d2:laser_servo
Differences
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d2:laser_servo [2019/07/12 23:10] – Michael Radunsky | d2:laser_servo [2021/12/17 01:58] (current) – external edit 127.0.0.1 | ||
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The D2-125 Reconfigurable Laser Servo contains a tunable PI< | The D2-125 Reconfigurable Laser Servo contains a tunable PI< | ||
- | The main component in the Reconfigurable Laser Servo is the PI< | + | The main component in the Reconfigurable Laser Servo is the PI< |
The Laser Servo can be unlocked by a computer (via TTL control) to jump the output voltage to a set voltage difference from the current lock point, or to a specific voltage. This feature can be used to jump the laser frequency a known distance away and then relock to the original or a new lock point frequency. This feature can be used for auto-locking or relocking routines. | The Laser Servo can be unlocked by a computer (via TTL control) to jump the output voltage to a set voltage difference from the current lock point, or to a specific voltage. This feature can be used to jump the laser frequency a known distance away and then relock to the original or a new lock point frequency. This feature can be used for auto-locking or relocking routines. | ||
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<WRAP center round box 600px> | <WRAP center round box 600px> | ||
| | **Value** | | | **Value** | ||
- | | **Input and Output Impedance** | + | | **Input and Output Impedance** |
| **Output Voltage (main and aux)** | | **Output Voltage (main and aux)** | ||
| **Input Voltage Noise**(( Referenced to 50Ω load)) | | **Input Voltage Noise**(( Referenced to 50Ω load)) | ||
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Located at the top of the front panel, the monitor section contains 6 BNC outputs for monitoring various signals used by the Laser Servo. The logic of the monitors is shown in <imgref image1> | Located at the top of the front panel, the monitor section contains 6 BNC outputs for monitoring various signals used by the Laser Servo. The logic of the monitors is shown in <imgref image1> | ||
- | <WRAP center round box 420px>< | + | <WRAP center round box 420px>< |
**Error In** | **Error In** | ||
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** Aux: Bipolar / Aux: Unipolar (2-position slider switch) ** | ** Aux: Bipolar / Aux: Unipolar (2-position slider switch) ** | ||
- | This 2-position slider switch is only accessible by removing the right side panel (see above) and sets whether the AUXILIARY OUTPUT SERVO is unipolar or bipolar. It is factory set to be bipolar so the auxiliary output can range from -12 V to +12 V. For some applications such as driving a PZT, limiting the voltage range to positive values is necessary. | + | This 2-position slider switch is only accessible by removing the right side panel (see above) and sets whether the AUXILIARY OUTPUT SERVO is unipolar or bipolar. It is factory set to be bipolar so the auxiliary output can range from -10 V to +10 V. For some applications such as driving a PZT, limiting the voltage range to positive values is necessary. |
**Ramp Master / Slave (Jumper)** | **Ramp Master / Slave (Jumper)** | ||
- | This jumper is only accessible by removing the right side panel (see above) and sets whether the ramp input is in master or slave mode. It is factory set to be in MASTER MODE. In SLAVE MODE (jumper off) the RAMP signal is generated externally and input through the back panel RAMP I/O port. In MASTER MODE (jumper on) the ramp is generated internally and is sent out to the RAMP I/O port for driving other D2-125 Laser Servos configured in SLAVE MODE. | + | This jumper is only accessible by removing the right side panel (see above) and sets whether the ramp input is in master or slave mode. It is factory set to be in MASTER MODE. In SLAVE MODE (jumper off) the RAMP signal is generated externally and input through the back panel RAMP I/O port. In MASTER MODE (jumper on) the ramp is generated internally and is sent out to the RAMP I/O port for driving other D2-125 Laser Servos configured in SLAVE MODE. |
+ | |||
+ | The amplitude of the slave ramp is about -5x of the master ramp input (at slave Ramp Amp maximum). | ||
====Lock Guard==== | ====Lock Guard==== | ||
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<WRAP center round box 400px> | <WRAP center round box 400px> | ||
| **C** | **B** | **A** | ** Hold Time** | | **C** | **B** | **A** | ** Hold Time** | ||
- | |0ff|0ff|0ff| 60 µs | 150 µs | | + | |Off|Off|Off| 60 µs | 150 µs | |
- | |0ff|0ff|0n| 125µs | + | |Off|Off|On| 125µs |
- | |0ff|On|0ff| 250 µs | 600 µs | | + | |Off|On|Off| 250 µs | 600 µs | |
- | |0ff|0n|0n| 500 µs | 1.25 ms | | + | |Off|On|On| 500 µs | 1.25 ms | |
- | |0n|0ff|0ff| 1 ms | 2.5 ms | | + | |On|Off|Off| 1 ms | 2.5 ms | |
- | |0n|0ff|0n| 2 ms | 5 ms | | + | |On|Off|On| 2 ms | 5 ms | |
- | |0n|On|0ff| 4 ms | 10 ms | | + | |On|On|Off| 4 ms | 10 ms | |
- | |0n|0n|0n| 8 ms | 20 ms | | + | |On|On|On| 8 ms | 20 ms | |
</ | </ | ||
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{{ : | {{ : | ||
+ | |||
+ | |||
+ | While it is infrequent, the D2-005 power supply may occasionally radiate noise from the side of its chassis onto nearby electronics. This only occurs in some system configurations, | ||
**Absolute Jump TTL (BNC)** | **Absolute Jump TTL (BNC)** | ||
- | When asserted HIGH (5V) while in LOCK mode, ABSOLUTE JUMP takes the Laser Servo out of lock and conveys the voltage on LASER JUMP AMPLITUDE to the SERVO OUTPUT. | + | When asserted HIGH (5V) while in LOCK mode, ABSOLUTE JUMP takes the Laser Servo out of lock and conveys |
- | When asserted HIGH (5V) while in RAMP mode, ABSOLULTE | + | When asserted HIGH (5V) while in RAMP mode, ABSOLUTE |
- | When disconnected, | + | When disconnected, |
**Relative Jump TTL (BNC)** | **Relative Jump TTL (BNC)** | ||
- | When asserted HIGH (5 V) while in LOCK mode, RELATIVE JUMP engages a sample-and-hold circuit and takes the Laser Servo out of lock. The voltage on the SERVO OUTPUT is the sample-and-hold value summed in with the LASER JUMP AMPLITUDE. For example, if the laser is locked and the SERVO OUTPUT is -200 mV, then engaging the RELATIVE JUMP and putting 300 mV on the LASER JUMP AMPLITUDE will make the SERVO OUTPUT | + | When asserted HIGH (5 V) while in LOCK mode, RELATIVE JUMP engages a sample-and-hold circuit and takes the Laser Servo out of lock. The voltage on the SERVO OUTPUT is the sample-and-hold value summed in with <color black/ |
When asserted HIGH (5V) while in RAMP mode, RELATIVE JUMP applies a DC offset equal to the LASER JUMP AMPLITUDE to the ramp signal at SERVO OUTPUT. When asserted LOW (0V) while in RAMP mode, the ramp signal is DC balanced. | When asserted HIGH (5V) while in RAMP mode, RELATIVE JUMP applies a DC offset equal to the LASER JUMP AMPLITUDE to the ramp signal at SERVO OUTPUT. When asserted LOW (0V) while in RAMP mode, the ramp signal is DC balanced. | ||
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If you are having problems locking the laser, it is a good idea to not use the AUXILIARY SERVO OUTPUT as this complicates the system. Once you get the locking to work properly, you can reconnect this cable. | If you are having problems locking the laser, it is a good idea to not use the AUXILIARY SERVO OUTPUT as this complicates the system. Once you get the locking to work properly, you can reconnect this cable. | ||
- | <imgref factory_settings> | + | <imgref factory_settings> |
<WRAP center round box 400px>< | <WRAP center round box 400px>< | ||
- | {{ {{ d2:d2-125:factory_settings.jpg? | + | {{ {{ d2:d2-125:factory_settings_red.png? |
+ | |||
+ | <WRAP center round box 60%>< | ||
+ | | **Corner** | ||
+ | | First Integrator (high freq.) | ||
+ | | First Integrator (low freq.) | ||
+ | | Second Integrator (high freq.) | ||
+ | | Second Integrator (low freq.) | ||
+ | | Differential (high freq.) | ||
+ | | Differential (low freq.) | ||
+ | |||
+ | </ | ||
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d2/laser_servo.1562973057.txt.gz · Last modified: 2021/08/26 14:26 (external edit)