In this study, Yb immobilized NaY zeolite catalyst（Yb/NaY） was obtained by a hydrothermal method and characterized by XRD, BET, FT-IR, ICP-AES, and NH3-TPD. The catalyst displayed good catalytic activity when applie...In this study, Yb immobilized NaY zeolite catalyst（Yb/NaY） was obtained by a hydrothermal method and characterized by XRD, BET, FT-IR, ICP-AES, and NH3-TPD. The catalyst displayed good catalytic activity when applied to the synthesis of quinoxalines via condensation of a-hydroxyketones with 1,2-diamines,and could be reused several times without any loss of catalytic activity.展开更多
The passively Q-switched Yb：NaY（W04）2 （Yb：NaYW） laser is studied. By using Cr^4＋ ： yAG as the saturable absorber, a very stable pulse train is obtained. At a high pump power, the pulse to pulse timing jitter i...The passively Q-switched Yb：NaY（W04）2 （Yb：NaYW） laser is studied. By using Cr^4＋ ： yAG as the saturable absorber, a very stable pulse train is obtained. At a high pump power, the pulse to pulse timing jitter is measured to be less than 2% and the amplitude fluctuation is less than 4%. A Q-switched average output power of 2.3 W at 1029 nm is generated with a slope efficiency of 33.9%; the one-dimensional intensity distribution of the laser facula is of the Gaussian type. The output repetition rate, pulse energy, pulse width and peak power are 33.3 kHz, 70μJ, 36 ns and 2.0 k W, respectively. The passively Q-switched process is simulated by solving the rate equations, the simulated results are in good agreement with the experimental data.展开更多
基金the National Natural Science Foundation of China (No. 20802052) for financial support
文摘In this study, Yb immobilized NaY zeolite catalyst（Yb/NaY） was obtained by a hydrothermal method and characterized by XRD, BET, FT-IR, ICP-AES, and NH3-TPD. The catalyst displayed good catalytic activity when applied to the synthesis of quinoxalines via condensation of a-hydroxyketones with 1,2-diamines,and could be reused several times without any loss of catalytic activity.
基金Supported by the National Natural Science Foundation of China under Grant No 61405171the Natural Science Foundation of Shandong Province under Grant No ZR2012FQ014the Science and Technology Program of the Shandong Higher Education Institutions of China under Grant No J13LJ05
文摘The passively Q-switched Yb：NaY（W04）2 （Yb：NaYW） laser is studied. By using Cr^4＋ ： yAG as the saturable absorber, a very stable pulse train is obtained. At a high pump power, the pulse to pulse timing jitter is measured to be less than 2% and the amplitude fluctuation is less than 4%. A Q-switched average output power of 2.3 W at 1029 nm is generated with a slope efficiency of 33.9%; the one-dimensional intensity distribution of the laser facula is of the Gaussian type. The output repetition rate, pulse energy, pulse width and peak power are 33.3 kHz, 70μJ, 36 ns and 2.0 k W, respectively. The passively Q-switched process is simulated by solving the rate equations, the simulated results are in good agreement with the experimental data.
