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Reflective-type configuration for nearly phase-matching Čerenkov second-harmonic generation in a nonlinear-optical polymer waveguide

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Abstract

A new technique for achieving efficient Čerenkov-type second-harmonic generation (SHG) in a nonlinear-optical (NLO) polymer waveguide is presented. The configuration, which can prevent the losses of light caused by relatively long-distance propagation and the multiple reflections that appear in the conventional Čerenkov technique, exhibits ease of fabrication and compactness. We experimentally observed a conversion efficiency of 1.6% W-1 cm-1, which to our knowledge is the highest value reported for Čerenkov SHG in polymer, by tuning both the thickness and the refractive index of the polymer film close to phase matching between a guided fundamental wave and a guided harmonic wave. The experimental results agreed well with the theoretical prediction.

© 2005 Optical Society of America

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