Further studies on lif-overcoated aluminum mirrors with highest reflectance in the vacuum ultraviolet
J. T. Cox, G. Hass, J. E. Waylonis
Further studies have been made on the preparation of LiF-overcoated aluminum mirrors with highest reflectance at wavelengths down to 1000 Å. Mirrors with 73% reflectance at ɛ = 1026 Å have been made. The extinction coefficient k of evaporated LiF films has been measured under various conditions of film preparation. Techniques for vacuum depositing LiF films with the smallest k and Al + LiF mirrors with the highest reflectance are described. Aging of LiF-coated Al mirrors under various conditions is discussed. © 1968 Optical Society of America.
Materials
Curve 1
Temperature, K: ~298
Wavelength Range, um: 0.0911-0.1900
Geometry θ θ' ω: ~0°~0°
Composition (weight percent), Specifications, and Remarks: LiF (140 A thick); Al 99.99 pure, and unknown substrate: Al vacuum deposited at ~400 A sec⁻¹; LiF evaporation deposited at 20 Å sec⁻¹ on substrate at~298 K; measured in vacuum 10 min after preparation; data extracted from smooth curve.