The nominal value of the squeezer laser diode current was change to 1.863 from 1.95. The tolerance is unchanged at 0.1. Looking at trends we sometimes read a value just below 1.85 leading to a failed laser condition which in turn triggers a relocking of the squeezer laser. However, since we are already locked, all we see is the fast and commen gains ramping down and up.
Looking at this diode current trend over the past 500 days, we see it fairly stable but trending down very slowly. It may have lost 10 mA over the past year. Resetting the nominal value should keep us in the good band for a while if this trend continues.
So far this seems to have fixed the TTFSS gain changing issue! Haven't seen gain changes while locked in the past couple days, since Daniel changed the laser diode nominal current (bottom purple trend).
In the past week there wasn't single TTFSS gain ramping incident during lock. The fast and common gains are again monitored in SDF.
