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Entry  Fri Apr 12 02:56:34 2013, Den, Update, Locking, prcl angular motion pointing.pngoplev_exc.pdf
    Reply  Fri Apr 12 09:20:32 2013, rana, Update, Locking, prcl angular motion 
       Reply  Fri Apr 12 13:21:34 2013, Den, Update, Locking, prcl angular motion 
          Reply  Sat Apr 13 03:45:51 2013, rana, Update, Locking, prcl angular motion 
             Reply  Sat Apr 13 23:11:04 2013, Den, Update, Locking, prcl angular motion pointing.pdf
                Reply  Sun Apr 14 17:56:03 2013, rana, Update, Locking, prcl angular motion 
                Reply  Mon May 13 18:44:04 2013, Jenne, Update, Locking, prcl angular motion TT_Q_measurements.pdf
Message ID: 8450     Entry time: Sat Apr 13 03:45:51 2013     In reply to: 8449     Reply to this: 8451
Author: rana 
Type: Update 
Category: Locking 
Subject: prcl angular motion 

 

 Maybe its equivalent, but I would have assumed that the input beam is fixed and then calculate the cavity axis rotation and translation. If its small, then the modal expansion is OK. Otherwise, the overlap integral can be used.

For the ETM motion, its a purely translation effect, whereas its tilt for the ITM. For the PRM, it is also a mostly translation effect as calculated at the PRC waist position (ITM face).

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