Status update on dichroic mirror:
I got the specification sheet of an aLIGO 2" dichroic mirror from Lisa.
This is the one from ATF. It has low loss, a high R for 1064 nm and high T for 532 nm. So it matches our needs.
Based on this sheet we may reset some of the parameters in the specification (e.g. incident angle and etc.,) and will get a quote from ATF.
We will buy 3 of them, including 1 spare. First I need to review the specification.