A model for a laser with dual-pass pumping is established, and an equation expressing the mode matching for this structure is presented. Through the numerical analysis of this equation, under the conditions of weak-ab...A model for a laser with dual-pass pumping is established, and an equation expressing the mode matching for this structure is presented. Through the numerical analysis of this equation, under the conditions of weak-absorption and effective absorption efficiency, the optimum radius of the pump beam waist as well as the optimum location is fitted to simple formulas, considering the quality of the pump beam, absorption coefficient, and beam waist of the cavity mode.Using these formulas, the laser with dual-pass pumping could be optimized to obtain a high slope efficiency. To test the utility of this model, an Nd：YVO4 laser with dual-pass pumping and weak-absorption was built and optimized according to the results of the calculation. A good agreement between the results of the calculations and the experiment verified the model and the numerical analysis.展开更多
Based on hydromachanics and the law of conservation of energy by means of the Bernoulli Equation, the matching relation of a pump pressure and delivery, losing energy of the magma when it flows along the pipes are res...Based on hydromachanics and the law of conservation of energy by means of the Bernoulli Equation, the matching relation of a pump pressure and delivery, losing energy of the magma when it flows along the pipes are researched. This thesis provide the theoretical basis for equipment selection and selection of pipeline.展开更多
We demonstrate a diode-pump Tm^（3＋）t-doped all-fiber laser operating at 1908 nm based on a master oscillator power amplifier（MOPA） configuration. In our work, 152 W of laser output power is generated by a total i...We demonstrate a diode-pump Tm^（3＋）t-doped all-fiber laser operating at 1908 nm based on a master oscillator power amplifier（MOPA） configuration. In our work, 152 W of laser output power is generated by a total incident pump power of 434 W at 790 nm, corresponding to the total optical efficiency of 35%. The laser wavelength is1908.29 nm. To the best of our knowledge, it is the highest output power reached around 1908 nm with such a narrow linewidth of 0.18 nm based on a MOPA configuration.展开更多
文摘A model for a laser with dual-pass pumping is established, and an equation expressing the mode matching for this structure is presented. Through the numerical analysis of this equation, under the conditions of weak-absorption and effective absorption efficiency, the optimum radius of the pump beam waist as well as the optimum location is fitted to simple formulas, considering the quality of the pump beam, absorption coefficient, and beam waist of the cavity mode.Using these formulas, the laser with dual-pass pumping could be optimized to obtain a high slope efficiency. To test the utility of this model, an Nd：YVO4 laser with dual-pass pumping and weak-absorption was built and optimized according to the results of the calculation. A good agreement between the results of the calculations and the experiment verified the model and the numerical analysis.
文摘Based on hydromachanics and the law of conservation of energy by means of the Bernoulli Equation, the matching relation of a pump pressure and delivery, losing energy of the magma when it flows along the pipes are researched. This thesis provide the theoretical basis for equipment selection and selection of pipeline.
基金supported by the National Natural Science Foundation of China(Nos.61308009 and61405047)the China Postdoctoral Science Foundation Funded Projects(Nos.2013M540288 and 2015M570290)+2 种基金the Fundamental Research Funds for the Central Universities Grant(Nos.HIT.NSRIF.2014044 and HIT.NSRIF.2015042)the Science Fund for Outstanding Youths of Heilongjiang Province(No.JQ201310)the Heilongjiang Postdoctoral Science Foundation Funded Projects(No.LBH-Z14085)
文摘We demonstrate a diode-pump Tm^（3＋）t-doped all-fiber laser operating at 1908 nm based on a master oscillator power amplifier（MOPA） configuration. In our work, 152 W of laser output power is generated by a total incident pump power of 434 W at 790 nm, corresponding to the total optical efficiency of 35%. The laser wavelength is1908.29 nm. To the best of our knowledge, it is the highest output power reached around 1908 nm with such a narrow linewidth of 0.18 nm based on a MOPA configuration.
