About the problem of decreasing optical losses in fluoride films

Evgeny N. Kotlikov; Elena V. Khonineva; Vadim N. Prokashev

doi:10.1117/12.580018

15 July 2004 About the problem of decreasing optical losses in fluoride films

Evgeny N. Kotlikov, Elena V. Khonineva, Vadim N. Prokashev

Proceedings Volume 5506, Nonresonant Laser-Matter Interaction (NLMI-11); (2004) https://doi.org/10.1117/12.580018
Event: Nonresonant Laser-Matter Interaction (NLMI-11), 2003, St. Petersburg, Russian Federation

Abstract

Films of fluorides may crystallize during vacuum deposition on substrates that leads to undesirable diminishing of transparency of films (having optical thickness more than 3 ÷ 5 μm) for the visible spectral range. To solve this problem we carried out investigation of optical properties of alloyed BaF₂, CaF₂, and PbF₂ films and we demonstrated the possibility of deposition of films being transparent in visible and infrared ranges. We defined optimal values of concentration of alloying impurities and functional dependencies of impurity's concentration and optical losses. Based on alloyed BaF₂ films there were synthesized, made and researched interference coatings for lasers in visible and middle IR spectral ranges. The synthesis was realized due to special elaborated techniques allowing to get over the restriction of the number of film-forming materials with different refractive indexes and to produce coatings with required spectral characteristics. There were shown examples of the set of multilayer film coatings functioning successfully for laser radiation on wavelengths 0.63 and 10.6 μm simultaneously.

Citation Download Citation

Evgeny N. Kotlikov, Elena V. Khonineva, and Vadim N. Prokashev "About the problem of decreasing optical losses in fluoride films", Proc. SPIE 5506, Nonresonant Laser-Matter Interaction (NLMI-11), (15 July 2004); https://doi.org/10.1117/12.580018

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KEYWORDS

Refractive index

Visible radiation

Optical coatings

Reflection

Magnesium fluoride

Infrared radiation

Light scattering

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