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Diagram for the Lock Boxes used for all the saturated absorption locked lasers. There are 3 parts to the circuit. The first is a subtracter op amp circuit for the two photo diode signals. One signal will have the absorption, one will have the saturated absorption. The saturated absorption signal is more important and sometimes you don't even need the absorption signal.
An LM399 voltage reverence is used for the Lock in amplifier ref input. This determines the frequency that the Lock In Amplifier uses.
The locking part of the circuit takes the error signal from the lock in amplifier and puts it through a feed back circuit that goes to the piezo. W
[https://wiki.physics.wisc.edu/yavuz/images/9/90/LockBoxRbLasers.pdf Lock Box Circuit]
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