Stimulated polariton scattering (SPS) is one of the most important non-collinear phase-matching nonlinear process. In SPS, the angle between the THz and pump waves is as large as 65°, so it is necessary to study the spatial intensity distributions of the pump, Stokes and THz waves effected by the non-collinear phase-matching. In this work, we take the injection-seeded terahertz wave parametric generator (is-TPG) as an example to obtain the numerical solutions of the coupled-wave equations. The simulation results are focused on the spatial-temporal intensity distributions and the energy input-output characteristics. It is notable that the spatial intensity distributions of the pump and Stokes beams along the THz-wave propagation direction are not uniform as the inputs. The pump wave is depleted along the THz-wave propagation direction while the Stokes wave is increasing at the same time.
This paper presents the tunable Stokes laser characteristics based on the stimulated polariton scattering in KTiOAsO4 crystal. With a given pumping laser wavelength of 1064.2 nm, discontinuously tunable first-Stokes wave was obtained from 1077.9 to 1079.0 nm, from 1080.1 to 1080.8 nm, from 1082.8 to 1083.6 nm, from 1085.5 to 1085.8 nm, from 1086.8 to 1088.4 nm. With a pumping pulse energy of 125.0 mJ, the maximum first-Stokes laser pulse energy at 1078.6 nm was 24.7 mJ. The second-Stokes wave at 1093.4 nm was obtained and investigated as well.
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