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We describe the concept of fractional quasi-phasematching which is shown to provide efficient nonlinear conversion, close to perfectly phasematched scenarios. The conceptual design in the case of second-harmonic generation is presented, along with predicted performances.
We present a new quasiphase matching scenario based on the Fresnel birefringence occurring at total internal reflection, Thanks to non resonant conditions on the semiconductor plate thickness, ultrawide tunability is made possible (8-13 /spl mu/m).
Tunable midinfrared sources (8-12 /spl mu/m) based on GaAs and ZnSe slabs are presented. Quasi-phase matched difference frequency generation is obtained by total internal reflection. In nanosecond operation, we get up to 0.5 nanojoule of midinfrared light.
Summary form only given. Large nonlinear coefficient, possibility of integration with semiconductor lasers, and excellent control of structures make GaAs waveguides very well suited to nonlinear frequency conversion in the near-infrared. Realization of GaAs waveguide converters has been prevented until now by the problem of phase matching. Phase matching can be achieved by use of artificial birefringence...
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