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A mechanism for frequency generation which can occur in waveguide distributed-feedback lasers on anisotropic substrates is discussed. The proposed mechanism is a hybrid Bragg scattering between oppositely travelling waves with orthogonal polarizations. It explains the frequency spectrum observed in the preceding letter, which occurs as a result of the simultaneous presence of two coupled-wave phenomena: mode conversion due to the anisotropic substrate, and backward Bragg scattering due to the periodic waveguide structure.
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Kogelnik et al. (1973) studied this question.
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