CERENKOV-TYPE 2ND-HARMONIC GENERATION WITH A NONLINEAR ORGANIC POLYMER WAVE-GUIDE

We realized experimentally a Cerenkov-type second-harmonic wave genera ted by a Nd:YAG laser (lambda = 1064-nm) in film slab waveguides made of corona-poled Poly (Disperse Red1 Methacrylate-Co-Methyl Methacrylat e). The dependence of the conversion efficiency on the waveguide thick ness was studied, and we found that there was a single generalized cur ve for the conversion efficiency for different input powers and that t he effect of multiple reflections, as well as an increase in the power density in the waveguide, strongly enhanced in the second-harmonic ge neration conversion efficiency. The largest conversion efficiency was found to be about 10(-5) at a him thickness of 0.91 mu m.