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High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation

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Abstract

The criterion of achieving efficient passive Q-switching is analyzed to design an off-axis pumped Nd:YVO4/Cr4+:YAG laser with a degenerate cavity. Experimental results reveal that pure high-order HG0,m or HGm,0 eigenmodes with the order m between 0 and 14 can be generated, depending on the off-axis displacement along the y axis or the x axis. On the other hand, lasing modes naturally turn into planar geometric modes when the off-axis displacement is larger than the value for exciting the HG0,m or HGm,0 eigenmodes with m>14. The overall peak powers for high-order eigenmodes or geometric modes can exceed 140 W. Furthermore, the high-order eigenmodes and geometric modes are employed to generate vortex beams with large orbital angular momentum by using an external cylindrical mode converter. Theoretical analyses are performed to confirm experimental results and to manifest the phase structures of the generated vortex beams.

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DOI:10.1364/prj.5.000561

基金项目:Ministry of Science and Technology, Taiwan (MOST)10.13039/501100004663 (106-2628-M-009-001); National Natural Science Foundation of China (NSFC)10.13039/501100001809 (11404332, 61575119); 1000 Talents Program (short-term).

收稿日期:2017-08-24

录用日期:2017-09-15

网络出版日期:2017-09-17

作者单位    点击查看

Y. F. Chen:Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
C. C. Chang:Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
C. Y. Lee:Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
C. L. Sung:Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
J. C. Tung:Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
K. W. Su:Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan
H. C. Liang:Institute of Optoelectronic Science, National Taiwan Ocean University, Keelung 20224, Taiwan
W. D. Chen:Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
G. Zhang:Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China

联系人作者:Y. F. Chen(yfchen@cc.nctu.edu.tw)

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引用该论文

Y. F. Chen, C. C. Chang, C. Y. Lee, C. L. Sung, J. C. Tung, K. W. Su, H. C. Liang, W. D. Chen, and G. Zhang, "High-peak-power large-angular-momentum beams generated from passively Q-switched geometric modes with astigmatic transformation," Photonics Research 5(6), 561-566 (2017)

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