Manar and Ronic, end of day on the intervention of FP cavity

noise on the transmitted signal reduced and a stable lock of the cavity was obtained using CW laser.

FSR measured: 33.34MHz

data for measuring the Finesse of the cavity has taken to be analyzed: Finesse = 4200 !!! (Finesse was 17000 before...)

Note: if needed more details on the ThomX FP logBook