红外与激光工程, 2007, 36 (1): 47, 网络出版: 2007-05-23   

对激光光束质量一些问题的认识

Some aspects of laser beam quality
作者单位
1 四川大学,激光物理与化学研究所,四川,成都,610064
2 琼州大学,物理系,海南,五指山,572200
摘要
从对激光光束质量研究进展开始,讨论了在傍轴和非傍轴范畴内激光光束质量的一些问题,主要是非傍轴光束的光束质量评价.光束传输的非傍轴矢量二阶矩理论可用于计算多种非傍轴光束的M2因子,但对M2因子的物理解释却有困难.例如,在非傍轴范畴,M2因子依赖于束腰宽度与波长之比,并可小于1.但远场发散角之值可趋于90°,这将导致很大的M2因子值.另一方面,若将公式中的光强用时间平均坡印廷矢量z分量代替,桶中功率(PIB),或等价地,β参数可推广用于评价非傍轴光束的远场光束质量.PIB表征了光束功率的可聚焦能力,是一种简明、直观评价不同激光光束的方法.然而,在β参数的公式中的束宽是按功率含量百分比定义的,因此双曲线传输规律不再严格成立.
Abstract
参考文献

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吕百达, 康小平. 对激光光束质量一些问题的认识[J]. 红外与激光工程, 2007, 36(1): 47. 吕百达, 康小平. Some aspects of laser beam quality[J]. Infrared and Laser Engineering, 2007, 36(1): 47.

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