Laser Lock Box : When and how should I use the slow PID controller?
Moku:Lab fast and slow PID controllers
Written by Paul Cracknell
Updated at September 8th, 2024
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Moku:Go
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Moku:Lab
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Moku:Pro
Moku:Pro Arbitrary Waveform Generator Moku:Pro Data Logger Moku:Pro Frequency Response Analyzer Moku:Pro Oscilloscope Moku:Pro PID Controller Moku:Pro Spectrum Analyzer Moku:Pro Waveform Generator Moku:Pro Lock-in Amplifier Moku:Pro Digital Filter Box Moku:Pro FIR Filter Builder Moku:Pro Phasemeter Moku:Pro Multi-instrument Mode Moku:Pro General Moku:Pro Logic Analyzer/Pattern Generator Moku:Pro Time & Frequency Analyzer
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When stabilizing lasers, it is common to need to provide feedback control loops to multiple actuators.
A common situation involves one fast actuator with limited range (e.g. current or piezo); and one slow actuator with a much larger range (e.g. temperature).
The slow PID controller acts on the fast PID controller’s output, keeping it centered around zero and thus maximizing the dynamic range for the fast feedback control.