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Title: Exploring transverse pattern formation in a dual-polarization self-mode-locked monolithic Yb: KGW laser and generating a 25-GHz sub-picosecond vortex beam via gain competition
Authors: M. T. Chang
H. C. Liang
K. W. Su
Y. F. Chen
Contributors: 國立臺灣海洋大學:光電與材料科技學士學位學程(學系)
Date: 2016-04
Issue Date: 2018-11-27
Publisher: Optics Express
Abstract: Abstract: Formation of transverse modes in a dual-polarization self-mode-locked monolithic Yb: KGW laser under high-power pumping is thoroughly explored. It is experimentally observed that the polarization-resolved transverse patterns are considerably affected by the pump location in the transverse plane of the gain medium. In contrast, the longitudinal self-mode-locking is nearly undisturbed by the pump position, even under the high-power pumping. Under central pumping, a vortex beam of the Laguerre-Gaussian LGp,l mode with p = 1 and l = 1 can be efficiently generated through the process of the gain competition with a sub-picosecond pulse train at 25.3 GHz and the output power can be up to 1.45 W at a pump power of 10.0 W. Under off-center pumping, the symmetry breaking causes the transverse patterns to be dominated by the high-order Hermite-Gaussian modes. Numerical analyses are further performed to manifest the symmetry breaking induced by the off-center pumping.
Relation: 24(8) pp.8754-8762
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51380
Appears in Collections:[光電科學研究所] 期刊論文

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