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Measuring effective area of spots from pulsed laser beams

机译:测量脉冲激光束的有效斑点面积

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摘要

The effective area of a laser spot is an important quantity used to characterize the laser-induced damage threshold of optical materials according to ISO 21254-1:2011 standard. A method for measuring the effective area/diameter of spots from pulsed laser beams using charge-coupled device camera-based beam profilers is presented. Factors affecting the measurement's accuracy, as the background noise and the size of the summation area, were evaluated using MATLAB~®. To minimize the noise contribution, we use an iterative method similar to the one used to measure the second-moment-based spot sizes. We find that the two analyzed components of the background noise, its zero-mean noise and its offset, have an opposite effect on the measurements of the effective area/diameter as compared with the second-moment-based measurements. We prove that there is an upper limit of the relative error of such iterative measurements of effective area, the iteration limit parameter, and that it is a measurable quantity. We measure the effective area/diameter of laser spots with different sizes from a Nd:YAG laser at 1064 nm, 6 ns pulse duration, 10 Hz repetition frequency, and estimate the standard uncertainty of the measurements. Further, we generalize the effective area/ diameter concept to include elongated (elliptical/rectangular) spots.
机译:激光光斑的有效面积是根据ISO 21254-1:2011标准来表征光学材料的激光诱导损伤阈值的重要量。提出了一种基于电荷耦合器件相机的光束轮廓仪来测量脉冲激光束光斑有效面积/直径的方法。使用MATLAB〜®评估了影响测量精度的因素,例如背景噪声和求和区域的大小。为了使噪声贡献最小化,我们使用一种类似于用于测量基于第二矩的光斑尺寸的迭代方法。我们发现,与基于第二时刻的测量相比,背景噪声的两个分析成分,即零均值噪声及其偏移,对有效面积/直径的测量具有相反的影响。我们证明了有效面积的这种迭代测量的相对误差上限,迭代极限参数,并且它是可测量的量。我们用Nd:YAG激光在1064 nm,6 ns脉冲持续时间,10 Hz重复频率下测量不同尺寸的激光光斑的有效面积/直径。并估算测量的标准不确定度。此外,我们将有效面积/直径概念概括为包括细长的(椭圆/矩形)斑点。

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