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Reflection SHG measurements with fundamental wavelength 532 nm have been carried out on proton-exchanged LiTaO3, waveguides. The SH signal decreased exponentially with waveguide thickness. The result is interpreted as a strongly reduced nonlinearity in the proton-exchanged layer. An increased signal was observed from annealed samples.
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Åhlfeldt et al. (1993) studied this question.
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