Numerical solutions to the nonlinear coupled-wave equations of a counterpropagating quasi-phase-matched device are analyzed by numerical methods for both second-harmonic generation and cascaded processes. Normalized derivations for second-harmonic generation efficiency are also presented. The nonlinear phase shifts acquired in this device by cascaded second-order processes are promising in all-optical-switching applications. Specifically, a π/2 phase shift is shown to be achievable with 42 times less input intensity than the standard Type I configuration and 100% throughput. The effects of metallic mirrors are also presented. Careful use of the phase mismatch is shown to compensate for nonideal mirrors. Finally, conservation of power in this configuration is briefly investigated.

© 1998 Optical Society of America

[Optical Society of America ]

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