I worked on alignment for double-pass AOM with scanning frequency.
Since I have not prepared QPD yet, I used beam profiler to monitor the beam position.
Still the double-passed beam has beam jitter and need more optimization.

It should be noted that the input inpedance of frequency tuning is 1kOhm so that the actual input voltage from function generator which output inpedance is 50Ohm is doubled.
Tunable frequency range is 50-100MHz and it corresponds to +1.5 to +15V (+0.75V to +7.5V on display).

The attached is SMC connector  to input voltage for frequency tuning.