Specification : 40m dichroic RC folding mirrors

Document #:

LIGO-E1700016-v9

Document type:

E - Engineering documents

Abstract:

Specification for 2” diameter optic to replace existing (convex) PR3/SR3 at the CIT 40m

Files in Document:

• PR3/SR3 spec (E1700016_v9.pdf, 881.2 kB)

Other Files:

• AR side spectral reflectivity around 532nm (PR3_AR_SpectralRefl_zoomed.pdf, 36.2 kB)
• Expected distributions of R and T on AR side (PR3_AR_MC.pdf, 50.6 kB)
• Expected distributions of R and T on HR side (PR3_HR_MC.pdf, 50.6 kB)
• HR side MC results zoomed (PR3_HR_MC_zoomed.pdf, 50.6 kB)
• HR side spectral reflectivity around 532nm (PR3_HR_SpectralRefl_zoomed.pdf, 37.6 kB)
• Optimized layer structure for HR and AR coatings (PR3_Layers_v9.xlsx, 46.3 kB)
• PR3/SR3 spec (E1700016_v9.docx, 246.3 kB)
• Spectral reflectivity on AR side (PR3_AR_SpectralRefl.pdf, 94.3 kB)
• Spectral reflectivity on HR side (PR3_HR_SpectralRefl.pdf, 96.2 kB)

Topics:

• Upgrades
• Basic R&D

Authors:

• Gautam Venugopalan
• Eric Gustafson
• Rana Adhikari
• Koji Arai

Keywords:

40m PR3 SR3 RC folding mirror dichroic

Notes and Changes:

v4 - updated MC numbers, adding spreadsheet with histograms from MC analysis. Also added some details about the coating optimization and the assumed dispersion relation.
v5 - updated calculations with dispersion from Ramin, changed constraints on layer thickness in particle swarm optimization
v6 - updated calculation based on new dispersion from Ramin.
v7 - fixed bug in code related to taking into account dispersion properly
v8 - slightly reduced sensitivity to assumed parameters for both coatings
v9 - specified Substrate to be Corning 7980 HPFS UV-0F grade, fixed axes labels in MC study plots.

Referenced by:

• LIGO-E1800089-v7: Specification : 40m dichroic RC folding mirrors