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Entry  Fri May 6 14:20:43 2016, Gabriele, Electronics, Design, Design of optical lever electronics  qpd.PDFBreakout.PDF
    Reply  Sun May 8 13:35:04 2016, rana, Electronics, Design, Design of optical lever electronics  
       Reply  Tue May 10 13:32:17 2016, Gabriele, Electronics, Design, Design of optical lever electronics  
Message ID: 12     Entry time: Sun May 8 13:35:04 2016     In reply to: 11     Reply to this: 13
Author: rana 
Type: Electronics 
Category: Design 
Subject: Design of optical lever electronics  

Koji, Rich, and I recently came up with a new QPD design which is better for general lab use than the aLIGO ones (which have a high-noise preamp copied from iLIGO). 

https://dcc.ligo.org/LIGO-D1500467

This page has the mechanical drawing only, but perhaps Rich can tell us if he's ready to make the first version for you or not. I think you can get by with the old design, but this new one should be lower noise for low light levels.

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