Second-harmonic generation and scattering has been studied in ferroelectric triglycine sulfate with a ruby laser. Theoretical considerations show that when the laser beam is incident in the optic plane, five scattered lines must exist with intensity depending upon the domain structure. Experimental data for angular positions of scattered lines are in good agreement with calculated values. The effect of laser polarization is also reported. Studies were made for multi-domain and nearly single-domain crystals obtained by applying a dc electric field. An increase in the scattered intensity is observed when the domain pattern satisfies a Bragg condition.
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Dolino et al. (1970) studied this question.
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