CERENKOV 2ND-HARMONIC GENERATION IN THE STRONG CONVERSION LIMIT - NEWEFFECTS

Using beam propagation method calculations, we show that new effects o ccur for second-harmonic generation in the Cerenkov regime when it is optimized for efficient coupling to leaky modes. The fundamental throu ghput becomes independent of the input power over a few decades; i.e., optical power limiting is found. At even higher input powers, the fun damental throughput abruptly switches back to approximately the input power as a consequence of generating coupled second-harmonic-fundament al solitary waves in the waveguide because of the cascading effect. (C ) 1996 Optical Society of America