MODAL PROPERTIES OF 2ND-HARMONIC GENERATION IN DOPED-SILICA PLANAR WAVE-GUIDES

Planar waveguides of germania-doped silica have been optically modifie d to allow second-harmonic generation in various waveguiding modes. Af ter optical modification, the propagation of only the fundamental wave produced film-generated second-harmonic light in the same waveguide m ode with which it had been prepared. The relative efficiencies of seve ral mode combinations were all measured to be within an order of magni tude of one another and in reasonable agreement with theoretical predi ctions. Furthermore, we discuss the discrepancy between the theoretica l calculations and experimental observations of the modal properties o f second-harmonic generation in fibers.