Investigation on the experimental measurement of laser beam quality
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摘要: 采用CCD系统实验测量了LD泵浦Nd:YAG激光器的光束质量参数,研究了CCD系统的背景噪声特性和积分区域选取对光束质量参数测量的影响,从实验数据中得到以下结论:(1)在有、无背景光两种条件下,背景记数强烈地依赖于曝光时间和像素的合并,温度影响可以忽略不计;(2)为获得M2合理的测量结果,至少要选择5%积分区域。Abstract: The beam quality of a LD pumped Nd:YAG laser is measured with CCD camera system. The background characteristics of the CCD system and the influence of the size of integral box upon measurement results are investigated. The following conclusions can be derived form experimental results: (1) Background is strongly depend upon exposure time and pixel binning,while temperature has an ignorable effect upon it,whether with or without ambient light. (2) A 5%-cut is the minimum value in order to get a reasonable result.
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Keywords:
- M2 factor /
- CCD camera /
- beam quality
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[1] Document ISO/TC172/SC9/WG1/N56,Milan,Italy,1993
[2] Champagne Y,Belanger P A.Opt & Quant Electron,1995;(27):813～824
[3] 庞长富．激光束传输特性参数测量与评价的研究．北京理工大学博士学位论文,1997
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