Abstract

In second-harmonic generation (SHG) perfect phase-matching cannot be essentially satisfied between fundamental and second-harmonic (SH) waves for organic polymers or copolymers as done in inorganic crystals. Thus, it is quite required to take the phase-matching by some means. In order to overcome this disadvantage the inter-mode and the Cerenkov radiative phase-matchings have been often adopted in a slab or channel waveguide with mainly nonlinear optical (NLO) organic and inorganic crystals. However, since the attainable SHG power is necessarily limited, a periodic corrugation of the NLO susceptibility χ⁽²⁾ is induced into the waveguide for the phase-matching or quasi-phase matching by using the technique of domain-inversion in inorganic crystals.

© 1993 Optical Society of America