期刊
OPTICS AND LASER TECHNOLOGY
卷 127, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2020.106185
关键词
Interference; Laser modes; Optical pumping; Optical resonators
资金
- NSAF [U1830123]
- National Natural Science Foundation of China [61627802]
- Natural Science Foundation of Jiangsu Province [BK20180460]
- High-Level Educational Innovation Team Introduction Plan of Jiangsu, China
In this work, we demonstrated, for the first time to the best of our knowledge, high-order vortex beams at 604 nm that were directly emitted from a Pr:YLF crystal laser. By combining a blue-diode-pumped v-type cavity for controllable Gouy phase introduction and off-axis crystal rotation for high-order HG modes generation, topological charged 604-nm vortex lasers were attained up to the third order. Furthermore, the vortex beams were found to be lasing at 604 nm that was often deemed less prone to lase compared with 607-nm in the same energy manifold. By a detailed spectroscopic study and rate equation analysis, we proposed and confirmed that the 604-nm transition of Pr:YLF crystal could be favorable in the vortex beam generation by a cavity-lossinduced gain switching process, in which the net gain at 604-nm could surpass that of 607-nm as the cavity loss was amassed beyond a threshold value.
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