d2:laser_servo
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d2:laser_servo [2018/11/14 17:38] – [Right Side Panel] Michael Radunsky | d2:laser_servo [2018/11/19 17:18] – [Table] Michael Radunsky | ||
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=====Specifications===== | =====Specifications===== | ||
<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)) |
- | |**Max Input Voltage DC Level**| | + | | **Max Input Voltage DC Level** |
- | |**Max Input Voltage Signal Amplitude**| | + | | **Max Input Voltage Signal Amplitude** |
- | |**Bandwidth**(( Oscillation frequency when Laser Servo locked to itself in proportional mode.))| | + | | **Bandwidth**(( Oscillation frequency when Laser Servo locked to itself in proportional mode.)) |
- | |**Proportional Gain (ref to DC Error)**\\ **Proportional Gain (ref to Input Error)**| | + | | **Proportional Gain (ref to DC Error)**\\ **Proportional Gain (ref to Input Error)** |
- | |**First Integrator**| | + | | **First Integrator** |
- | |**Second Integrator**| | + | | **Second Integrator** |
- | |**Differential**| | + | | **Differential** |
- | |**Differential Gain**| | + | | **Differential Gain** |
- | |**Auxiliary Servo Output | + | | **Auxiliary Servo Output |
- | |**Laser Freq. Jump**| | + | | **Laser Freq. Jump** |
- | |** Jump Time**| | + | | ** Jump Time** |
- | |**Ramp Amplitude (Max)**| | + | | **Ramp Amplitude (Max)** |
- | |**Ramp Frequency (on main servo output) \\ Ramp Frequency (on aux servo output)**| | + | | **Ramp Frequency (on main servo output) \\ Ramp Frequency (on aux servo output)** |
- | |**Dither Frequency (-PL only)**| | + | | **Dither Frequency (-PL only)** |
- | |**RF Output Max Amplitude (-PL only)**| | + | | **RF Output Max Amplitude (-PL only)** |
- | |**RF Output Impedance (-PL only)((Into a 1 MΩ load)) **| 50 | Ω | | + | | **RF Output Impedance (-PL only)((Into a 1 MΩ load)) ** | 50 | Ω | |
- | |**Ramp Centering Range **| ±5 | V | | + | | **Ramp Centering Range ** | ±5 | V | |
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**Coarse Gain (seven-position switch)** | **Coarse Gain (seven-position switch)** | ||
- | The COARSE GAIN sets the overall proportional gain of the circuit without changing the location of any zeros or poles in the loop filter transfer function. | + | The COARSE GAIN sets the overall proportional gain of the circuit without changing the location of any corners |
The overall loop gain (controlled by both the COARSE GAIN and the FINE GAIN) should be set around the point that minimizes the RMS noise on the DC ERROR MONITOR. This can sometimes result in setting the gain too high because the DC ERROR MONITOR filters high frequencies and thus hides some of the gain peaking with high gain. To precisely set the gain, look at the noise with a spectrum analyzer through the AC ERROR MONITOR. | The overall loop gain (controlled by both the COARSE GAIN and the FINE GAIN) should be set around the point that minimizes the RMS noise on the DC ERROR MONITOR. This can sometimes result in setting the gain too high because the DC ERROR MONITOR filters high frequencies and thus hides some of the gain peaking with high gain. To precisely set the gain, look at the noise with a spectrum analyzer through the AC ERROR MONITOR. |
d2/laser_servo.txt · Last modified: 2021/12/17 01:58 by 127.0.0.1