With Sotatsu

Today we measure the beam profile of AS table external laser. According the fitting plot (Fig.1), the beam waist is around 457um, that is a bit  larger than the design beam waist size 421um.
 And the waist position is 2.12m far from the start point， the distance between OCM and the start point (except  the distance of periscope) is around 2m, so the length is roughly ok.

Tomorrow morning we will discuss if we should improve the beam profile before 2 PM OMC meeting.