Abstract
DR1 (4-[N-ethyl-N-(2-hydroxyethyl)]amino-4′-nitro-azobenzene) doped silica films were prepared by a solgel method, from a solution of tetraethyl orthosilicate and DR1. The films were optically poled and heat-treated to build a polarized structure for second-order optical nonlinearity. Two seed beams at 1064 and 532nm wavelengths from a Q-switched Nd: YAG laser were coaxially applied to the films. Second-harmonic generation was observed from the films after the optical-poling. We found that the rigid silica matrix prevented the relaxation of polarized structure.
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