The optical constants of the films MgBaF₄ in the range of 1.3–16 micron

Abstract

A BaF2 films, characterized by low refraction coefficient in the infrared region of the spectrum, are widely used in the production technology of optical structures. Their serious drawback is the low mechanical strength and moisture resistance. This paper presents the results of an experimental study of the optical properties of a new type of MgBaF4 films made from a vacuum-sintered mixture of MgF2 and BaF2 to a homogeneous composition.

Research and application of BaYF5 optical films in the range of 1.3-27 microns

“…Double fluoride films more resistant to moisture and have best hardness compared to films of pure fluorides. That is why double fluoride films are more preferable [1,[4][5][6]. Their usage supposes availability of data of the optical coefficients of films in the separated spectrum range and on different substrates.…”

“…The results of the study of optical constants of CaY2F8, MgBaF4 and BaYF5 films in the spectrum range of 1.3-16 microns are presented in [4][5][6]. In these works, a spectrophotometric method was used to determine the optical coefficients of films based on the revision of the reflection and transmission spectra taking into account absorption, which was described in [7,8].…”

“…Having previously calculated values AR and AT according formulas (6) and adding them in reflection and transmission for each wavelength, we have possibility to correct the absorption spectra:…”