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Proceedings Paper

Numerical study of the measurement capability of quadriwave lateral shearing interferometry for multimode fiber laser (Conference Presentation)
Author(s): Kun Xie; Wenguang Liu; Qiong Zhou; Hongmiao Zhao; Xiaojun Xu
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Paper Abstract

Quadriwave lateral shearing interferometry (QWLSI) could acquire the phase and intensity distribution of laser beam with remarkable resolution in only one measurement. It’s a potential method to measure the phase step of multimode laser. However, the discontinuity point of intensity will reduce the quality of interferogram and lead to wrong wavefront retrieve result. In this paper, analysis and simulations have been conducted on the measuring ability of the QWLSI for the higher-order modes (HOM) in large mode area (LMA) fiber. A set of interferogram image of ideal linearly polarized (LP) mode are calculated and analyzed by a commercial retrieve software. The results show that the proper ratio of the shearing distance to the gap size between HOM petals is the critical parameter to retrieve wavefront correctly. To study the influence of coherence on wavefront retrieving, we calculated the interferogram of multimode laser with different modal phase fluctuation. The results indicate that the partially coherent beam will introduce significant ambiguity into the retrieved wavefront. Finally, the feasibility of wavefront correction of multimode laser with LSI and spatial light modulator is demonstrated with simulations.

Paper Details

Date Published: 26 October 2017
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Proc. SPIE 10436, High-Power Lasers: Technology and Systems, Platforms, and Effects, 104360A (26 October 2017); doi: 10.1117/12.2277995
Show Author Affiliations
Kun Xie, National Univ. of Defense Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)
Hunan Provincial Collaborative Innovation Ctr. of High Power Fiber Laser (China)
Wenguang Liu, National Univ. of Defense Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)
Hunan Provincial Collaborative Innovation Ctr. of High Power Fiber Laser (China)
Qiong Zhou, National Univ. of Defense Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)
Hunan Provincial Collaborative Innovation Ctr. of High Power Fiber Laser (China)
Hongmiao Zhao, National Univ. of Defense Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)
Hunan Provincial Collaborative Innovation Ctr. of High Power Fiber Laser (China)
Xiaojun Xu, National Univ. of Defense Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)
Hunan Provincial Collaborative Innovation Ctr. of High Power Fiber Laser (China)


Published in SPIE Proceedings Vol. 10436:
High-Power Lasers: Technology and Systems, Platforms, and Effects
Harro Ackermann; Willy L. Bohn; David H. Titterton, Editor(s)

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