Specification : 40m dichroic RC folding mirrors

Document #:

LIGO-E1800089-v6

Document type:

E - Engineering documents

Abstract:

Specification for 2” diameter optic to replace existing (convex) PR3/SR3 at the CIT 40m. This set of specifications have been arrived at essentially using the same considerations as E1700016-v9, but we have now relaxed the requirements on green reflectivity.

Files in Document:

• E1800089_v6.pdf (253.5 kB)

Other Files:

• Coating Layer Thicknesses (PR3_Layers_v2.xlsx, 47.7 kB)
• MC analysis for optimized structure (PR3_cornerPlt_optim.pdf, 577.5 kB)
• MC analysis for simplified structure (PR3_cornerPlt_QW.pdf, 580.3 kB)
• PR3/SR3 spec word version (E1800089_v3.docx, 204.3 kB)
• PRC TMS forecast (TMS_PRC.pdf, 37.4 kB)
• PRC mode-matching forecast (PRC_modematch.pdf, 63.3 kB)
• SRC TMS forecast (TMS_SRC.pdf, 37.5 kB)
• SRC mode-matching forecast (SRC_modematch.pdf, 65.8 kB)
• Spectral reflectivity for the HR coating (40m_PR3_specREFL.pdf, 172.0 kB)

Topics:

• Core Optics
• Upgrades

Authors:

• Gautam Venugopalan
• Rana Adhikari
• Koji Arai

Keywords:

40m optics coating

Notes and Changes:

v3: minor changes from v2 to make the wording less ambiguous. Also added explicitly formula used to compute sagitta.
v4: added files for coating design (i.e. layer thicknesses), spectral reflectivity plot, and MC analysis.
v5: adding coating design with just 3 layer thicknesses repeated, seems to give okay performance.
v6: Making specifications less ambiguous.

Related Documents:

• LIGO-E1700016: Specification : 40m dichroic RC folding mirrors