The laser power incident on the IMC was increased to 1 W per WP3869.
It will stay at this power level during HIFO.

Preparation
In preparation to increase the power I did the following things:

•  Removed a beam dump which had been in the main PSL path right after the EOM on the PSL table.

This dump was something people put to block the beam during the high power adjustment in the last two days.

• Measured the power of the main PSL

After the EOM = 1.203 W

In front of the bottom periscope mirror = 167.7 mW
(This was then increased to 1.00 W)

• Measured laser power on the IOT2L to make sure that increasing the power doesn't damage the diodes.

Note that I intentionally misaligned MC2 during the measurement on IOT2L by disabling the pitch offset of 407 urad in M1.

This was because I wanted to avoid fringing in the reflected light.

Adjustments.

  The incident power onto the IMC was adjusted to be 1 W by rotating the half-wave-plate in the last attenuation stage in front of the PSL periscope. Note that this rotational stage doesn't give us more than 1.2 W since the power is already limited by another attenuator in the upstream. Then I checked the power on the diodes on IOT2L to make sure they are working OK with the new power level. The power were measured to be :

Length RFPF = 9.3 mW
WFS A = 6 mW
WFS B = 13.6 mW

All of them show reasonably big DC signals in the digital system and seems fine although I didn't check the RF signals yet.