Blue light was generated at room temperature by quasiphase matched second harmonic generation in planar and channel lithium tantalate (LiTaO3) annealed proton exchange waveguides using the d33 nonlinear coefficient. Alternating ferro-electric domains for third order quasiphase matching were created by poling the substrates with a periodic electric field.
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Matsumoto et al. (1991) studied this question.
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