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Beam size and finesse, posted by Loīc Amoudry at Optical room about lasers and optics

Message ID: 103 Entry time: Fri Nov 6 14:23:16 2020 In reply to: 18

Measurement behind P4 (planar mirror)

Loïc Amoudry wrote:

FSR initiale : 33.34 MHz (S3 = -825000 et S4 = -825000)

Beam size initiale : wx=2.05mm et wy=2.15mm

Finesse initiale : 3400

FSR après éloignement des miroirs sphériques : 33.29 MHz (S3 ~= -1496000 et S4 ~= -1496000)

Beam size : wx=1.7mm et wy=1.85mm

Finesse : 3600

FSR après rapprochement des miroirs sphériques : 33.39 MHz (S3 ~= -250000 et S4 ~= -500000)

Beam size : wx = 2.1mm et wy=2.4mm

Fit de la caméra jamais au dessus de 90%. ~~80%.