Main optics

We use SOS size (d75mm x t25mm) mirrors for the main optics.

Specifications & Data Sheets

Specifications for 40m upgrade [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/LatestPDFs 40mSVN]

COC documents/drawing files [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/ 40mSVN]

Data sheets from ATF [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/Data_Sheet_sent_by_ATF/ 40mSVN]

Substrate Material

The material of the substrate is Corning 7980 Fused Silica, grade UV-0A.

[http://www.corning.com/docs/specialtymaterials/pisheets/H0607_hpfs_Standard_ProductSheet.pdf Link to the data sheet of Corning 7980]

Radius of Curvatures

Considerations on the parameters of PRC/SRC

Discrepancies between the spec and the delivered optics

We are going to use one of the SRMs as a temporaly PRM.
PRMs and SRMs will have the wedge angle larger than the spec (see below).

PRMs were returned for repolish. Thus, their wedge angles might be vary. This is to be confirmed.

ITMs have the wedge angle of ~1deg, instead of the spec "2 deg"

Communication between ATF and Coastline

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

Ramin,

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'.

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:

PRMU01    2° 40'
PRMU02    2° 42'
PRMU03    2° 43'
PRMU04    2° 40'  (extra)

SRMU01    -
SRMU02    2° 41'
SRMU03    2° 41'
SRMU04    2° 44'  (extra)

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 (Temporaly)

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	39.9 deg	17.1 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

-  ⇤ ← Revision 37 as of 2009-11-23 22:16:36 → 
  Size: 2992
  Editor: KojiArai
  Comment:
+   ← Revision 38 as of 2009-12-02 12:27:51 → ⇥
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  Editor: KojiArai
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-## page was renamed from Upgrade 08/Optics
+<<TableOfContents(2)>>
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+------

= Main optics =
We use SOS size (d75mm x t25mm) mirrors for the main optics.

== Specifications & Data Sheets ==
Specifications for 40m upgrade [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/LatestPDFs 40mSVN]

COC documents/drawing files [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/ 40mSVN]

Data sheets from ATF [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/Data_Sheet_sent_by_ATF/ 40mSVN]

------
-Line 4:
+Line 17:
-Line 7:
+Line 19:
-[http://www.corning.com/docs/specialtymaterials/pisheets/H0607_hpfs_Standard_ProductSheet.pdf Here]
is the link to the data sheet of Corning 7980.
+[http://www.corning.com/docs/specialtymaterials/pisheets/H0607_hpfs_Standard_ProductSheet.pdf Link to the data sheet of Corning 7980]
-Line 10:
+Line 21:
-== Coatings and Optics ==
This is a work in progress area for what optic and coatings we need.
+== Radius of Curvatures ==
[[Upgrade 08/Optics/RCParams|Considerations on the parameters of PRC/SRC]]
-Line 13:
+Line 24:
-|| 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 ||
+== Discrepancies between the spec and the delivered optics ==
 * We are going to use one of the SRMs as a temporaly PRM.
 * PRMs and SRMs will have the wedge angle larger than the spec (see below).
-Line 21:
+Line 28:
+PRMs were returned for repolish. Thus, their wedge angles might be vary. This is to be confirmed.
-Line 22:
+Line 30:
-[[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 || 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 || 39.9 deg || 17.1 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 ||


 . [[Upgrade 08/Optics/RCParams|Considerations on the parameters of PRC/SRC]]         

----
+ * ITMs have the wedge angle of ~1deg, instead of the spec "2 deg"
-Line 69:
+Line 57:
-----
+------
= Folding mirrors =
We use 2inch mirrors (d2" x t3/8") mirrors for the PRC/SRC folding mirrors.
-Line 71:
+Line 61:
-Data sheets from ATF on 40m svn
[https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/cocdocs/Data_Sheet_sent_by_ATF/]
+Their name has been changed such that the definition agrees with the AdvLIGO naming. (12/01/2009)

== Specs of the folding mirrors (Temporaly) ==
|| 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 || 39.9 deg || 17.1 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 ||