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Proceedings Paper

Fabrication and optical properties of sol-gel-derived interference coating for high power laser applications
Author(s): Qinyuan Zhang; Kantisara Pita; Chang-Qing Xu; Wenxiu Que; S. Hinooda; Periyasamy Thilakan
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Paper 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.

Paper Details

Date Published: 29 October 2001
PDF: 5 pages
Proc. SPIE 4594, Design, Fabrication, and Characterization of Photonic Devices II, (29 October 2001); doi: 10.1117/12.446543
Show Author Affiliations
Qinyuan Zhang, Nanyang Technological Univ. (Singapore)
Kantisara Pita, Nanyang Technological Univ. (Singapore)
Chang-Qing Xu, Nanyang Technological Univ. (Singapore)
Wenxiu Que, Nanyang Technological Univ. (Singapore)
S. Hinooda, Nanyang Technological Univ. (Singapore)
Periyasamy Thilakan, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 4594:
Design, Fabrication, and Characterization of Photonic Devices II
Marek Osinski; Soo-Jin Chua; Akira Ishibashi, Editor(s)

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