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13 September 2012 Enhanced MgF2 and LiF over-coated Al mirrors for FUV space astronomy
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Astronomical observations in the far--ultraviolet (FUV) spectral region are some of the more challenging due to the very distant and faint objects that are typically searched for in cosmic origin studies such as origin of large scale structure, the formation, evolution, and age of galaxies and the origin of stellar and planetary systems. The problem is compounded by the very limited option of reflecting coatings to use at FUV wavelengths and the modest reflectivity offered by those coatings such as Al+MgF2 [typically 82 % at Lyman-alpha, 1216 Α) that are used on reflecting surfaces of FUV instrumentation. Improved reflective coatings for optics, particularly in the ultraviolet part of the spectrum, could yield dramatically more sensitive instruments and permit more instrument design freedom. This paper will present recent advances in reflectance performance for Al+MgF2 mirrors optimized for Lymanalpha wavelength by comparing an ambient or ”cold” deposition with another where the deposition temperature for the MgF2 layer is done at elevated temperatures. We will also consider this improved procedure for the deposition of LiF over-coated Al mirrors in order to realize similar reflectivity gains at even shorter wavelengths.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Manuel A. Quijada, Stephen Rice, and Eric Mentzell "Enhanced MgF2 and LiF over-coated Al mirrors for FUV space astronomy", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84502H (13 September 2012);

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