d2:laser_controller
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d2:laser_controller [2019/03/07 17:53] – Michael Radunsky | d2:laser_controller [2019/07/19 18:19] – Michael Radunsky | ||
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</ | </ | ||
<WRAP half column> | <WRAP half column> | ||
- | |||
<WRAP round box 250px>< | <WRAP round box 250px>< | ||
- | </ | + | </ |
- | </ | + | |
===== Absolute Maximum Ratings ===== | ===== Absolute Maximum Ratings ===== | ||
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**Temp Servo Input (BNC)** | **Temp Servo Input (BNC)** | ||
- | The temperature servo input is summed to the T2 temperature set point signal and can be used to make electronic perturbations to the laser diode temperature. | + | The temperature servo input is summed to the T2 temperature set point signal and can be used to make electronic perturbations to the laser diode temperature. |
+ | |||
+ | <WRAP center round box 570px>< | ||
When the gain is set to " | When the gain is set to " | ||
- | When the gain is set to " | + | When the gain is set to " |
The " | The " | ||
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**Setpoint In** | **Setpoint In** | ||
- | SETPOINT IN is an analog input. When the SETPOINT ENABLE is LOW (0 V) the SETPOINT IN voltage value sets the injection current instead of the front panel dial. Zero volts sets zero current and 6 V sets the maximum value of 200 mA (500 mA for 500 mA version). | + | SETPOINT IN is an analog input. When the SETPOINT ENABLE is LOW (0 V) the SETPOINT IN voltage value sets the injection current instead of the front panel dial. Zero volts sets zero current and 4 V sets the maximum value of 200 mA (500 mA for 500 mA version). |
This input is rolled off at 14 Hz, which is not much higher frequency than the front panel dial, which rolls off at 8 Hz, with a second pole at 4 Hz. Therefore, noise can enter the circuit at this point and this input should be used with caution. | This input is rolled off at 14 Hz, which is not much higher frequency than the front panel dial, which rolls off at 8 Hz, with a second pole at 4 Hz. Therefore, noise can enter the circuit at this point and this input should be used with caution. | ||
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When disconnected, | When disconnected, | ||
+ | |||
+ | The Servo Input on the front panel continues to function when the SETPOINT ENABLE is pulled low. | ||
=====Turning on the Laser Diode===== | =====Turning on the Laser Diode===== | ||
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To reset the temperature loop parameters to the approximate settings for a Photodigm TOSA DBR Laser: | To reset the temperature loop parameters to the approximate settings for a Photodigm TOSA DBR Laser: | ||
- The T1 loop is not used as the TOSA only has one TEC. | - The T1 loop is not used as the TOSA only has one TEC. | ||
- | - Set the dip switches to the configuration shown in <tabref factory_set2_post6987_TOSA> | + | - Set the T2 dip switches to the configuration shown in <tabref factory_set2_post6987_TOSA> |
- Measure the resistance across GND5 and probe point GAIN2. Set this resistance to between 1.01 kΩ and 1.03 kΩ by adjusting trimpot PROPGAIN2. | - Measure the resistance across GND5 and probe point GAIN2. Set this resistance to between 1.01 kΩ and 1.03 kΩ by adjusting trimpot PROPGAIN2. | ||
d2/laser_controller.txt · Last modified: 2024/03/27 15:33 by Thomas Bersano