The thermal effect and the heat generation in diode-end-pumped continuous-wave 914-nm Nd：YVO4 lasers are investigated in detail. A theoretical model of a diode end-pumped solid-state laser is constructed to analyse t...The thermal effect and the heat generation in diode-end-pumped continuous-wave 914-nm Nd：YVO4 lasers are investigated in detail. A theoretical model of a diode end-pumped solid-state laser is constructed to analyse the influence of fractional thermal loading on the thermal effect in the Nd：YVO4 laser based on finite element analysis. The thermal focal lengths and the end-surface deformations of laser rods in Nd：YVO4 quasi-three-level and four-level lasers are measured and compared with the results obtained by ordinary interferometry for the demonstration of higher thermal loading in 914-nm laser. Finally the fractional thermal loading in the Nd：YVO4 quasi-three-level laser is calculated by matching the experimental and the simulated end deformations.展开更多
Differential cross sections for the elastic scattering of electrons by H2 at 100 eV and 150 eV have been calculated and compared with experiments.We use the momentum space method in which the electron-molecule system ...Differential cross sections for the elastic scattering of electrons by H2 at 100 eV and 150 eV have been calculated and compared with experiments.We use the momentum space method in which the electron-molecule system has a single centre and the interaction of electron-nuclei is expanded by a multipole expansion.The static exchange calculation is supplemented by a phenomenological polarization potential.Electron-molecule scattering is reduced to an electronic problem by the Born--Oppenheimer approximation,using closure over the vibrational and rotational states.展开更多
基金supported by the National Natural Science Foundation of China (Grant No.60978016)the Technological Project of Heilongjiang Province,China (Grant No.GC06A116)the Fundamental Research Funds for the Central Universities,China (Grant No.HIT.NSRIF.201165)
文摘The thermal effect and the heat generation in diode-end-pumped continuous-wave 914-nm Nd：YVO4 lasers are investigated in detail. A theoretical model of a diode end-pumped solid-state laser is constructed to analyse the influence of fractional thermal loading on the thermal effect in the Nd：YVO4 laser based on finite element analysis. The thermal focal lengths and the end-surface deformations of laser rods in Nd：YVO4 quasi-three-level and four-level lasers are measured and compared with the results obtained by ordinary interferometry for the demonstration of higher thermal loading in 914-nm laser. Finally the fractional thermal loading in the Nd：YVO4 quasi-three-level laser is calculated by matching the experimental and the simulated end deformations.
基金Supported by the National Natural Science Foundation of China under Grant No.19574021Tunable Laser Technology National Key Laboratory of Harbin Institute of Technologythe National Doctoral Foundation of China Education Minis try.
文摘Differential cross sections for the elastic scattering of electrons by H2 at 100 eV and 150 eV have been calculated and compared with experiments.We use the momentum space method in which the electron-molecule system has a single centre and the interaction of electron-nuclei is expanded by a multipole expansion.The static exchange calculation is supplemented by a phenomenological polarization potential.Electron-molecule scattering is reduced to an electronic problem by the Born--Oppenheimer approximation,using closure over the vibrational and rotational states.
