Modules for Laser Frequency Locking

The BR Labs servo controller is designed to be used in feedback systems (closed loop) for locking lasers to optical cavities (or the opposite), or to atomic or molecular resonances, using mirrors mounted on piezo-stacks. It comprises a piezo driver combined with a loop filter, which can also be used independently.
The piezo driver provides positive voltage outputs up to 150 V. It includes three independent inputs (“error signal”, “bias”, “modulation” and “sweep”), an offset control, a monitor output (0 to +15 V) and main output (0 to +150 V).
The loop filter includes proportional gain adjustments (course and fine), and bandwidth adjustments to allow stable operation with a variety of actuators of different resonance frequencies and gains. A polarity switch allows easy adjustment of the error signal sign.

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