Switching and second harmonic generation using counterpropagating quasi-phase-matching in a mirrorless configuration

Numerical solutions to the set of coupled nonlinear wave equations for a no vel mirrorless counterpropagating quasi-phase-matched (c-QPM) device are pr esented, Mirrorless c-QPM is investigated in stand-alone and in two interfe rometric configurations for ah-optical switching (AOS) applications. The sw itching intensity is found to be very low using existing materials (e.g., 5 00 mW in a 1-cm-long KTP waveguide with a 10 mu m(2) effective area). Addit ionally, parameter sets are found that minimize pulse breakup and improve t he possibility of a practical implementation.. Although second harmonic gen eration (SHG) is also investigated in the stand-alone device, the conversio n efficiency is shown to be eight times less efficient than the mirrored co nfiguration.