Table of Contents
Subscribe to Our Youtube Channel
Related Manuals for TEM PhaseLock
Summary of Contents for TEM PhaseLock
- Page 1 PhaseLockManual TEM Messtechnik GmbH December 8, 2022 TEM Messtechnik GmbH Grosser Hillen 38 D-30559 Hannover Tel: +49 (0)511 51 08 96 -31 Fax: +49 (0)511 51 08 96 -38 E-mail: mailto:info@TEM-messtechnik.de URL: http://www.TEM-Messtechnik.de...
-
Page 3: Table Of Contents
PhaseLockManual Contents 1 Product description 1.1 General ......... 1.2 Functional components . - Page 4 PhaseLockManual 8 Detailed description 8.1 Frequency Mixer ........37 8.2 Signal monitor .
-
Page 5: Product Description
Product description General PhaseLock is a general electronic device for the set-up of a phase-locked loop (PLL). It synchronizes the pulse train of a laser with an electronic reference clock or with another laser (see figure 1). PhaseLock comprises a phase comparator unit for two periodic RF (radio frequency) input signals and two PID controllers as well as a logic section that eases the locking and re-locking. - Page 6 PhaseLockManual The PhaseLock block diagram is shown in Figures 2 and 3, which gives a first overview on the function blocks, the relation of the function blocks to each other, the switching options, as well as the inputs and outputs of PhaseLock.
-
Page 7: Safety Instructions
Figure 3: Schematic block diagram of PhaseLock digital device without MCPC option Safety Instructions Before operating the PhaseLock, please read this user guide carefully in order to avoid any damage of the device or connected equipment as well as any injury to persons. - Page 8 Please keep this manual within easy reach to refer to if needed. Give your PhaseLock to third parties only with this manual.
-
Page 9: Scope Of Delivery
ˆ USB memory stick containing PC software ˆ This manual Components for standard (MCPC) configuration The following parts come with the PhaseLock electronics for use with pulsed lasers (standard appli- cation). They are omitted for optical phase stabilization of cw lasers. ˆ RF mixer unit ˆ... -
Page 10: Brief Description Of The Control Elements
PhaseLockManual Brief description of the control elements Front panel elements PhaseLock digital trigger out monitor 1 monitor 2 output A output B input prgm reset Figure 4: Front panel elements Description 4.3” TFT touch screen Loudspeaker volume potentiometer Programmer button. Only used for flashing firmware to the microcontroller. - Page 11 PhaseLockManual Supply Mixer Signal HV Amplifier AVR32 System Control Processor locked power trigger in clip HV out 1 search out clip monitor 1 local oscillator 50 Ω monitor 2 HV out 2 input output A optical input 850 ... 1650 nm reset prgm output B...
- Page 12 PhaseLockManual “overheat” red LED: if the HV amp stage is overheated, this red LED is on, and the output voltage is switched off “power down” red LED: this LED is on, when the amplifier voltage is disabled due to overheating or overcurrent HV output BNC plugs (HV out 1 and HV out 2) for e.g.
-
Page 13: Rear Panel Elements
PhaseLockManual Rear panel elements 9 10 11 12 AC 230 V 1.6 A T power overheat TEM Messtechnik GmbH AC 115 V 50-60 Hz Grosser Hillen 38 power down 3.15 A T 30559 Hannover, Germany 230V HV out 2 HV out 1... - Page 14 DC 9...36V CAUTION power down overheat HIGH VOLTAGE HV out 2 HV out 1 TEM Messtechnik GmbH Grosser Hillen 38 30559 Hannover, Germany do not cover www.TEM-Messtechnik.de Figure 7: Rear panel elements (DC12V version) Description “aux” HD15 Socket. Auxiliary connector for special functions.
-
Page 15: Touch Screen
PhaseLockManual Touch screen 4.3.1 Display settings To adjust display settings like LED backlight brightness or screensaver settings go to (menu miscellaneous display settings) Backlight brightness The brightness of the LED backlight can be adjusted in 10 steps e.g. to avoid bright display illumi- nation in dark rooms. -
Page 16: Installation
Place PhaseLock suitably, taking into account the safety warnings in chapter 2. Mains Connection PhaseLock has an IEC power socket at the rear side (unless otherwise ordered, see section 5.3). Use the delivered power cord for connection to the AC mains. If country-specific cables are required use high quality power cords, fitting to the local power supply outlets. -
Page 17: Getting Started
If ”Kangoo” has not yet been installed on your computer, please follow the instructions in chapter 9 on software and driver installation. Connect the PhaseLock to the PC by means of a standard USB (A-B) cable. (Please avoid cables longer than three meters, especially if strong electromagnetic fields are present in your environment). -
Page 18: Input Signal Connections
(so-called intermediate signal) containing the information about the frequency and phase difference of the input signals. Operation of the PhaseLock requires the LO frequency to equal the repetition frequency of the laser or an integer multiple thereof (a harmonic of the pulse signal): = n f , n = 1, 2, 3, ... -
Page 19: Output Signal Connections
15-pole ”input” connector of the PhaseLock device (see figure 11). Please note that the amplitude of the signals inside the mixer is adjusted remotely by the PhaseLock ’s signal processor. Therefore, this connection must be made before power up. - Page 20 PhaseLockManual 20kS/s CHX:2V= CHY:2V= Oscilloscope Amplified photo diode + optional bandpass filter (delay in) (delay out) n·f Reference oscillator (sinusoid 0...7dBm) Figure 11: PhaseLock input and monitor wiring scheme 20 / 60 6 GETTING STARTED...
-
Page 21: Output Signal Range
”HV out 1 ” and ”HV out 2” BNC connectors at the rear side. Before connecting PZTs, please check that they comply with the output voltage range of PhaseLock (standard: 0. . . 150 V)! However, see section 6.5 for a software reduction of the output voltage range. -
Page 22: Switch The Device On
For the MCPC option, choose “input X” for monitor output 1 and ”input Y” for monitor output 2: When operating the PhaseLock by PC control (Kangoo software), click to the selector ”monitor 1” and choose ”norm X”, then click to the selector ”monitor 2” and choose ”norm Y”. When operating the PhaseLock by the touch panel, press the button ”Monitor”. - Page 23 The oscilloscope now displays the mixer output signal (intermediate signal) as it is received and digitized by the PhaseLock electronics. The signal shape should be a sinusoidal (MCPC: a cosine (x) and a sine (y) signal – a Lissajous figure) with an amplitude of several volts peak-to-peak), like shown in figure 15.
-
Page 24: Input Signal Adjustment
Figure 16: Intermediate signals properly adjusted in terms of offset, amplitude and phase, displayed in Y–T mode (left) or X–Y mode (right, MCPC version only). When operating the PhaseLock by touch panel, navigate to the ”Input settings” menu (see fig. 17) by pressing menu Input settings. -
Page 25: Output Signal Check
6V, see right hand side of figure 16. MCPC option only: The PhaseLock can detect the presence of the RF input signal from the radius of the Lissajous figure. To enable this feature, set the ”Min. Radius” value to 4 V which is well below the actual value of about 6 V. -
Page 26: Check Of The Actuator At Output A (Hv Out 1)
6.9.2 Check of the actuator at output A (HV out 1) When operating the PhaseLock by touch panel, navigate to the ”Regulator A” menu (see fig. 19) by pressing menu Regulator A. When using the Kangoo software, locate the respective GUI elements on the screen. -
Page 27: Taking The Pid Regulator A Into Operation
6.10 Taking the PID regulator A into operation The purpose of the PhaseLock is to adjust the laser in a way that 1. its repetition frequency (or a multiple thereof) equals the reference frequency, and 2. the relative phase of both oscillations stabilizes at a preset value. For a pulsed laser, the ”phase”... - Page 28 PhaseLockManual When operating the PhaseLock by touch panel, navigate to the ”Regulator A” menu (see fig. 21) by pressing menu Regulator A. When using the Kangoo software, locate the respective GUI elements on the screen. Figure 21: Regulator A adjustment screen and GUI (default settings) Check the PID gain settings (P=1.0, I=0.000001, D=0.0;...
-
Page 29: Optimizing The Pid Regulator
PhaseLockManual Figure 22: ”Error signal” and ”Reg out A” signal when the regulator is switched on, with correct setting of the regulator sign (left) and false setting (right) 6.11 Optimizing the PID regulator The aim of this section is to trim the PID regulator A to achieve the best possible phase stability with the given laser. -
Page 30: Taking The Pid Regulator B Into Operation
If your laser is equipped with only one actuator, installation and set–up are now finished. You may wish to proceed with chapter 7 to learn more about the daily work with your PhaseLock or with chapter ?? to check possible further improvements to the lock quality. - Page 31 PhaseLockManual Figure 23: Regulator B adjustment screen and GUI (default settings). Note that the LED ”A locked” is green as a prerequisite for the operation of regulator B. As regulator B is supposed to work very slowly (only for drift compensation), we recommend to reduce its sampling rate by some factor (64, e.g., see figure 23).
-
Page 32: Loss Of Input Signal And Hold Mode
In such a case, some action is required to bring the laser back in a frequency range that can be covered by the mixer so that the PID can continue working. This can be done manually by the user or automatically by ”search mode” of the PhaseLock — see following section 6.14... - Page 33 The search scan is started (2) and does not stop until the radius (3) is above threshold (4). Do not forget to click to ”save” on the TFT or on ”Save to C” on the GUI to store the parameters to the non-volatile memory of the PhaseLock device. 6 GETTING STARTED...
- Page 34 PhaseLockManual Figure 26: Timing and condition diagram for the automatic search scan 34 / 60 6 GETTING STARTED...
-
Page 35: Operation
Anyway, if you prefer to switch the PhaseLock off over night, e.g., simply toggle the mains switch at the rear side (desk top case) or on the front panel (19” rack case) of the device. - Page 36 PhaseLockManual Figure 27: Intermediate signal (monitor signals ”Input X normalized” and ”Input Y normalized”) displayed on an oscilloscope in Y–T mode when the laser is locked. The actual angular distribution of this ”cloud” depends on the laser’s stability. If it is very stable, the signal may appear merely as a dot rather than a sickle.
-
Page 37: Detailed Description
Detailed description Frequency Mixer The PhaseLock device is a system to control the pulse timing of pulsed lasers. It controls the repetition rate of pulsed lasers and adjusts this rate in a way that the pulses are generated with at fixed times relative to a reference clock. -
Page 38: Signal Monitor
8.2.1 Analog monitor signals PhaseLock provide access to several internal signals. Although the signal processing is purely nu- merical, the monitor picks intermediate calculation results and reconverts them into analog signals by means of D/A converters so that the user can probe them with an oscilloscope just as if he was checking an analog circuit. -
Page 39: Ttl Output
RF signal has a lower frequency than the LO. +/-10V corresponds to 26.2ms (32768/1.25MHz) Note: Values from 33 to 52 are available in twin systems, i. e. systems that handle two PhaseLock RF mixers. - Page 40 Files” folder. On Windows Visa or Windows 7 systems, please avoid the “Program Files” folder and choose and a different path, for example “C:/TEM”. The button “OK, install now!” starts copying all required files from the source path to the destination path. During the installation procedure, the installation program checks all required files.
-
Page 41: Installation Of Labview Drivers
Once the installation is complete, Windows will assign a COM-port. To find out which COM-port has been assigned, check for a new entry in the section “Ports (COM & LPT)” of the device manager. The device will appear as “TEM uC Virtual Com Port” in the device manager of your computer (see figure 29). -
Page 42: Upgrading The Firmware
PhaseLockManual Upgrading the Firmware Please contact TEM Messtechnik for details about firmware upgrades. 42 / 60 9 SOFTWARE INSTALLATION... -
Page 43: Communication Interface
PhaseLockManual Communication interface 10.1 Communication syntax The communication between PC and microcontroller is carried by an ASCII-encoded stream of char- acters. (Exceptions are sometimes made in order to achieve fast binary data transfer.) The stream is structured in lines, the ends of which are marked by ASCII 13 (carriage return), followed by ASCII 10 (line feed). - Page 44 PhaseLockManual it will set the value of ”CutOff” to 1000 and echo the value: CutOff= 1000 An ASCII 92 (backslash) at the beginning of the line suppresses the echo. Example: If the microcontroller receives CutOff= 1000 it will set the value of ”CutOff” to 1000 and not echo the value, unless the value was not accepted. (In that case the echo will tell the actual value.) If the rest of the line (after the equal sign) does not contain a value, the microcontroller responds telling the actual value.
-
Page 45: Variables
PhaseLockManual 10.2 Variables The following tables lists the most important operational parameters (stored as ”variables” in the microcontroller). A complete list of variables and their values can be obtained using the command ”vardump” (see section 10.1). 10.3 Input settings Parameter name Default Description Access... -
Page 46: Monitor Settings
PhaseLockManual 10.5 Monitor settings Parameter name Default Description Access value mode Monitor1Select Selection of probe signal for Monitor X output. See monitor description Monitor1Chopper Second probe signal for Monitor X output. If not off, the monitor output quickly switches between the signal selected here and by Moni- tor1Select, thus virtually displaying both signal simultaneously on the oscilloscope. -
Page 47: Regulator (Servo Loop) Settings
PhaseLockManual 10.6 Regulator (servo loop) settings Parameter name Default Description Access value mode RegOnOff General enabling of all regulators ErrorScale Attenutation of the error signal (in powers of 2). Set to 0 to cover +/-10V range with +/-180 of signal phase RegOnOffA Setting this value to 0 makes servo loop A inactive. -
Page 48: Output Settings
PhaseLockManual 10.7 Output settings Parameter name Default Description Access value mode RegOutRangeA, Re- 100000 Voltage range that can be addressed by regula- gOutRangeB tors A, B (before high voltage amplifier, if this is present) RegResetValueA, Value of the regulators A, B output voltage RegResetValueB when the regulator is off. -
Page 49: Scan Settings
PhaseLockManual 10.10 Scan settings Parameter name Default Description Access value mode Scan (timing shift) settings ScanEnable General on/off for the scan generator ScanWidth 1000 Total scan width (max min value) ScanOffset Center value of bipolar scan; start value for unipolar scan ScanReady ScanNmbOfSteps Number of steps in a stepwise scan. -
Page 50: Trigger Settings
PhaseLockManual 10.11 Trigger settings Parameter name Default Description Access value mode PointTriggerMode Defines event upon which a new scan step is made. PointTriggerEdge Sign of optional point trigger TTL input. ScanTriggerMode Defines event upon which a new scan is started. ScanTriggerEdge Sign/behavior of optional scan trigger TTL in- put. -
Page 51: Motor Driver Settings
PhaseLockManual 10.12 Motor driver settings Parameter name Default Description Access value mode MEnable Enables the motor control. MReady Flag indicating that the stepping motor has reached the target position MRangeClip Flag indicating that the stepping motor has reached the limit of its range MPosition Actual motor position Read-only... -
Page 52: Dither Lock Settings
PhaseLockManual 10.13 Dither lock settings Parameter name Default Description Access value mode ScanModAmplitude Amplitude of sinusoidal modulation on scan generator (for dither lock, e.g.) LockInFrequencyA 20000 Dither frequency of dither generator A LockInInputSelectA Signal selected a input to demodulation for dither lock. -
Page 53: Measurement Settings
PhaseLockManual 10.14 Measurement settings Parameter name Default Description Access value mode MeasClockDivision Used to slow down the reading of measurement values during a scan. DatasetNumber Number of measurement being performed. NumberOfFrames Number of data frames recorded at each scan point. NumberOfPoints Number of measurement points (typically = ScanNmbOfSteps) -
Page 54: Electrical Specifications
PhaseLockManual Electrical Specifications 11.1 Technical Data Mixer / Input stage Input Impedance required LO power +4 . . . +7 dBm RF sensitivity 0 . . . +7 dBm Bandwidth 1 MHz ... 1 GHz (standard configuration) Sampling rate 1.25 MSps Outputs Voltage range LV (front) -10.0...10.0 V at 1 k... -
Page 55: Mains Power Cable
PhaseLockManual 11.2 Mains Power Cable Use the included power supply cable that provides proper grounding contact. The system may be delivered with country-specific mains power cables. The power supply automatically adapts to local main power supplies of 100...120 VAC, 220...240 VAC. -
Page 56: Delivery Content
(see section 3) Customer Service In case of service needs, general questions, need of repair or warranty claims you will get quick and effective support at: TEM Messtechnik GmbH Grosser Hillen 38 D-30559 Hannover Germany Tel: +49 (0)511 51 08 96 -30 Fax: +49 (0)511 51 08 96 -38 E-mail: mailto:info@TEM-messtechnik.de... - Page 57 PhaseLockManual Notes 13 CUSTOMER SERVICE 57 / 60...
- Page 58 PhaseLockManual Notes 58 / 60 13 CUSTOMER SERVICE...
- Page 59 PhaseLockManual Notes 13 CUSTOMER SERVICE 59 / 60...
- Page 60 PhaseLockManual Notes 60 / 60 13 CUSTOMER SERVICE...
Need help?
Do you have a question about the PhaseLock and is the answer not in the manual?
Questions and answers