On the generation of optical third-harmonic through quasi-phase-matching in quadratic nonlinear crystals
У. К. СапаевTashkent State Technical University, Faculty of Electronics and Automation, Universitetskaya Street 2, Almazar d/t, 100095, Tashkent, UzbekistanGaetano AssantoNooEL—Nonlinear Optics and OptoElectronics Lab, Department of IIEM - University “Roma Tre”, 00146, Rome, Italy
ABI
Annotatsiya
We investigate the simultaneous processes of optical sum frequency generation and frequency doubling in quasi-phase-matched quadratically nonlinear crystals. Specifically, we focus on lattices with domain thicknesses corresponding to the coherence lengths of the two cascaded parametric processes and explore the realistic scenario of a single crystal containing sequential domain segments, each independently satisfying quasi-phase-matching for optical doubling and tripling, respectively. We demonstrate that high conversion efficiencies to the third harmonic can be obtained from an arbitrary fundamental wavelength.
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