激光损伤阈值:有用的想法还是危险的误解?

J. Arenberg
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引用次数: 2

摘要

激光损伤阈值作为安全操作水平的概念既有用又令人困惑。本文对激光损伤阈值的概念进行了检验和分析,指出了激光损伤阈值在使用中的好处和危险。激光损伤阈值的定义和概念的历史可以追溯到最早的激光时代,直到今天。提出了精确阈值测量的标准,并推导了光学器件上最弱点的分布,为分析提供了基础。利用教学方法选择的缺陷分布,得出了最薄弱部位的统计数据。最弱部位对试验面积的依赖性得到了明确的显示。有人认为,典型的小区域试验,即大多数主流损伤试验的特点,没有足够的面积包括真正最薄弱的部位,因此通常是不准确的。最后,对如何重新定义阈值测量技术,以获得更准确的测试程序提出了一些看法。
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Laser damage threshold: useful idea or dangerous misconception?
The concept of a laser damage threshold as a safe operating level is both useful and confounding. This paper examines and analyzes the power of the concept of a laser damage threshold, identifying the good and the danger in its use. The history of the definition and concept of the laser damage threshold is traced from the earliest days of the laser through to the present day. Criteria for an accurate threshold measurement are presented and distribution of the weakest site on an optic is derived to provide a basis of analysis. Using a pedagogically selected defect distribution, the statistics of the weakest site are derived. The dependence of the weakest site on the area of the test is shown explicitly. It is argued that typical small area tests, characteristic of most main stream damage tests have insufficient area to include the true weakest site, and are therefore generally inaccurate. The paper concludes with some ideas on how to redefine the threshold measurement technique resulting in a more accurate test procedure.
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