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Proceedings Paper

Laser strength of dielectric interference coatings on optical materials, rods, and non-linear crystals
Author(s): Vladimir V. Novopashin; Alexsandr V. Shestakov
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Paper Abstract

The novel view of multilayer coatings is that it consist of homogeneous layers with parallel and perfectly smooth boundaries whose properties are the same as the bulk starting materials. But the new technologies and design in lasers and laser elements defined the demands to optical coatings. First of all it concerns the absorption in coatings, thermo-conduction in film and scattering in visible region. The most of dielectric interference coatings are fabricated, as usual by electron-beam evaporation, but to produce more density films method of ion-beam sputtering is used. Both of these methods have has advantages and deficiencies simultaneously. For example, films produced by ion-beam sputtering possess more perfect structure which composition was closed to the bulk material. But in many cases such coatings had higher absorption and decreasing the laser strength. Especially it can be during the evaporation on non-linear crystals (LiJO3, LiTaO3, LiNbO3, KTP, RTP, BBO, LBO, KDP, DKDP, AGS, HGS). For these crystals method of electron-beam evaporation with ion-beam assistance is used. This concerns especially the crystals that could be coated without heating in vacuum chamber. Another effect of ion-beam influence at a most extent revealed during evaporation oxide materials, which activated the mobility of atoms deposited on substrate. Pre-cleaning by the ion-beam of neutral gas (Ar+) before the evaporation was important to produce mirrors for Y3Al5O12 +Er3+ lasers in 1800 – 3200 nm. Well enough results were obtained for anti-reflection coatings of AGS and HGS crystals in a broad region 1.053 – 11 microns. The improvement of optical properties evaporated films led to obtain almost perfectly coatings and stabilized characteristics of lasers and laser elements.

Paper Details

Date Published:
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Proc. SPIE 8837, Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems, 88370X; doi: 10.1117/12.2024885
Show Author Affiliations
Vladimir V. Novopashin, POLYUS Research and Development Institute (Russian Federation)
Alexsandr V. Shestakov, POLYUS Research and Development Institute (Russian Federation)


Published in SPIE Proceedings Vol. 8837:
Material Technologies and Applications to Optics, Structures, Components, and Sub-Systems
Joseph L. Robichaud; Matthias Krödel; William A. Goodman, Editor(s)

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