随着光学元件损伤阈值测试研究工作的深入开展,有效、准确地测量和描绘它们的激光损伤阈值需要考虑多个因素.从不同口径的测试光束入手,采用R∶1测试方式,运用R∶1平均阈值的新概念,讨论了相同样品用不同测试口径测试其损伤阈值时,所得测试结果与测试口径的关系.研究表明,随着测试口径的增大,相同样品的损伤阈值逐渐减小,当测试口径增大到一定值时,损伤阈值趋于稳定.

With the development of the study on laser induced damage threshold testing for optics, many factors need to be considered in measuring and showing the LIDT efficiently and accurately. In this paper, R to 1 test method was used in the laserinduced damage testing under different beam diameter. The new concept of R to 1 average damage threshold was used. The relationship between damage threshold and testing beam diameter was discussed. It shows that laser induced damage threshold continuously decreases as the testing beam diameter increases. When the testing beam diameter increases to a certain value, LIDT tends to be invariable.