You're welcome.

The input power is 30 mW and can indeed be tweaked with the HWP.

Also, the lockin amplifier settings have not been changed yet.

For the photodiode powersupply we will take the one used for the 1310 nm beam I think.

For the PSDs, one is now used in FC experiment so only one is available.

It seems that with the 100 mm focal length lens, the beam is small enough for the photodiode. And we can also tune their gain.