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Proceedings Paper

Reference systems for laser beam quality and parameter measurements
Author(s): Xu Dagang; Chong Ma; Zhengqiang Guo; Zheng Lu
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Paper Abstract

Three reference systems for the calibration and comparison of beam parameter measurements and beam quality of cw and pulsed lasers at NIM are described. While the cross- sectional power/energy density distribution function of TEM00 He-Ne laser and pulsed Nd:YAG laser are detected by a CCD-camera, the power density distribution function of cw CO2 laser is scanned by a liquid nitrogen cooled TeCdHg detector. Test procedures and evaluations are referred to ISO/DIS 11146 document. From the measured cross- sectional distribution function, the first and second spatial moments as well as the beam width are calculated. The waist location and width are determined by a hyperbolic fit to different measurements of the beam width along the propagation axis. The error evaluation equations for beam parameter measurement have been derived. Measurement agreements using different test methods and instruments are studied. Varieties of beam characteristics and measurement uncertainty for two measuring apparatus are given.

Paper Details

Date Published: 30 September 1996
PDF: 11 pages
Proc. SPIE 2889, High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers, (30 September 1996); doi: 10.1117/12.253268
Show Author Affiliations
Xu Dagang, National Institute of Metrology (China)
Chong Ma, National Institute of Metrology (China)
Zhengqiang Guo, National Institute of Metrology (China)
Zheng Lu, National Institute of Metrology (China)

Published in SPIE Proceedings Vol. 2889:
High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers
Sui-Sheng Mei; Keith A. Truesdell, Editor(s)

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