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Proceedings Paper

The research on measurement technology of high dynamic range laser focal spot
Author(s): Zhengzhou Wang; Bingliang Hu; Qinye Yin; Shikang Cao; Wei Wang
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Paper Abstract

In order to obtain the far-field distribution of high dynamic range laser focal spot, the mathematical model of schlieren method to measure the far-field focal spot was proposed, and the traditional schlieren reconstructed algorithm was optimized in many aspects in this paper. First of all, the mathematical model which used to measure the far-field focal spot was created, the amplificatory coefficient K of the main lobe intensity and amplificatory coefficient b of the laser spot area were selected ; Secondly, the two important parameters were calibrated and the accurate main lobe spot and side lobe spot were captured by the integrated diagnostic beam fast automatic alignment system; Finally, the schlieren reconstructed algorithm was optimized by circle fitting method to calculate side lobe image center and weighted average method to fuse the joint image edge, and the error of traditional schlieren reconstruction method for side lobe center was reduced and the obvious joint mark of reconstructed image was eliminated completely. The method had been applied in a certain laser driver parameter measurement integrated diagnostic system to measure far-field laser focal spot. The experimental results show that the method can measure the far-field distribution of high dynamic range laser focal spot exactly on the condition that the parameter of mathematical model is calibrated accurately and the reconstructed algorithm of schlieren measure is optimized excellently.

Paper Details

Date Published: 8 October 2015
PDF: 8 pages
Proc. SPIE 9677, AOPC 2015: Optical Test, Measurement, and Equipment, 96772T (8 October 2015); doi: 10.1117/12.2197290
Show Author Affiliations
Zhengzhou Wang, Xi'an Jiaotong Univ. (China)
Univ. of Chinese Academy of Sciences (China)
Xi'an Institute of Optics and Precision Mechanics (China)
Bingliang Hu, Xi'an Institute of Optics and Precision Mechanics (China)
Qinye Yin, Xi'an Jiaotong Univ. (China)
Shikang Cao, Xi'an Institute of Optics and Precision Mechanics (China)
Wei Wang, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 9677:
AOPC 2015: Optical Test, Measurement, and Equipment
Sen Han; Jonathan D. Ellis; Junpeng Guo; Yongcai Guo, Editor(s)

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