Generation of summary and difference frequency radiation in the field of few-cycle laser pulse propagating in periodically-poled lithium niobate

Abstract

The results of numerical study of the generation process of summary and difference frequency radiations (SFR and DFR) arising via interaction of linearly polarized a few-cycle laser pulses propagating in a quasi-phase-matching (QPM) LiNbO3 crystal is present. Considered the interaction of pulses having the central wavelengths of 0.81 μm, duration of 10 fs with the electric field amplitude 600 MV/m, propagating along the normal to the optical axis. The period of QPM LiNbO3 crystal in numerical simulations is 12.6 μm and chosen such that QPM generation of DFR takes place at 3 μm. It is shown that at this period take place the simultaneous QPM for SFR at 0.41 μm, 0.36 μm, 0.33 μm, and 0.31 μm and for DFR at 3 μm wavelengths respectively.