CHARGE DYNAMICS AND POLING IN GLASS WAVE-GUIDES

Germanosilicate glass waveguides were electrically poled using interdi gitated electrodes. This poling resulted in a quasiphase-matched secon d-order susceptibility. Second-harmonic light was observed. Measured i ntensities were one to two orders of magnitude smaller than expected b ased on previous electric-field-induced second-harmonic (EFISH) genera tion studies with the same interdigitated electrodes, The dynamics of the EFISH signals were studied. Exponentially decaying signals suggest that through charge migration, via dielectric relaxation and electron ic drift, a compromising field is established during the poling. This results in a weaker second-order susceptibility. (C) 1996 American Ins titute of Physics.