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We report on experiments carried out with improved pumping schemes and present modeling for further enhancement of direct 8-12 mum generation by self-DFM in Cr:ZnSe laser slabs using a Tm:YLF 1.9-mum pulsed pump source.
We show that a guided-wave approach to Fresnel phase-matching is relevant even for thick semiconductor wafers. This approach is implemented to design a bulk GaAs optical parametric oscillator and a terahertz generator by difference-frequency generation.
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.
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