HighQ Sync HQL User Manual
Contents
1. SyncHQL Timing Stabilizer Option For Modelocked Laser Systems USER MANUAL HIGH Q LASER PRODUCTION GMBH KAISER FRANZ JOSEF STR 61 A 6845 HOHENEMS AUSTRIA TEL 43 5576 43040 FAX 43 5576 43050 E MAIL sales highQlaser at HTTP WWW HIGHQLASER COM CONTENTS 3 1 3 2 4 1 4 2 4 3 5 1 5 2 6 1 6 2 VUE EE 3 SOY ee 4 INSPECTION and UNPACKING coommonccnnnnnnnnnnnancnnnnnncnnn rr 5 Inspection Of SHIPPING DOXBS ommccconccccnononccnnnnncnnnnnnrrrn erre 5 UNDACKINO ochoa 5 SYNG option nstallatiON ooo dans 6 SYNC controller size and POSITION ssssssssssunseunneunnnunreunnunnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnne nnnn nunnana 6 ale e EE 6 Cable connections and output monitoring COnnectors mcccoccccnnnnnannnncnnonenanenannnnnnncnrnannnnnas 7 SYNC synchronization technique omoomncccnnnnnnccconecnnncnnc rn 9 Synchronization principle ccceececeeceseeeeeeeeeeeeeeeecaeseseeeenseeeseaeeeseaesesneeeneeeeseaeseseaeeasneeeeneeess 9 BASIC AU EE 9 How to operate the SYNC Option oocoocccccocnonnnnnncccaneccnncrnrnnrr rc 11 SYNC controller front panel ccccccccescesseeeeseeeeeeeeesneesesneeeneneeseaesesaeenseeeeseeeesnaeseneeeeneeeeseaees 11 High Q Laser SYNC utility SYNC remote control via Win PC ccssceseesseeeseeeeeeeeeeeee 12 1 Welcome We of High Q Laser Production GmbH are happy to welcome you among our customers The products of High Q Laser are manufactured with g2. 30dBm Laser Level Signal Amplitude of the Laser Input in dBm The signal level should be within the range of Odbm to 30dBm HV Temp Temperature of the high voltage amplifier The amplifier will heat up in closed loop mode if the laser is operated in a noisy environment Closed Loop Errors If an error occurs during closed loop mode the controller will switch to open loop mode and report the error in this section The explanation of each error code is listed below Servo Either servo is out of range or servo is not connected Ensure that the SyncCtrl Cable is connected and that the frequency of the reference signal is in the specified range Piezo Either piezo is out of range or piezo is not connected Ensure that the piezo is connected SyncCtrl Cable and that the frequency of the reference signal is in the specified range Temp the temperature of the high voltage amplifier is above the limit Wait until the unit is cooled down and then try again RMS The timing jitter raised above the specified threshold Timeout Synchronization is not possible Ref Level The Signal level at the input labeled Ref is out of range lt 30dBm or gt OdBm Ensure that the signal level is within the specified range OdBm to 30dBm Laser Level The Signal level at the input labeled PD is out of range lt 30dBm or gt OdBm Ensure that the laser is on
3. 30dBm lt Reference signal amplitude lt 0dBm into 50 Ohms frequency within 5 kHz of target pulse frequency sinusoidal signal shape low noise e COM Serial data interface to Windows PC connect the RS232 RS485 converter into one of the serial PC interfaces COM1 COM4 Connect the RS485 terminal on the adapter with the corresponding connector at the SYNC controller back panel labeled COM Make sure that the RS232 RS485 converter switches are in the correct positions DCE SIM T ON R_ON corresponding to full duplex mode e Mon PD BNC connectors at the SYNC controller back panel It provides split output of the photo detector 3dB monitoring the modelocked pulse train This output should be terminated with 500hms even if not used e Mon Ref BNC connectors at the SYNC controller back panel It provides split output of the Reference Signal 3dB This output should be terminated with 500hms even if not used e Phase BNC connector at the SYNC controller back panel The signal at this output corresponds to the phase detector output and directly allows for monitoring the phase jitter The scaling is selected by software 10mV degree 100mV degree or 1000mV degree For monitoring this output on an oscilloscope use a high impedance input gt 1 MOhm and AC coupling e Error Out BNC connector at the SYNC controller back panel This loop is open if an error occurs SyncHQL V1 00 Er
4. laser and the frequency reference a control circuit followed by a piezo amplifier controls the piezo voltage and therefore the laser pulse frequency until the laser is synchronized to the frequency reference deviation between the reference signal and the laser pulse train Based on the phase detector output a feedback circuit controls the length of the laser resonator until synchronization is achieved To provide synchronisation on a short time scale 10 several 10 kHz to Hz frequency regime the piezo holds one of the laser cavity mirrors at the required position and thereby controls the laser cavity length within a few microns On a longer time scale seconds to hours a microprocessor unit controls the position of a laser cavity mirror on a coarse scale and changes the cavity length stepwise whenever the piezo reaches its limits 11 6 How to operate the SYNC option High Q Laser s SYNC option is contained in a separate controller box which is connected to the laser system components that need to be controlled for synchronization such as the voltage controlled piezo and the slow motion stepper motor SYNC controller front panel 6 1 SYNC controller front panel The SYNC controller front panel contains a green LED indicating ON a white LED labeled Closed Loop and a push button labeled Start Stop e ON LED green indicates that the unit is powered up e Closed Loop LED white indica
5. and the input labeled PD at the controller back panel is connected with the corresponding connector at the laser head Oscillating Either there is too much noise so that it is not possible to stay in Closed Loop mode or the laser is not working properly 7 Notes
6. controlling the SYNC controller It is recommended to run this utility at installation and from time to time to ensure that all parameters are within specification The controller is connected to a Windows computer via a serial RS 232 interface Start the utility provided on the floppy disk With the utility it is possible to control the synchronization unit to monitor measured data and to check if an error occurred Set Values e Start Stop Toggle between closed loop and open loop operation e Phase Offset Change the phase offset between the reference signal and the modelocked pulse train 13 Phase Output Select the scaling of the output at the controller back panel labeled Phase It is possible to select Auto 10mV deg 100mV deg or 1000mV deg It is recommended to set to Auto if automatically measurement of the timing jitter is desired Actual Values Mode Change Mode either with the Start Stop button in the utility or with the corresponding push button at the SYNC Controller front panel Three modes are 6b possible Open Loop Synchronizing and Closed Loop RMS Timing jitter in fs The measurement of the jitter requires that the phase output selector is set to Auto to work properly Ref Level Signal Amplitude of the Reference Input in dBm The signal level should be within the range of Odbm to
7. er back panel is in the OFF position labeled 0 e Power connection Connect the 115VAC or 230 VAC wall plug connector at the laser controller back panel to the corresponding wall plug outlet with a voltage in the range as provided on the SYNC controller back panel Use the power cord which was contained in the shipment or in any case a 3 pin power cord which has a ground pin The unit is now grounded In case the unit needs to be operated at a wall plug voltage different from the labeling provided on the back panel please contact High Q Laser or their sales representatives The SYNC controller is preset to either 115 VAC or 230 VAC usually as provided by the back panel labeling e Fuse The fuse contained in the back panel connector should read 2 A slow blow e SYNC Ctrl PD Connections to laser head Use the RF and control cables contained in the shipment to connect into the corresponding connectors at the SYNC controller back panel labeled SYNC Ctrl and PD respectively Then plug the other ends into the corresponding connectors at the laser head e REF Reference signal input Provide a sinusoidal electrical reference signal with the target frequency to this connector The frequency should be within the specified laser repetition rate For best timing jitter results a low noise electrical reference source such as the HP8662A 003 or HP8663A 003 is recommended Reference signal requirements
8. it or service requires the unit to be shipped back to the factory 4 SYNC option installation This section describes the installation procedure of the SYNC option Fora description of the functionality and pictures of the front panel please be referred to the next sections 4 1 SYNC controller size and position The SYNC controller box size is ca 470 x 200 x 88 mm length x width x height The size is designed such that it can be mounted next to a standard half 19 rack sized laser controller and to fit into a 2 height units high 19 rack housing next to each other If you prefer to mount the laser controller in a 19 rack housing contact High Q Laser Production GmbH for adapters The controller needs to be positioned within a cable length of less than 2 m away from the laser head 4 2 Heat flow Please make sure that the heat flow from the front panel through the SYNC controller and out of the back panel should not be inhibited to ensure that the instrument does not heat up when operated The controller has an internal temperature monitor which switches the high voltage section off in case the temperature becomes too high 4 3 Cable connections and output monitoring connectors Sync Ctrl o e Back Panel of the SYNC Controller The following procedure needs to be followed when installing the cable connections from the SYNC controller to the laser head e Confirm that the main switch at the SYNC controll
9. reatest care and best materials Should you encounter any problems with or have questions about our products please contact us directly or our sales representative We are committed to providing premier support and service to our customers HIGH Q LASER PRODUCTION GMBH KAISER FRANZ JOSEF STR 61 A 6845 HOHENEMS AUSTRIA TEL 43 5576 43040 FAX 43 5576 43050 E MAIL sales highQlaser at http www highQlaser com 2 Safety Your SYNC option comes with a High Q Laser system Please be referred to the Safety Section of the corresponding User Manual of that laser system 3 Inspection and unpacking 3 1 Inspection of shipping boxes Before unpacking make sure that the shipping boxes are undamaged Any damage needs to be reported immediately to the shipping carrier and High Q Laser Production GmbH or our representatives respectively 3 2 Unpacking When unpacking the shipment confirm that the following items are included e the SYNC controller electronics with a size of ca 47 x 20 x 8 8 cm e interconnecting cables and accessories 2 RF cables ca 2m long control cable 2m long communication cable 2m long RS232 485 converter power cord ca 2 m long user manual Inspect every item with respect to any loss or signs of damage and notify High Q Laser Production GmbH or the sales representative if a problem occurs It is recommended that you keep the original shipping boxes in case you would like to move the un
10. ror Out BNC 4 1 min 10mA gt 1V Ll 2 SFH6106 3 error J HS 1 T 1 4 470R SFH6106 3 5V4 e AUX1 General Input Output for additional features 5 SYNC synchronization technique The SYNC option allows to synchronize the modelocked pulse train to an external electrical low noise sinusoidal reference signal 5 1 Synchronization principle Synchronization is achieved by putting one laser resonator mirror on a voltage controlled piezo The voltage applied to the piezo changes the cavity length and thus the modelocked pulse repetition rate In a feed back loop the pulse repetition rate is controlled and adjusted until the pulse frequency is locked to an externally provided frequency reference signal In addition to this fast and fine cavity length control a slow microprocessor controlled stepping mechanism provides coarse cavity length control 5 2 Basic setup The heart of High Q Laser s SYNC option is a phase detector circuit which converts the phase between the frequency reference and the laser pulse train signal into a voltage signal This phase detector output carries the information about the temporal Frequency reference Phase Control Piezo Piezo Mm Laser detector circuit amplifier Photodiode SYNC option block diagram of analog control circuit A phase detector determines the phase difference between the modelocked
11. tes that the modelocked laser pulse train is in synchronization with the reference signal if continuously on Slow blinking is indicated when synchronization is being prepared e The Start Stop push button to be used to toggle between closed loop and open loop operation When the button is pushed for closed loop operation the white LED blinks for a few seconds until the laser is in synchronization with the reference signal If in synchronized operation pushing the button stops synchronization and puts the SYNC option into open loop operation 12 6 2 High Q Laser SYNC utility SYNC remote control via Win PC High Q Laser RS422 GUI 1 00 Alpha Ioj x 10285 SYNC HAL V1 0 E Q picoT RAIN ps HighRepRate OSC R LC1 LP SwW 4 00 ID2 Q TECSWV152 ID Set Values SYNC HOL SWY1 00 ID5 E P picoTRAIN ps HighRepRate P AMP Start Stop Y LCIHPSwv4 00 Di Phase Offset 90 02 deg Phase Dutput Auto y m Actual Yalues Mode Open Loop RMS not available Phase Output 10mW deg Ref Level Laser Level HY Temp E M Closed Loop Errors Servo Timeout Piezo Ref Level Temp Laser Level RMS Oscillating Clear Errors Status Report Auto Update Status Report Example configuration for the Utility showing the SYNC screen The SYNC option is provided with a serial data interface to a Windows PC anda software utility program which allows
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