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Entry  Fri Oct 26 16:57:30 2012, Jenne, Update, Alignment, PR2 aligned, PR3 mostly aligned 
    Reply  Sat Oct 27 23:13:12 2012, rana, Update, Alignment, alignment strategy 
Message ID: 7635     Entry time: Sat Oct 27 23:13:12 2012     In reply to: 7632
Author: rana 
Type: Update 
Category: Alignment 
Subject: alignment strategy 

 Maybe we have already discarded this idea, but why not do the alignment without the MC?

Just lock the green beam on the Yarm and then use the transmitted beam through the ITMY to line up the PRC and the PZTs? I think our estimate is that since the differential index of refraction from 532 to 1064 nm is less than 0.01, using the green should be OK. We can do the same with the Xarm and then do a final check using the MC beam.

In this way, all of the initial alignment can be done with green and require no laser Goggles (close the shutter on the PSL NPRO face).

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