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Table 2

Material constants of coatings.

Coating Mirror n k ϵ r  ∥  r perp δ
 [deg]   [deg] 

Alu. M3 2.75 20.0 45° 0.96262 0.98113 176.03
Silflex NAOSI & II 45.00 0.98272 0.98872 165.00
Gold S13I 0.99 13.8 42.05 0.97266 0.98484 175.02
S13II 2.95 0.97959 0.97964 179.98
S27I 27.65 0.97701 0.98193 177.99
S27II 17.35 0.97865 0.98054 179.23

Notes. Refractive index n, extinction coefficient k, reflection coefficients, and relative retardation for the coatings of NACO at 2.2   μ. ϵ is the angle of incidence for which the reflection coefficients and relative retardation was computed. The material constants can be found on www.RefractiveIndex.info. The default k value for aluminum is 22.3, and δ for Silflex is 166.6 according to Balzers Optics specifications. Both values have been changed to match the position dependency of measured Stokes parameters (see Sect. 3.2).

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