. Focus radius The focus radius is the smallest beam radius in the caustic.
  • Page 72 LaserQualityMonitor LQM Advanced (menu Presentation > Caustic > Advanced) Fig. 12.26: Result window Results X,Y (2. Moment) For the examination of asymmetric beams the dimensions of the main axes of the beam can be determined. On the basis of these values the program also calculates direction dependent beam propagation factors as well as beam position values.
  • Page 73 LaserQualityMonitor LQM Raw beam (menu Presentation > Caustic > Raw Beam) Fig. 12.27: Result window Raw Beam When measuring according to ISO 11146, the raw beam parameters can be recalculated from the internal caustic. The numeric values are also graphically displayed in the results window “raw beam”. Revision 02/2018 EN...
  • Page 74 LaserQualityMonitor LQM 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 75: Raw Beam (Menu Presentation > Raw-Beam)

    LaserQualityMonitor LQM If all criteria are fulfilled, the measuring results have a high reliability. The absolute accuracy can not be stated from the standard deviation from the fits as all the systematic measuring errors as well as the accuracy of the calibration are additionally taken into account when it comes to the absolute error.

  • Page 76: Symmetry Check (Menu Presentation > Symmetrycheck)

    LaserQualityMonitor LQM 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 77: Fixed Contour Lines (Menu Presentation > Fixed Contour Lines)

    LaserQualityMonitor LQM Fig. 12.32: 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 78: Variable Contour Lines (Menu Presentation > Variable Contour Lines)

    LaserQualityMonitor LQM 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 79 LaserQualityMonitor LQM 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. 12.35: Display window CCD Info Revision 02/2018 EN...

  • Page 80: Graphical Review (Menu Presentation > Graphical Review)

    LaserQualityMonitor LQM 12.5.11 Graphical review (menu Presentation > Graphical Review) The display window Graphical review offers many possibilities to display the measurement values of the single measurement planes. In total this window can present 20 different graphs. The possible selections for the x- and y-coordinates are shown in the Tab.

  • Page 81: 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 82: Evaluate Document (Menu Presentation > Evaluate Doc)

    LaserQualityMonitor LQM 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. Under the menu point Presentation > Evaluate doc of the LDS, the following dialog window is opened: Fig.
  • Page 83 LaserQualityMonitor LQM Evaluation Criteria: Only if all single evaluations are ok, the overall evaluation is displayed in green in the traffic light symbol. Fig. 12.40: 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 84: Color Tables (Menu Presentation > Color Tables)

    LaserQualityMonitor LQM 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 85: Position (Menu Presentation > Position)

    LaserQualityMonitor LQM 12.5.17 Position (menu Presentation > Position) This menu can be used to move the device to its parked position. Fig. 12.44: 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 86 LaserQualityMonitor LQM Fig. 12.46: 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). 3.

  • Page 87: 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 35). Fig. 12.47: Dialoque window Kommunikation >...

  • Page 88: 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 89: Script

    89. 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 02/2018 EN...

  • Page 90: Measurement

    LaserQualityMonitor LQM Measurement 13.1 Safety instructions DANGER Serious eye or skin injury due to laser radiation During the measurement the laser beam is guided on the device, which causes scattered or directed reflection of the laser beam (laser class 4). The LaserQualityMonitor LQM cannot be operated in any of the available configurations without taking the following precautions.

  • Page 91: Selection And Change Of The Measuring Objective And The Neutral-Density Filter

    LaserQualityMonitor LQM 13.2 Selection and change of the measuring objective and the neutral-density filter 13.2.1 Selection of the measuring objective The selection of the correct measuring objective is of vital importance for the measurement quality. The limi- tation of use for the 1:1 or 5:1 measuring objectives is shown in the diagram Tab. 13.1 on page 91. M²...

  • Page 92: Exchanging The Measuring Objective Or The Neutral-Density Filter

    LaserQualityMonitor LQM 13.2.2 Exchanging the measuring objective or the neutral-density filter For changing a measuring objective or the neutral-density filter, the plate on the side of the LaserQualityMoni- tor LQM has to be opened: 1. Turn off the laser. 2. Press down two locking bolts (see Fig. 13.1 on page 92): •...

  • Page 93: Neutral-Density Filter

    LaserQualityMonitor LQM NOTICE Damage of the device Contamination in the device can damage the optical components. X Seal unused slots with the provided dummy inserts. Fig. 13.2: Dummy insert DANGER Serious eye or skin injury due to laser radiation If the device is operated after the housing plate on the side has been removed, reflected beams (laser class 4) may leave the device in measuring mode.

  • Page 94: Align The Laser Beam With The Laserdiagnosticssoftware Lds

    LaserQualityMonitor LQM 13.3 Align the laser beam with the LaserDiagnosticsSoftware LDS After manually aligning the beam with the alignment tool, you can check the accuracy with a function of the LaserDiagnosticsSoftware LDS. 13.3.1 Align the laser beam at position z2 in the measuring window 1.

  • Page 95: Display The Misalignment Angle Of The Laser Beam Via Position Z1 And Z3

    LaserQualityMonitor LQM 13.3.2 Display the misalignment angle of the laser beam via Position z1 and z3 1. Please open the dialogue window Measurement > LQM Adjustment. 2. Click on the Start Adjustment button. 3. Check if the beam has an angular deviation (see Fig. 13.5 on page 95): •...

  • Page 96: Enter The Measurement Settings Into The Laserdiagnosticssoftware Lds

    13.4 Enter the measurement settings into the LaserDiagnosticsSoftware LDS Due to the fact that the LaserDiagnosticsSoftware LDS is designed multifunctionally for all PRIMES devices, a few device-specific settings have to be made before a measurement. Moreover, the system and beam geometry provided by the customer are to be considered.

  • Page 97: Measuring Environment (Menu Measurement > Environment)

    LaserQualityMonitor LQM 13.4.2 Measuring environment (menu Measurement > Environment) 1. Please open the dialogue window Measurement > Environment 2. Type in the field “Wavelength” the actual Wavelength. • The current wavelength is needed in order to calculate the M² value. The required distance is the distance between laser source/collimator to the aperture of the basic LaserQualityMonitor LQM.

  • Page 98: Flowchart Of A Measurement

    LaserQualityMonitor LQM 13.5 Flowchart of a measurement 13.5.1 Align the laser manually and with the LaserDiagnosticsSoftware LDS 1. Choose the correct measuring objective according to chapter 13.2 on page 91 . 2. Reduce the laser power. 3. Align the LaserQualityMonitor LQM according to chapter 7.2 on page 18 manually to the laser beam. 4.

  • Page 99: Perform Caustic Measurement

    LaserQualityMonitor LQM 13.5.3 Perform caustic measurement Start Open new document Enter caustic limits (± 3 z Enter number of planes (21 recommended) Increase Decrease Start measurement z-range z-range z-ange number of (>4*z planes û (<3/z Review û stated as Start measurement •...

  • Page 100: Maintenance And Service

    “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 101: Declaration Of Conformity

    LaserQualityMonitor LQM Declaration of conformity Revision 02/2018 EN...

  • Page 102: Technical Data

    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 Interface Ethernet Dimensions and weight Dimensions (L x W x H)

  • Page 103: Dimensions

    LaserQualityMonitor LQM Dimensions 19.1 LaserQualityMonitor LQM 20 basic module View A All dimensions in mm (general tolerance ISO 2768-v) Revision 02/2018 EN...

  • Page 104: Laserqualitymonitor Lqm 200/500 (Without Bottom Plate)

    LaserQualityMonitor LQM 19.2 LaserQualityMonitor LQM 200/500 (without bottom plate) 288,9 403,3 Ansicht A 180,4 All dimensions in mm (general tolerance ISO 2768-v) Revision 02/2018 EN...

  • Page 105: Highpower-Laserqualitymonitor Hp-Lqm Ii With Optional Fiber Adapter

    LaserQualityMonitor LQM 19.3 HighPower-LaserQualityMonitor HP-LQM II with optional fiber adapter 314.8 All dimensions in mm (general tolerance ISO 2768-v) Revision 02/2018 EN...

  • Page 106: Appendix

    LaserQualityMonitor LQM Appendix 20.1 Install a fiber adapter DANGER Serious eye or skin injury due to laser radiation During the measurement the laser beam is guided on the device, which causes scattered or directed reflection of the laser beam (laser class 4). The LaserQualityMonitor LQM cannot be operated in any of the available configurations without taking the following precautions.

  • Page 107: Changing The Factory Setting On The Lqm Uv

    X Changing the factory settings for positioning range is only allowed by well trained and expe- rienced personnel. In case of any doubt, please contact PRIMES service! The length of the internal beam path is influenced by the movement of prisms inside the device. Depending on the optical properties and the pulse parameters of a laser source, damages to the internal optical ele- ments can occur.
  • Page 108 LaserQualityMonitor LQM NOTICE Component susceptible to electrostatic discharge The circuit board could be destroyed by electrostatic discharge. X Before reconnecting the jumper, put on an ESD armband. Before switching the jumpers, put on an ESD armband. On the now visible board you can find a jumper which has Position Shortened positioning range to be brought into the desired...

  • Page 109: Highyag Collimation Module

    X Protect yourself from laser radiation by separating protective devices (e.g. by using appro- priate shielding). As an option PRIMES offers a 67 mm collimation module which can be mounted directly to the HP attenua- tor of the HighPower-LaserQualityMonitor HP-LQM II.

  • Page 110: Key Data For The Cooling System For The Highyag Collimation Module

    LaserQualityMonitor LQM 20.3.1 Key data for the cooling system for the HighYAG collimation module Specifications Max. cooling water pressure 6 bar Min. cooling water flow rate 2 l/min Cooling water quality Deionized water with corrosion inhibitor Filter mesh < 100 µm Tab. 20.2: Specifications of the cooling system From fiber...

  • Page 111: Schematic Of The Cooling System For The Highyag Collimation Module

    LaserQualityMonitor LQM 20.3.2 Schematic of the cooling system for the HighYAG collimation module Important: The collimator cannot be connected to the cooling circuit of the HP-LQM II, but rather to the cooling circuit of the fiber. Fiber Adapter Collimator Fig. 20.3: Scheme cooling curcuit collimator 20.3.3 Schematic of the cooling circuit for the HP-LQM II...

  • Page 112: Remove Highyag Collimation Module

    LaserQualityMonitor LQM 20.3.4 Remove HighYAG collimation module Necessary tools: • Allen key, a. f. 2.5 mm • Allen key, a. f. 3 mm NOTICE Damage/Destruction of optical components A contaminated focussing optic can heat up, change optical properties and potentially be damaged. X To avoid contamination, only perform work in a clean environment.

  • Page 113: Choosing The Measuring Objective With A Highyag Collimation Module Installed

    LaserQualityMonitor LQM 20.3.5 Choosing the measuring objective with a HighYAG collimation module installed Example 1: λ = 1030 nm M² = 12 = 100 µm fibercore = focal length ⋅ fibercore fibercore = 299 µm To enable a measurement within ±3 z the estimated number of illuminated pixels at the focus should be less than 350.
  • Page 114 LaserQualityMonitor LQM M² Fig. 20.6: Range of application of the LQM objectives MOB 1:1 -->  MOB 5:1 -->  The two examples demonstrates the calculation of beam parameters based on a given collimator focal length. The calculation can also be done using other collimator focal lengths. Revision 02/2018 EN...

  • Page 115: Optical Path In The Hp-Lqm Ii (With Collimator)

    LaserQualityMonitor LQM 20.4 Optical path in the HP-LQM II (with collimator) f = 67 Attenuator Beamsplitter Fiber Collimator Beam entrance LQM Basic module LQM 0 to 140 z = 280 z = 0 Adjustable prism 5:1 optics Attenuator 1:1 optics Fig.

  • Page 116: Description Of The Mdf File Format

    LaserQualityMonitor LQM 20.5 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 117: Measuring Pulsed Irradiation

    LaserQualityMonitor LQM 20.6 Measuring pulsed irradiation The CCD sensor of the LaserQualityMonitor LQM 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 118 LaserQualityMonitor LQM Trigger Delay time Sequential-control camera Level Integration time 0 ... 4096 Fig. 20.9: Options for affecting the sequence control of the CCD sensor Fig. 20.9 on page 118 Shows that the trigger, together with the adjustable delay and integration time, inter- feres with the sequence control of the CCD sensor.

  • Page 119: Measuring Configuration Selection

    LaserQualityMonitor LQM 20.6.1 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 120 LaserQualityMonitor LQM Pulse frequency Fig. 20.10: Percentage of change in the detected energy when exactly one pulse is left out, in correlation with the pulse frequency Tab. 20.3 on page 119 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 121 LaserQualityMonitor LQM A total of four states can always be differentiated on the way from low to high pulse frequencies or from short to long integration times. This is demonstrated by the following example for measuring pulsed irradiation dur- ing untriggered operation. I in W/cm²...
  • Page 122 LaserQualityMonitor LQM 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. The below diagram in Fig.

  • Page 123: Examples For Triggered Measuring Mode

    LaserQualityMonitor LQM 20.6.3 Examples for triggered measuring mode Example 1: Pulse duration 50 ns Pulse frequency 1 kHz LaserQualityMonitor LQM Settings: Delay: Integration duration: 0.1 ms Trigger channel: External trigger Depending on how precisely you are able to set off the trigger, you can also extend or shorten the integration time.

  • Page 124: Summary

    LaserQualityMonitor LQM 20.6.4 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 125: Basis Of Laser Beam Diagnosis

    LaserQualityMonitor LQM Basis of laser beam diagnosis 21.1 Laser beam parameter Focal length f Magnification of the focus range The index σ indicates a calculation according to the 2 moment method. Calculations based on a percentaged power- or energy confinement have the index u% with: 0 <...

  • Page 126: Rotationally Symmetric Beams

    LaserQualityMonitor LQM 21.1.1 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 the far field divergence angle Θ...

  • Page 127: Non Rotationally Symmetric Beams

    LaserQualityMonitor LQM 21.1.2 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 σ0y the far field divergence angle Θ...

  • Page 128: Calculation Of Beam Data

    LaserQualityMonitor LQM 21.2 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. For the Gaussian TEM00-mode both methods offer similar results whereas in case of the majority of other laser beams the 2 moment method calculates bigger beam diameters than the 86 % method.

  • Page 129: Determination Of The Beam Position

    LaserQualityMonitor LQM 21.2.2 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 130: Radius Determination With The Method Of The 86 % Power Inclusion

    LaserQualityMonitor LQM 21.2.4 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 131: Error In Determining Zero Level

    LaserQualityMonitor LQM 21.2.6 Error in determining zero level Calculation of the beam waist radius is very strongly dependent on changes in the zero level. It doesn’t mat- ter if the 86% or 2 moment method is used. = 0.86 (V = Fill factor ∆r+ ∆r-...

  • Page 132: Errors From Incorrect Measurement Window Size

    LaserQualityMonitor LQM 21.2.8 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.

  • Page 133: Formula And Algorithms For Raw Beam Back Calculation Of The Lqm

    LaserQualityMonitor LQM 21.3 Formula and algorithms for raw beam back calculation of the LQM To calculate the raw parameters from the measured beam parameters of the focus, the formula given in ISO11146 is used. Index F describes the beam parameters of the focus. Fig.
  • Page 134 LaserQualityMonitor LQM Revision 02/2018 EN...

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Lqm 20Lqm 200Lqm 500Hp-lqm ii

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