光学元件激光损伤阈值的指数拟合法以及测试误差分析

利用指数拟合法拟合损伤概率,获取1-on-1激光损伤阈值;分析了测试光斑面积以及单脉冲能量台阶取样点数对损伤概率的影响。采用理论推导得到了缺陷按完全简并模型分布时的损伤概率表示式,做进一步的修改使之适用于非完全简并情况从而得到了指数拟合公式,并通过实验比较了直线拟合与指数拟合的结果,证明了指数拟合法的优越性;计算模拟研究了测试光斑面积以及单脉冲能量台阶取样点数对测试误差的影响,发现测试光斑面积越大、取样点数越多则测试结果越准确。

Exponential Fitting of Laser Damage Threshold and Analysis of Testing Errors

The exponential fitting model of damage probability and 1-on-1 laser damage threshold of optical components was presented,and the effects of irradiated spot size and number of spots tested for one pulse energy density on damage probability were investigated.The damage probability was calculated,when the defects is distributed as complete degeneracy,and then further modification was done to fit the incomplete degeneracy situation.The damage probability to fit the damage data is called exponential fitting model and the experiment results in the paper showed that the exponential fitting could get more accurate damage threshold.The test errors induced by laser beam spot and the sites tested at one pulse energy density were studied through numerical simulation.It is shown that the larger beam area and more sites exposed at one pulse energy density,the more accuracy of damage possibility.