Second Harmonic Generation in Nb2O5 Thin-Film Optical Waveguide Deposited on LiTaO3 Substrate by RF Magnetron Sputtering
- 1 September 1992
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 31 (9S)
- https://doi.org/10.1143/jjap.31.3164
Abstract
The first experimental observation of Cerenkov-type second harmonic generation (SHG) in an amorphous Nb2O5 thin-film optical waveguide on (0001) LiTaO3 substrate is reported. The Nb2O5 thin films were deposited by rf magnetron sputtering on LiTaO3 substrate. A Nd:YAG laser at 1064 nm wavelength was used as the pumping source for the SHG experiments. The conversions occurred between the fundamental (1064 nm) TE0 guided mode and the harmonic (532 nm) TM radiation mode, and between the TM0 guided mode and the TM radiation mode. The efficiency of both conversions was about 10-8 for a sample with a film thickness of 788 nm. These SHG results were in good agreement with the coupled-mode theory, and the theoretical calculation revealed that the low conversion efficiencies were due to the unsuitable film thickness. It was predicted that the efficiencies could be raised to a much higher level.Keywords
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