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Entry  Tue Jan 7 23:24:41 2014, Jenne, Update, General, IFO plan, list o' things to do 
    Reply  Wed Jan 8 13:46:39 2014, Jenne, Update, General, IFO plan, PRM baffle PRMcage_6Sept2012.JPG
    Reply  Wed Jan 8 17:53:26 2014, manasa, Update, General, IFO plan, IPANG telescope IPANG_layout.pngIPANG.png
       Reply  Thu Jan 9 17:21:45 2014, rana, Update, General, IFO plan, IPANG telescope 
    Reply  Thu Jan 9 10:34:58 2014, Steve, Update, PSL, PSL pointing changes in pitch Lfnfdnc.png24hPSLpointing.png
       Reply  Fri Jan 10 10:28:03 2014, Steve, Update, PSL, PSL pointing changes  clamped.png
Message ID: 9540     Entry time: Wed Jan 8 17:53:26 2014     In reply to: 9534     Reply to this: 9543
Author: manasa 
Type: Update 
Category: General 
Subject: IFO plan, IPANG telescope 

For the IPANG telescope design, we are in the 'beyond the Rayleigh range' regime. So using a single lens to make the beam small is not a great idea. I have put down a solution where we use a pair of lenses; one of which will be mounted in-vacuum in the ETMY chamber and the other on the endtable.
This way we will also allow have some freedom to configure the layout out-of vacuum in case the need arises. The layout will look something like in the cartoon:
IPANG_layout.png

I also made a choice of using longer focal length lenses (CVI 2" lenses f =1 m). Below is the beam path summary for IPANG telescope. I have used the waist diameter at the ITM for propagation. The endtable is roughly at 41.2m. The QPD will be placed in front of the waist (w0=47um).
IPANG.png 

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