The method for achieving non-collinear phase matching in stimulated polariton scattering (SPS) using cross-pumping is proposed. Under sub-nanosecond pulse laser pumping conditions, tunable narrowband Stokes light output is obtained. The cross-pumping configuration is established by total internal reflection of the pump light on the side of the crystal. By rotating the crystal, altering the total internal reflection angle of the pump light, thereby changing the phase matching condition and tuning the frequency of the output Stokes light. The output Stokes light is with a linewidth of 0.2 nm. The wavelength tuning range is 1068 nm to 1075 nm. At a pump energy of 8 mJ, the output energy is 1.1 mJ, corresponding to a conversion efficiency of 13.8%. This study provides a reference for phase matching methods in nonlinear parametric conversion processes.
This paper presents a study on continuous wave tunable CO2 lasers, which could be used in good pumping source of optically pumped gas THz laser. A series of comparative experiments to investigate the effects of cavity structure and discharge current on laser tunability and output power was conducted. The wavelength selection of CO2 lasers primarily achieved by altering the angle of incidence of the blazing grating. Two enclosed CO2 laser tubes were designed and customized, one was used for external cavity structure and the other was used for semi-external cavity structure research. Using the semi-external cavity structure, 78 lines was obtained at the range of 9-11μm, and achieved 60.7 W of laser output power at a wavelength of 10.59 μm. A beam quality factor of M2 = 1.68 was measured using the traveling 90/10 knife-edge method.
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