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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: 10338     Entry time: Wed Aug 6 12:44:52 2014     In reply to: 10337
Author: Koji 
Type: Update 
Category: ASC 
Subject: POP QPD signals 

This is nice. Can we test this idea with POP22 + a razor blade?

Just to take transfer functions in PRMIsb between the PRM angle to POP QPD/POP22+razor blade
as well as the noise spectrum measurement are already useful.

We want to figure out the requirement for the 2f QPD.
(Transimpedance / Noise level / Beam size / etc)

Depending on the requirement we'll see if we need demodulation or just a power detector.

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