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Entry  Wed Aug 6 10:45:56 2014, Gabriele, Update, ASC, POP QPD signals pop_qpd_2f.png
    Reply  Wed Aug 6 12:44:52 2014, Koji, Update, ASC, POP QPD signals 
Message ID: 10337     Entry time: Wed Aug 6 10:45:56 2014     Reply to this: 10338
Author: Gabriele 
Type: Update 
Category: ASC 
Subject: POP QPD signals 

 In addition to the simulation described in my previous elog, I simulated the signal on a quadrant photodetector demodulated at 2F. The input laser beam is modulated at 11MHz up to the fifth order. There is no additional 55 MHz modulation.

The QPD demodulated at 2F shows good signals for PRC control for all CARM offsets, as expected from the previous simulation.



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