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Frequency doubling in Ti:MgO:LiNbO3 channel waveguides

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Abstract

Second-harmonic generation (SHG) in channel waveguides fabricated by titanium diffusion into MgO-doped lithium niobate is studied. A conversion efficiency for SHG of 2.4%/W has been obtained for a 16-mm-long waveguide by using a Nd:YAG laser as pump source. The conversion efficiency is lower than the theoretical prediction. This difference is attributed to inhomogeneities along the waveguide. The channel waveguides used carried several modes at the second-harmonic wavelength; those modes, phase matched above room temperature (~80°C), showed substantially lower sensitivity for photorefractive damage than others phase matched at room temperature.

© 1988 Optical Society of America

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