Applicability of kurtosis parameter characterizing the degree of sharpness of beam intensity distribution
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1.
Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China;
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2.
Department of Physics, Qiongzhou University, Wuzhishan 572200, China
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Received Date:
2004-05-11
Accepted Date:
2004-06-15
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Abstract
It is known that usually the degree of sharpness (or flatness) of beam intensity distribution is described by the kurtosis parameter (K parameter).Taking cosh-Gaussian (ChG),Bessel-modulated Gaussian (QBG),and flattened Gaussian (FG) beams as three illustrative examples,detailed numerical calculations and physical interpretations were given.It is shown that the K parameter is suited essentially to characterize the sharpness of the bell-shape beam profile,but not applicable to beams with large diffraction sidelobes,large intensity modulations,and beams with central shadow.
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