CHOICE OF CLIP LEVELS FOR BEAM WIDTH MEASUREMENTS USING KNIFE-EDGE TECHNIQUES
CHOICE OF CLIP LEVELS FOR BEAM WIDTH MEASUREMENTS USING KNIFE-EDGE TECHNIQUES
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DOI：
10.1109/3.83346
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发表时间：
1991-04-01
影响因子：
2.5
通讯作者：
JOHNSTON, TF
中科院分区：
文献类型：
--
作者：
SIEGMAN, AE;SASNETT, MW;JOHNSTON, TF
扫描刀口技术为测量具有任意或不规则横向轮廓的光束的宽度提供了较好的方法之一。然而，要实现这种方法，必须同时选择限幅电平和比例因数，以将测量的限幅宽度转换为激光的有效宽度。结果表明，用这种方法测量束宽的最佳限幅能级应该选择在几乎等于8.5%和几乎等于11.6%的范围内。在此范围内适当匹配的限幅电平和标度因子，对于TEM00高斯光束，可以准确地将测量的限幅宽度转换为标准差，而对于其他更高阶或质量较差的大范围的光束轮廓，转换系数只会变得略有不准确。
The scanning knife-edge technique provides one of the better methods for measuring the width of an optical beam having an arbitrary or irregular transverse profile. To implement this method, however, one must select both a clip level and a scale factor for converting the measured clip width into an effective width of the laser beam. We show that the preferred clip level for beam width measurements using this technique should be chosen in the range between epsilon almost-equal-to 8.5% and epsilon almost-equal-to 11.6%. With a suitably matched clip level and scale factor within this range, the conversion from measured clip width to standard deviation can be made exactly accurate for TEM00 Gaussian beams, and the conversion factor will become only slightly inaccurate for a wide range of other higher-order or poorer-quality beam profiles.