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 Wed Feb 4 17:45:39 2009, Yoichi, Update, General, Mode matching of the upgraded IFO
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 Wed Feb 4 19:22:57 2009, Yoichi, Update, General, Do we need off-axis parabolic mirrors ?
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Thu Feb 5 10:42:33 2009, Yoichi, Update, General, Do we need off-axis parabolic mirrors ? No way !
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Message ID: 1271
Entry time: Wed Feb 4 17:45:39 2009
Reply to this: 1272
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| Author: |
Yoichi |
| Type: |
Update |
| Category: |
General |
| Subject: |
Mode matching of the upgraded IFO |
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I did mode matching calculations for the new optical layout.
For the input mode matching, we have to change the focal length of the second mirror from 687mm to 315mm and the distance between the two MMT mirrors from 137mm to 149.2mm.
For the mode matching to the OMC, we only have to change the distance between the OMMT mirrors from 384mm to 391mm. No need to change the mirrors.
Details of the calculations can be found in
http://lhocds.ligo-wa.caltech.edu:8000/40m/Upgrade_08/Optical_Layout?action=AttachFile&do=get&target=NewRecyclingCavities.zip
(Mathematica notebook)
or if you prefer PDF, here
http://lhocds.ligo-wa.caltech.edu:8000/40m/Upgrade_08/Optical_Layout?action=AttachFile&do=get&target=NewRecCav.pdf |