The spectral reflectivity of back-surface and front-surface aluminized mirrors
G. G. Twidle
Results are given of a determination of spectral reflectivity of back- and front-aluminized quartz mirrors in the wavelength-range 0.25-1.35μ. A résumé is given, including reference to other recent work on front-surface mirrors, showing what are thought to be the highest values of reflectivity obtainable over the range 0.1-12μ. The technical precautions necessary for the attainment of these optimum values are discussed in practical terms.
Materials
Curve 1
Temperature, K: ~298
Wavelength Range, μm: 0.257-1.3570
Geometry θ' β': ~20°- ~20°
Reported Error, %: <2
Curve 1
Temperature, K: 298
Wavelength Range, um: 0.2482-1.3570
Geometry θ θ': ~20°~20°
Reported Error, %: <2
Composition (weight percent), Specifications, and Remarks: Fused quartz; Al, 99.99 pure, substrate; Al vapor deposited; data is mean of five specimens.