this afternoon, I added the Gain = 2.8 amplifier at the output of the Laselock to drive the laser PZT.
the power supply of the board is disymetric to address the correct maximal dynamic range of the amplifier (~ 30V) and voltage drop (~ 2V) related to the power supply voltage.
so, the power supply is set to -2V / 32V which gives roughly 0-28V of dynamic range at the ouput for 0-10V at the input.

despite the additionnal noise added by the amplifier, we are able to lock easily, and reach ~ 93kW in the FPC for 33% amplifier ratio.
obviously, as the dynamic range of this PZT has been multiplied by ~3, it is much more comfortable to operate the motors.
but the overall stability seems a bit degraded... to be checked, as finding the right PID + fast loop gain is not easy.

=> to be done tomorow.