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Entry  Tue Nov 8 18:51:38 2011, tara, DailyProgress, optic, optics for RFAM IMG_2186_ACAV.jpgIMG_2187_RCAV.jpg
    Reply  Tue Nov 29 01:50:40 2011, tara, DailyProgress, optic, optics for RFAM RFPD_setup.jpg
Message ID: 726     Entry time: Tue Nov 8 18:51:38 2011     Reply to this: 739
Author: tara 
Type: DailyProgress 
Category: optic 
Subject: optics for RFAM 

I added mirrors to pick up stray beams just before the cavities. These beams will be used for monitoring RFAM.

    I arranged the optics so that stray beams at the beam splitters (just in front of the cavities) could be used. The power of the beam is ~ 9 uW, but it can be increased by changing the polarization of the input beam later.

     Two photodiodes are needed, I haven't checked yet if I still have some spare PDs left.

     Then the signal from PD will be demodulated with 35.5 MHz signal (modulation frequency). The cable length + PD position will be adjusted so that the phase is the same as the PDH signal.




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