Abstract
Organic polymers not only have large, nonlinear-optical susceptibility but also various advantages, such as flexibility, a high optical damage threshold, and ease of film growth. We have observed second-harmonic generation (SHG) by using a vinylidene cyanide/vinyl acetate (VDCN/VAc) copolymer at Nd:YAG 1.06-μm and Er:YAG 2.94-μm laser lines.1,2 It is impossible to phase match organic polymers by adjusting the setting angle as one does a crystal; thus, the SHG power has been improved to satisfy the phase-matching condition with slab-waveguide and Cerenkov-radiation schemes.3,4 However, film thickness and optical smoothness of the interface between the film and cladding must still be controlled. Optical nonlinear susceptibility generally induced by applying the poling field in organic polymer or copolymer; applying the poling field with a periodically inverted configuration produces periodic corrugation in the optical nonlinearity to satisfy the phase-matched condition. In this paper we report the enhancement of SHG power with a periodically poling corrugated VDCN/VAc copolymer at 2.94-μm Er:YAG laser radiation.
© 1991 Optical Society of America
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