The thermo-optic properties of CdSe/ZnS quantum dots (QDs) are investigated in this paper. Two CdSe/ZnS QDs-doped samples are fabricated and the closed aperture Z-scan data were obtained by a single-beam Z-scan setup with a continuous laser as the exciting source. With the measured curves the coefficient of nonlinear refractive index n2 (caused by thermal effect) and the thermo-optic coefficient were achieved. CdSe/ZnS QDs-doped materials show larger thermooptic coefficients than the glass materials by 2 orders of magnitude.
Based on laser kinetics and diffraction theories of resonators, the gas mixtures (CO2, N2, He, Xe and H2) and the resonator parameters of a typical sealed-off CO2 laser are optimized by applying a genetic algorithm for obtaining a maximal laser output power. With the optimized parameters, the simulated and measured laser power is 2.27 and 1.6 times greater than the usually non-optimized CO2 laser, respectively.
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