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Entry   Finesse measurement, posted by Alice Renaux at Optical room about lasers and optics Figure_3.png
    Reply   Finesse measurement, posted by Alice Renaux at Optical room about lasers and optics 
Message ID: 243     Entry time: Thu Sep 4 17:56:50 2025     In reply to: 242
 Author: Alice Renaux 
 Status: Under Process 
 Type: report 
 Category: lasers and optics 
 Location: Optical room 
 Title: Finesse measurement 

(Finesse 2651 is consistent with that obtained from the mirrors' transmission coefficients, which is about 3100.)

Alice Renaux wrote:

Today, with Ronic, we measured the finesse of the 2-mirror cavity witht the NKT CW laser.

We were able to perfrom the measurement only once, and the results of the measurement are attached to this note. We added sidebands to the laser spectrum peak thanks to an EOM, and we sweeped the modulation frequency on a 1MHz span around an estimated FSR of 216.63MHz in 10s. We found a 82kHz linewidth, hence a finesse of 2651.

 

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