Abstract

By irradiation of a UV source through a metallic mask with a chirped periodic or periodic structure and a metallic wire onto vinylidene cyanide/vinyl acetate copolymer, the Čerenkov-radiative second-harmonic generation has been efficiently enhanced, with the channel waveguide having a chirped periodic nonlinear optical susceptibility ${\chi }^{(2)}$ corrugation. By use of an ArF 193-nm laser close to an inherent absorption line of the copolymer as the UV source, not only a nonlinear optical ${\chi }^{(2)}$ corrugation with the average period ${\mathrm{\Lambda }}_{s0}$ $=\hspace{0.5em}20 \mu \mathrm{m}$ and a chirping index ${\varphi }_m\simeq 9$ but also a channel guide 60 μm wide were induced. The enhancement factor of the Čerenkovian second-harmonic-generation power achieved was 7.4 times that of a uniform nonlinear optical ${\chi }^{(2)}$ scheme. This simple UV irradiation method leads to almost the same effect as is obtained by a contact electrode method, showing its feasibility for the Čerenkovian second-harmonic-generation scheme.

© 1998 Optical Society of America

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