## page was renamed from Upgrade 09/Optics <> ------ = ►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) == New PR3/SR3 mirrors (delivered Feb 7th, 2019) == '''Design Specification''' [[https://dcc.ligo.org/LIGO-E1800089 | E1800089]] * RoC = 1000 m +/- 150 m * Sagitta = 0.323 um * Diameter 2" x Thickness 10 mm 2deg wedge (horizontal) * Super polish <1 angstrom RMS * Coating S1: AOI 40-45 @41.1 T<50ppm@1064nm, p-pol * Arrow marking at the thickest side '''Specification of the delivered optics''' '''Substrate Spec:''' [[attachment:AdvancedGlassIndustries.pdf]] '''Polish Spec:''' [[attachment:CoastlineOptics.pdf]] || Serial || S1 RoC || S1 RMS || S2 RoC || S2 RMS || || REV 7-1 || -976.7 m || 0.69 Å || 31091.0 m || 0.37 Å || || REV 7-2 || -1002.0 m || 0.40 Å || 21079.3 m || 0.41 Å || || REV 7-3 || -1002.6 m || 0.83 Å || 18876.4 m || 0.38 Å || || REV 7-4 || -1023.8 m || 0.38 Å || 10855.1 m || 0.74 Å || || REV 7-5 || -1004.6 m || 0.49 Å || 9556.2 m || 0.71 Å || '''Coating Spec:''' [[attachment:FiveNineOptics.pdf]] * S1 T: P-pol 40deg 35.1 ppm / 45deg 94.1 ppm * S2 R: P-pol 40deg 889.1 ppm / 45deg 245.3 ppm Zernike Polynomial Z,,2,,^0^ = 1-2 rho^2^, where rho is the normalized radius (rho = r/r,,0,,). Define z,,2,,^0^ as the coefficient for this term. ("Power" in Zygo data is defined as zygo = 2*z,,2,,^0^) Sphere z=(R^2^-r^2^)^1/2^ => R [1- (r/R)^2^/2] for a small r. Comparing the second order terms, we obtain: zygo/ r,,0,, = 1/(2 R) => R = -r,,0,,^2/2/z,,2,,^0^ Use r,,0=40.64mm/2 and Lambda = 633nm => '''R=326.147/zygo''' where R is RoC || Serial || S1 RoC || S2 RoC || || REV 7-1 || 0.354 λ => -921 m || -0.028 λ => 12 km || || REV 7-2 || 0.337 λ => -968 m || -0.024 λ => 14 km || || REV 7-3 || 0.339 λ => -962 m || -0.041 λ => 8.0 km || || REV 7-4 || 0.330 λ => -988 m || -0.044 λ => 7.4 km || || REV 7-5 || 0.349 λ => -935 m || -0.047 λ => 6.9 km || == 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). ------ == 2" Dichroic Recycling Cavity Mirrors from Laseroptik, measurement data of 06-29-2012 == [[attachment:26062ke2_HT532nms+p_HR1064nmp39-48°.pdf]] [[attachment:25062ke1_AR532nms+p+1064nmp39-48°.pdf]] [[attachment:25062ke1_AR532nms+p+1064nmp39-48°.pdf]] [[attachment:B-09458.pdf]] [[attachment:B-09465.pdf]] --------- == Gooch & Housego 2" & 1" mirrors 03/15/2010 == [[attachment:G&H_2"_1064HR_0-45dinc.pdf]] [[attachment:photo 1.JPG]] [[attachment:photo 2.JPG]] ---------- == CVI 2" Stock Beamsplitters == [[attachment:BS1-1064-95-2025-45UNP.png]] Note: Red is S-Pol., Blue is P-Pol. ---------- = ►Miscellaneous Optics (as of May 12, 2010) = [[Upgrade_09/Optics/RTmeasurement|Reflectivity and Transmissivity measurement for various mirrors with 523nm and 1064nm]] [[Optical_Layout]] {{attachment:40m_optics_list_upgrade_101214.png}} [[attachment:40m_optics_list_upgrade_101214.pdf]] [[attachment:40m_optics_list_upgrade_101214.xls]] ------------- == 6.5" Window Specs for Optical Table Enclosure and Vacuum, March 2013 == WINDOW SPECS FOR OPTICAL TABLE ENCLOUSER and VACUUM VIEW PORT AT 40M We changed some details, look carefully. Please quote us as shown below for 4 pieces of large windows and 5 pieces of 1" diameter mirrors Window specs I. Fabricate 1. material BK-7, grade A 2. diameter 6.5" + - 0.02", 3. thickness 1" + - 0.02", 4. wedge 2 degrees 5. bevel both sides ~ 0.04" 6. surface quality 10-5 7. flatness 1/4 wave 8. meet specs on central 5.5" II. AR Coating 1. R < 0.2% at 532 and 1064 nm 2. incident angles 0-10 degrees on both sides 3. over the central 5" diameter 4. coat witness plates as shown below III, Verify 1. verify the specs via measurement before shipping 2. identify coating processes IV, small mirrors (witness plates for 6.5" window coating run) 5 pieces 1. material BK-7, grade A 2. diameter 1", 0.25" thick minimum 3. wedge 1 degree 4. surface quality 10-5 5. coat one side only 6. use same coating run as 6.5" windows [[ Laseroptics insisted using FUSED SILICA on these quotes ]] [[attachment:Laseroptic_Quote_6.5"_Windows.pdf]] [[attachment:Laseroptic_Quote_6.5"_Windows_spectrum.pdf]] [[attachment:6.5"_Cascade_Quote_#2.pdf]]