Laser-strength mirrors for high-power NIR-region solid state lasers

Vladimir V. Novopashin; Elena A. Levchuk; Alexander V. Shestakov

doi:10.1117/12.321954

17 September 1998 Laser-strength mirrors for high-power NIR-region solid state lasers

Vladimir V. Novopashin, Elena A. Levchuk, Alexander V. Shestakov

Proceedings Volume 3413, Materials Modification by Ion Irradiation; (1998) https://doi.org/10.1117/12.321954
Event: Lasers and Materials in Industry and Opto-Contact Workshop, 1998, Quebec, Canada

Abstract

Some aspects of obtaining high reflective (HR) dielectric mirrors with high damage threshold (LDT) for high-power solid-state near IR region (NIR) lasers are considered. Optical properties of these mirrors were investigated as properties of each alternate layer evaporated with high- index (H) or low-index (L) materials as multilayer system that depends on mirror construction, parameters of evaporation, ion-beam influence, substrate materials and quality of substrate surface. Refractory oxides ZrO₂,HfO₂, Ta₂O₅, Al₂O₃ and SiO₂ were used as starting materials for evaporation. Ion-beam influence was estimated as changing of optical absorbance at a wavelength 1.064 micrometers by laser modulated photo-thermal radiometry. Besides the quality of various work-up substrate surface was controlled by this method also. It was noticed that substrates with different surface roughness had different absorption. It was noticed that band edge of absorption of pure substrate in UV region influenced on laser damage threshold of mirrors. Optical properties of evaporated mirrors were tested as the ability of strength for laser irradiation as cavity-mirrors of high power lasers. ZrO₂/SiO₂ mirrors had the most high laser strength. Estimated value of laser density was 3.6 GW/cm².

Citation Download Citation

Vladimir V. Novopashin, Elena A. Levchuk, and Alexander V. Shestakov "Laser-strength mirrors for high-power NIR-region solid state lasers", Proc. SPIE 3413, Materials Modification by Ion Irradiation, (17 September 1998); https://doi.org/10.1117/12.321954

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