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Entry  Tue Apr 6 11:51:15 2010, Koji, Laser, Doubling, MZ lock response.pngoltf.png
    Reply  Wed Apr 7 21:29:48 2010, Dmass, Laser, Doubling, MZ lock 
Message ID: 720     Entry time: Wed Apr 7 21:29:48 2010     In reply to: 715
Author: Dmass 
Type: Laser 
Category: Doubling 
Subject: MZ lock 

I kidnapped Mott and was working on closing the ISS loop, but saw some funny things which I didn't understand.

  • We saw a strange rail to rail flipping of ISS err, and I traced it upstream, eventually to the ISS PD box. I somehow was causing the ISS PD box output to flip rail to rail for the channel which I didn't have plugged into my circuit. I need to write down the connection states, and understanding this may be immediately clear.
  • With one arm blocked, and the box off, there were these ~3Hz glitches in the PDs for the MZ. I believe the problem to be downstream of the PMC. I tried to close the ISS loop, but am unsure where I was going wrong. I will tackle this again later.
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