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| ## page was renamed from Upgrade 08/Optics | ## page was renamed from Upgrade 09/Optics <<TableOfContents(2)>> |
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| == Substrate Material == | ------ = ►Folding mirrors = We use 2inch mirrors (d2" x t3/8") mirrors for the PRC/SRC folding mirrors. |
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| The material of the substrate is Corning 7980 Fused Silica, grade UV-0A. | Their name has been changed such that the definition agrees with the AdvLIGO naming. (12/01/2009) |
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| [http://www.corning.com/docs/specialtymaterials/pisheets/H0607_hpfs_Standard_ProductSheet.pdf Here] is the link to the data sheet of Corning 7980. == Coatings and Optics == This is a work in progress area for what optic and coatings we need. || Parameter || ITMs || ETMs || PRM || SRM || FM (4x) || || HR Transmission 1064 nm || 0.014 * || 10 ppm ||0.055 +/-0.003 ||0.10 +/- 0.005 || <0.01 || || HR Transmission 532 nm || < 1000 ppm || 0.10 ||n/a ||n/a ||n.r. || || AR Reflection 1064 nm || < 1000 ppm || < 100 ppm ||< 300 ppm ||< 300 ppm || <0.01 || || AR Reflection 532 nm || <0.01 || < 1000 ppm ||n/a ||n/a || || || ROC || Flat (>5 km) || 57.5 m? ||115.5 96.3 +50/-0 (96**) || 142 117.1+50/-20 (116.3**) || inf || || Wedge angle || 1 deg (+/- 0.2 deg) || 1 deg ||1 deg ||1 deg ||1 deg || [[BR]][[BR]]*''T_ITMnom = 0.014 +/- 0.002. All 3 ITMs in the same coating run to match the T, i.e. T_ITMY - T_ITMX < 0.0003. Tolerance in T_ITMnom is larger.''** Based on ETM and ITM ROC, assuming inf. thin optics. ---- . Draft zip file of specs in .doc format: attachment:40mCOC-080723.zip (need to change the ext to .doc) . Also in [attachment:40mCOC-080723.pdf PDF] ---- . Specs of the folding mirrors for the recycling cavities || Name || PR1 || PR2 || SR1 || SR2 || |
== Specs of the folding mirrors (as of Dec 16, 2009) == || Name || PR2 || PR3 || SR3 || SR2 || |
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| || Incident angle || 2.5 deg || 36.5 deg || 39.9 deg || 17.1 deg || | || Incident angle || 2.5 deg || 36.5 deg || 44 deg || 6 deg || |
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| . [[Upgrade 08/Optics/RCParams|Considerations on the parameters of PRC/SRC]] | '''R for 532nm to be considered!''' |
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| ---- | <!> At the installation in 2010, G&H HR mirrors were used for the TT mirrors. This results very little transmission through those mirrorrs (<25ppm). |
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| '''Communication between ATF and Coastline''' | ------ |
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| {{{ From: Gene Lapp Sent: Tuesday, July 28, 2009 4:00 PM To: Ramin Lalezari Cc: Vern Korn; John Tardif (E-mail) Subject: Power Recycling Mirrors / Signal Recycling Mirrors |
= ►Miscellaneous Optics (as of May 12, 2010) = |
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| Ramin, | [[Upgrade 09/Optics/RTmeasurement|Reflectivity and Transmissivity measurement for various mirrors with 523nm and 1064nm]] |
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| I've run across another small problem with the Power Recycling & Signal Recycling Mirrors. The wedge angle is called out as 2° 30' ± 5'. The parts are measuring between 2° 40' and 2° 44' (all ± 0.5'). We have traced this problem to an error in our wedge tool, which is nominally at 2° 40'. | [[Upgrade 09/Optical Layout|Optical Layout]] |
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| All the mirrors have been measured except for one Signal Recycling Mirror (currently on the polishing machine). I expect that it will be in the same condition. The measurements are as follows: | attachment:40m_optics_list_upgrade_100512.png |
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| PRMU01 2° 40' PRMU02 2° 42' PRMU03 2° 43' PRMU04 2° 40' (extra) |
attachment:40m_optics_list_upgrade_100512.pdf |
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| SRMU01 - SRMU02 2° 41' SRMU03 2° 41' SRMU04 2° 44' (extra) }}} ---- Data sheets from ATF on 40m svn [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/Data_Sheet_sent_by_ATF/] |
attachment:40m_optics_list_upgrade_100512.xls |
Contents
►Folding mirrors
We use 2inch mirrors (d2" x t3/8") mirrors for the PRC/SRC folding mirrors.
Their name has been changed such that the definition agrees with the AdvLIGO naming. (12/01/2009)
Specs of the folding mirrors (as of Dec 16, 2009)
Name |
PR2 |
PR3 |
SR3 |
SR2 |
Size |
2"dia. X 3/8" thick |
2"dia. X 3/8" thick |
2"dia. X 3/8" thick |
2"dia. X 3/8" thick |
Incident angle |
2.5 deg |
36.5 deg |
44 deg |
6 deg |
HR Transmission 1064 nm |
500ppm |
< 100 ppm |
< 100ppm |
< 100ppm |
AR Reflection 1064 nm |
< 0.25% |
< 0.25% |
< 0.25% |
< 0.25% |
ROC |
Flat |
Flat |
Flat |
Flat |
Wedge angle |
1 deg |
1 deg |
1 deg |
1 deg |
Qty. |
2 |
2 |
2 |
2 |
R for 532nm to be considered!
At the installation in 2010, G&H HR mirrors were used for the TT mirrors. This results very little transmission through those mirrorrs (<25ppm).
►Miscellaneous Optics (as of May 12, 2010)
Reflectivity and Transmissivity measurement for various mirrors with 523nm and 1064nm
attachment:40m_optics_list_upgrade_100512.png
attachment:40m_optics_list_upgrade_100512.pdf
attachment:40m_optics_list_upgrade_100512.xls