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Entry  Wed Mar 20 14:44:47 2013, Jamie, Update, Optics, updated calculations of PRC/SRC g-factors and ARM mode matching 
    Reply  Mon Mar 25 16:51:59 2013, Jenne, Update, Optics, updated calculations of PRC/SRC g-factors and ARM mode matching 
    Reply  Tue Mar 26 11:33:55 2013, Jamie, Update, Optics, HOWTO calculate effective RoC of flipped TT mirror.mtransmission.mTTflipped.mM2Reff.m
Message ID: 8316     Entry time: Wed Mar 20 14:44:47 2013     Reply to this: 8339   8352
Author: Jamie 
Type: Update 
Category: Optics 
Subject: updated calculations of PRC/SRC g-factors and ARM mode matching 

Below are new alamode calculations of the PRC and SRC g-factors and arm mode matchings.  These include fixes to the ABCD matrices for the flipped folding mirrors that properly (hopefully) take into account the focusing effect of passing through the optic substrates.

I've used nominal curvatures of -600 m for the G&H PR2/SR2 optics, and -700 m for the Laseroptik PR3/SR3 dichroics.

An interesting and slightly disappointing note is that it looks like it actually would have been better to flip PR3 instead of PR2, although the difference isn't too big.  We should considering flipping SR3 instead or SR2 when dealing with the SRC.  I'll take responsibility for messing up the calculation for the flipped TTs.

PRC

PR2 Reff PR3 Reff PRC g-factor (t/s) ARM mode matching
Inf Inf .94/.94 .999
-600 -700 .99/.98 .84
413 (flipped) -700 .94/.93 .999
-600 409 (flipped) .92/.94 .999
413 (flipped) 409 (flipped) .87/.89 .97

SRC

SR2 Reff SR3 Reff SRC g-factor (t/s) ARM mode matching
Inf Inf .96/.96 .999
-600 -700 NA NA
413 (flipped) -700 .96/.95 .998
-600 391 (flipped) .94/.96 .996
413 (flipped) 391 (flipped) .90/.92 .96

RXA: maybe nominal, but we don't actually have measurements of the installed optics' curvatures, so there could be ~10-15% errors in the RoC. Which translates into a 1-2% error in the g-factor.

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