Browsing by Author "Lin, Haifeng"

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Direct generation of an optical vortex beam from a diode-pumped Yb:MgWO4 laser
(2017-08-01)
Lu, Jieling
;
Lin, Haifeng
;
Zhang, Ge
;
Li, Bingxuan
;
Zhang, Lizhen
We report for the first time, to the best of our knowledge, the generation of a multi-watt optical vortex beam based on a novel monoclinic Yb3+-doped MgWO4 crystal. The robust first-order Laguerre-Gaussian doughnut beam (LG(01)) with high mode purity and good beam quality can be selectively excited without using any intra-cavity handedness-selective element. Our results demonstrate the potential of the Yb: MgWO4 crystal for generation of high-power optical vortex beams from compact solid-state lasers.
Manipulation of linearly polarized states in a diode-pumped YAG/Tm:YAG/YAG bulk laser
(2014-04-01)
Li, Yanying
;
Chen, Weidong
;
Lin, Haifeng
;
Ke, Da
;
Zhang, Ge
We experimentally demonstrated the manipulation of 2 mu m linearly polarized states in a diode-pumped YAG/Tm: YAG/YAG laser with high polarization extinction ratio of 28 dB for the very first time to the best of our knowledge. A stable linearly polarized state of 2 mu m was achieved without using any specific intracavity optical polarization-selected elements. The unexpected phenomenon of tunable linear polarization directions was observed. Multidistinct linear polarization directions were experimentally obtained, including the peculiar case of switchable orthogonally linear polarization directions. (C) 2014 Optical Society of America