Vescent Photonics D2-105 Manual Download Page 1 | Manualshive

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Laser Controller

Vescent Photonics, Inc.

www.vescentphotonics.com

4865 E. 41

st

Ave

Denver, CO 80216

Phone: (303)-296-6766

Fax: (303)-296-6783

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Summary of Contents for D2-105

Page 1: ...Laser Controller Vescent Photonics Inc www vescentphotonics com 4865 E 41st Ave Denver CO 80216 Phone 303 296 6766 Fax 303 296 6783 ...

Page 2: ......

Page 3: ...rviceable parts inside the instrument Work performed by persons not authorized by Vescent Photonics may void the warranty CAUTION Although ESD protection is designed into the instrument operation in a static fee work area is recommended WARNING To avoid electrical shock hazard connect the instrument to properly earth grounded 3 prong receptacles only Failure to observe this precaution can result i...

Page 4: ......

Page 5: ... repair attempts made without authorization by Vescent Photonics from damage caused by operation of equipment outside of its specified range as stated in either the product specification or operators manual from damage due to improper connection to other equipment or power supplies This warranty is in lieu of all other warranties including any implied warranty concerning the suitability or fitness...

Page 6: ...bsolute Maximum Ratings Note All modules designed to be operated in laboratory environment Parameter Rating Environmental Temperature 15 C and 30 C Environmental Humidity 60 Environmental Dew Point 15 C ...

Page 7: ...bling high speed servo control of the laser s frequency The current servo input can accommodate input frequencies over 10 MHz and is limited by the 1 kΩ input impedance Additionally an RF port is available for higher frequency modulation 1 Sub mK stability requires a proper thermal design and proper tuning of the temperature controller to the thermal plant If you did not purchase the Laser Control...

Page 8: ...Gain Low 20 20 mK V Gain High 600 600 mK V Temperature Control Temperature setpoint range 1 50 1 50 C Temperature isolation T2 4 TBD TBD mK C Long term stability T2 1 1 mK day Temperature coefficient 5 controller T2 TBD TBD mK C Max TEC current voltage 1 4 1 4 A V 3 All current noise measurements made with Laser Controller powered by D2 005 placed 5ft away from Laser Controller Placing D2 005 clos...

Page 9: ...t Monitor Output 199 9 Vescent Photonics Inc Denver Colorado USA MADE IN U S A Power I O Power I O Remote Interlock Setpoint Input Setpoint Enable Short Open On Off Model D2 105 Laser Enable T1set I Ilim T1 T2set T2 mA mA C mK C mK T1 Housing Temp T2 Laser Temp Temp Error Monitor Laser Controller DIM Temp Control T2 Set T2 T1 Power Servo Standby Temp Status Laser On on off reset Current Control RF...

Page 10: ... Scale Dial The course current control sets the laser diode injection current between 0 and 200 mA 0 and 500mA for 500mA version To set the current switch the selector knob in the monitor section so that the current LED I is lit Then adjust the course current to the desired setting Current Limit Set Trimpot The current limit set is a front panel trimpot adjustment Set the selector knob to the Ilim...

Page 11: ...ires 15V and 5V in order to light Temp Status dual LED indicators The temperature status LED indicators turn red whenever the temperature servo loop has been disengaged The temperature servo loop will disengage when the temperature is below 1 C above 50 C or the thermistor is shorted or open Additionally when the TEMP LOCK is in standby mode the servo loop is off and the LED s will be red The temp...

Page 12: ...ity of the locked laser Normally the Temp Servo Input is used to drive the dc value from the Current Servo Ouput on the Laser Servo to zero over long time scales In other words temperature tuning is used to remove large slow variations in the laser frequency To accomplish this connect the Temp Servo Output from the Laser Servo module to the Temp Servo Input of the Laser Controller with TEMP SERVO ...

Page 13: ...nce the interlock has been tripped the laser will stay off until it is manually reset with the front panel switch Setpoint In SETOINT IN is an analog input When the SETPOINT ENABLE is LOW 0V the SETPOINT IN voltage value sets the injection current instead of the front panel dial Zero volts sets zero current and 6V sets the maximum value of 200 mA 500mA for 500mA version This input is rolled off at...

Page 14: ...an skip this section This section will describe the basic theory about tuning the temperature servo response and provide step by step instructions for tuning the servo response to your thermal load To get good temperature stability the temperature servo response needs to be tuned to match the thermal load Access to tuning the temperature response is provided on the right side panel of the Laser Co...

Page 15: ... on the side panel The first pole ω1 is the Proportional Integrator PI pole or the frequency where the gain switches from being an integrator to proportional The second pole ω2 is the Differential D pole or the frequency where the gain becomes differential The final pole ω3 is where the differential gain ends and the gain becomes proportional again 15 Transfer Function ω 1 ω 2 ω 3 Frequency Gain T...

Page 16: ... an RC time constant given by the sum of the times of all the switches in the on position same as with the Integral bank of switches The PROPGAIN trimpot tunes the overall gain of the system and is adjustable by a factor of 200 Additionally the TSET1 trimpot is used to adjust the set point temperature for stage 1 stage 2 is controlled on the front panel The STBY SERVO switch can disable temperatur...

Page 17: ...cillation period in step 6 and divide by two Set the Integrator time constant to this value If you measured a period of oscillation of 14 seconds turn on the 4th 2 2s and 5th 4 7s switches in the integrator bank to get a time constant of 6 9s 9 Turn off the proportional switch 10 Turn the DiffGain trimpot all the way CW 11 Set the Differential switches to the same position as the integral one This...

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