New algorithm of knife-edge method measuring the size of hat spot and Gaussian spot
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Graduate University, Chinese Academy of Science, Beijing 100080, China;
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The Academy of Opto-electronic, Chinese Academy of Science, Beijing 100094, China;
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Beijing GK Laser Technology Co., Ltd., Beijing 100085, China
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Corresponding author:
FAN Zhong-wei, fanzhongwei@aoc.ac.cn
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Received Date:
2012-05-02
Accepted Date:
2012-07-17
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Abstract
In order to measure the radius of hat spots and Gaussian spots, knife-edge method was adopted for the theoretical analysis and experimental verification. A new iterative algorithm was proposed. The distance of knife-edge is in direct proportion to the radius of spot. The corresponding scale factors were calculated. It is convenient to obtain the radius of spots by multiplying a corresponding scale factor to the distance of knife-edge. The result shows this iterative algorithm is also valid for any spot whose distribution of intensity is already known.
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