Differences between revisions 28 and 113 (spanning 85 versions)

Contents

►Folding mirrors
►Miscellaneous Optics (as of May 12, 2010)
1. 6.5" Window Specs for Optical Table Enclosure and Vacuum, March 2013

►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 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: AdvancedGlassIndustries.pdf

Polish Spec: 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: 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 Z₂⁰ = 1-2 rho², where rho is the normalized radius (rho = r/r₀). Define z₂⁰ as the coefficient for this term. ("Power" in Zygo data is defined as zygo = 2*z₂⁰)

Sphere z=(R²-r²)^1/2 => R [1- (r/R)²/2] for a small r.

Comparing the second order terms, we obtain: zygo/ r₀ = 1/(2 R) => R = -r₀^2/2/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

26062ke2_HT532nms+p_HR1064nmp39-48°.pdf
25062ke1_AR532nms+p+1064nmp39-48°.pdf
25062ke1_AR532nms+p+1064nmp39-48°.pdf
B-09458.pdf
B-09465.pdf

Gooch & Housego 2" & 1" mirrors 03/15/2010

G&H_2"_1064HR_0-45dinc.pdf
- photo 1.JPG
  - photo 2.JPG

CVI 2" Stock Beamsplitters

BS1-1064-95-2025-45UNP.png Note: Red is S-Pol., Blue is P-Pol.

►Miscellaneous Optics (as of May 12, 2010)

Reflectivity and Transmissivity measurement for various mirrors with 523nm and 1064nm

Optical_Layout

40m_optics_list_upgrade_101214.pdf

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

material BK-7, grade A
diameter 6.5" + - 0.02",
thickness 1" + - 0.02",
wedge 2 degrees
bevel both sides ~ 0.04"
surface quality 10-5
flatness 1/4 wave
meet specs on central 5.5"

II. AR Coating

R < 0.2% at 532 and 1064 nm
incident angles 0-10 degrees on both sides
over the central 5" diameter
coat witness plates as shown below

III, Verify

verify the specs via measurement before shipping
identify coating processes

IV, small mirrors (witness plates for 6.5" window coating run) 5 pieces

material BK-7, grade A
diameter 1", 0.25" thick minimum
wedge 1 degree
surface quality 10-5
coat one side only
use same coating run as 6.5" windows
- Laseroptics insisted using FUSED SILICA on these quotes Laseroptic_Quote_6.5"_Windows.pdf Laseroptic_Quote_6.5"_Windows_spectrum.pdf
  6.5"_Cascade_Quote_#2.pdf

-  ⇤ ← Revision 28 as of 2009-10-06 20:00:51 → 
  Size: 2597
  Editor: KojiArai
  Comment:
+   ← Revision 113 as of 2019-02-11 17:51:04 → ⇥
  Size: 5316
  Editor: GautamvenugopalanATligoDOTorg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-## page was renamed from Upgrade 08/Optics
== Coatings and Optics ==
This is a work in progress area for what optic and coatings we need.
+## page was renamed from Upgrade 09/Optics
<<TableOfContents(2)>>
-Line 5:
+Line 4:
-|| 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 ||
+------
= ►Folding mirrors =
-Line 14:
+Line 8:
-[[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 [javascript:void(0);/*1254859239474*/ [PDF]]
+We use 2inch mirrors (d2" x t3/8") mirrors for the PRC/SRC folding mirrors.
-Line 19:
+Line 10:
-----
 . Specs of the folding mirrors for the recycling cavities
+Their name has been changed such that the definition agrees with the AdvLIGO naming. (12/01/2009)
-Line 22:
+Line 12:
-|| Name || PR1 || PR2 || SR1 || SR2 ||
+== 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 ||
-Line 24:
+Line 59:
-|| 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 ||
-Line 32:
+Line 67:
-----
 . [[Upgrade 08/Optics/RCParams|Considerations on the parameters of PRC/SRC]]
-Line 35:
+Line 68:
-'''Communication between ATF and Coastline'''
-Line 37:
+Line 69:
-{{{
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
-Line 43:
+Line 70:
-Ramin,
-Line 45:
+Line 71:
-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'.
+'''R for 532nm to be considered!'''
-Line 47:
+Line 73:
-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:
+<!> At the installation in 2010, G&H HR mirrors were used for the TT mirrors. This results very little transmission through those mirrorrs (<25ppm).
-Line 49:
+Line 75:
-PRMU01    2° 40'
PRMU02    2° 42'
PRMU03    2° 43'
PRMU04    2° 40'  (extra)
+------
-Line 54:
+Line 77:
-SRMU01    -
SRMU02    2° 41'
SRMU03    2° 41'
SRMU04    2° 44'  (extra)
}}}
+== 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]]