The power stabilisation was worked on today.  No real success to speak of.
The offset for the AOM drive signal was adjusted to diffract ~5W of light.

The servo was intermittent at low frequencies.  Examination of the photodiode
monitor signals showed changes in level at low frequencies.  This might be due
to interference between the main beam of the laser and some junk light from the
laser, even though the photodiodes are located after the pre-modecleaner.  The
symptoms seem to be eased when the pre-modecleaner servo gain was reduced.
However doing that reduces the unity gain of the pre-modecleaner servo.

We will take another look at the output of the laser tomorrow.




Jason, Peter