High reflectivity large scale telescope mirror coatings via long throw sputtering

A. J. Bourque; J. H. Gurian

doi:10.1117/12.2056909

18 July 2014 High reflectivity large scale telescope mirror coatings via long throw sputtering

A. J. Bourque, J. H. Gurian

Proceedings Volume 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation; 91515J (2014) https://doi.org/10.1117/12.2056909
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Here we present reflectivity measurements of long throw sputtered aluminum coatings at normal and oblique incidence angles on glass test chips. Experimental results indicate that water vapor partial pressure, not incident angle, is the dominant factor for front surface reflectivity of sputtered aluminum. These results highlight the importance of water vapor pumping in telescope mirror coating vacuum chambers and indicate that long-throw sputtering is an economical and reliable technique for producing high uniformity, high reflectivity mirror coatings across large substrates.

Citation Download Citation

A. J. Bourque and J. H. Gurian "High reflectivity large scale telescope mirror coatings via long throw sputtering", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91515J (18 July 2014); https://doi.org/10.1117/12.2056909

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