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Second-harmonic generation in a LiTaO3 periodically poled by electric field is presented. The side growth of the domain-inverted region during the poling was found to be suppressed using selective proton exchange. Utilizing this technique, a first-order periodic domain inversion having uniform periodicity was realized over interaction length of 10 mm in a 300-μm thick LiTaO3 substrate. A 3.8 mW of harmonic blue light was generated for a conversion efficiency of 1.27% in a single pass through the periodically domain-inverted structure.
Mizuuchi et al. (1995) studied this question.