Reference systems for laser beam quality and parameter measurements

Xu Dagang; Chong Ma; Zhengqiang Guo; Zheng Lu

doi:10.1117/12.253268

30 September 1996 Reference systems for laser beam quality and parameter measurements

Xu Dagang, Chong Ma, Zhengqiang Guo, Zheng Lu

Proceedings Volume 2889, High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers; (1996) https://doi.org/10.1117/12.253268
Event: Photonics China '96, 1996, Beijing, China

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.

Citation Download Citation

Xu Dagang, Chong Ma, Zhengqiang Guo, and Zheng Lu "Reference systems for laser beam quality and parameter measurements", Proc. SPIE 2889, High-Power Lasers: Solid State, Gas, Excimer, and Other Advanced Lasers, (30 September 1996); https://doi.org/10.1117/12.253268

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KEYWORDS

Optical testing

Laser beam propagation

Continuous wave operation

Nd:YAG lasers

Pulsed laser operation

Beam analyzers

Helium neon lasers

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