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Proceedings Paper

Beam quality measurements by modal decomposition using a spatial light modulator
Author(s): Shaohua Pan; Jun Ma; Hailun Liu; Tu Ba
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Paper Abstract

We present a fast , easy and real-time method for measuring the laser beam quality factor, M2 , using a spatial light modulator(SLM). We import computer-generated holograms into the spatial light modulator. Then the laser beams are reflected by the SLM and transfer through a fourier transform lens, composed into different kinds of modes which are received by a CCD. The M2 value can be obtained by analyzing and calculating the modal weighting coefficients of different modes. In this paper, two different kinds of softwares , Matlab and VirtualLab, are used to implement the numerical simulations of the experiment process, so that the feasibility of the algorithm can be proved. In the end, we set up the experimental platform and implement the experiments with measuring laser beam quality factor, M2 , using a he-ne laser as the light source. The comparison with the theoretical value and the simulative value proves the reliability of the experiments.

Paper Details

Date Published: 28 October 2016
PDF: 8 pages
Proc. SPIE 9683, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 96831E (28 October 2016); doi: 10.1117/12.2241730
Show Author Affiliations
Shaohua Pan, Nanjing Univ. of Science and Technology (China)
Jun Ma, Nanjing Univ. of Science and Technology (China)
Hailun Liu, Nanjing Univ. of Science and Technology (China)
Tu Ba, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 9683:
8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Wenhan Jiang; Li Yang; Oltmann Riemer; Shengyi Li; Yongjian Wan, Editor(s)

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