Alexei, Dan Brown

We did some beam profiling measurements of the SRM heater to determine how far away the table should be positioned from the ZnSe viewport and if the beam sizes are correct. To take beam profiles of the CO2 we used a knife edge and a power meter. The measurements were compared to a simple model of the setup which matches up well. The aim was to get around a 5mm radius at the SRM, which we can achieve if we position the table so the top of the periscope is about 1m from viewport.

Measurements and analysis can be found in:

https://git.ligo.org/IFOsim/Finesse_playground/blob/master/daniel_brown/LHO/CO2_knife_edge.ipynb