Fabrication and optical properties of sol-gel-derived interference coating for high power laser applications

Qinyuan Zhang; Kantisara Pita; Chang-Qing Xu; Wenxiu Que; S. Hinooda; Periyasamy Thilakan

doi:10.1117/12.446543

29 October 2001 Fabrication and optical properties of sol-gel-derived interference coating for high power laser applications

Qinyuan Zhang, Kantisara Pita, Chang-Qing Xu, Wenxiu Que, S. Hinooda, Periyasamy Thilakan

Author Affiliations +

Proceedings Volume 4594, Design, Fabrication, and Characterization of Photonic Devices II; (2001) https://doi.org/10.1117/12.446543
Event: International Symposium on Photonics and Applications, 2001, Singapore, Singapore

Abstract

A single layer sol-gel derived TiO₂ thin films and 6 periods SiO₂/TiO₂ multilayer coating were designed and prepared on GaAs substrates as anti-reflection coating or near-IR-reflective coating for high power semiconductor laser applications. Crack free TiO₂ thin films having thickness of 80-150 nm, and refractive indices of 1.8-2.1 have been obtained by simply sol-gel method upon heating at different temperatures. The obtained TiO₂ thin films on GaAs substrates have shown reflectance of <EQ 1 percent in the wavelength of about 808 nm. Thin films of TiO₂ and SiO₂ were also used to fabricate near IR reflector ion GaAs substrates. The reflector consisted of 6 SiO₂/TiO₂ bi-layers, designed with a high-reflective band in the wavelength of 1064 nm. A minimum transmittance of <EQ 2 percent in the wavelength range between 950 and 1100 nm has been obtained in the present multilayer SiO₂/TiO₂ coating.

Citation Download Citation

Qinyuan Zhang, Kantisara Pita, Chang-Qing Xu, Wenxiu Que, S. Hinooda, and Periyasamy Thilakan "Fabrication and optical properties of sol-gel-derived interference coating for high power laser applications", Proc. SPIE 4594, Design, Fabrication, and Characterization of Photonic Devices II, (29 October 2001); https://doi.org/10.1117/12.446543

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