| 用K参数描述光强陡峭度的有效性研究 |
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| 引用本文： | 康小平,吕百达. 用K参数描述光强陡峭度的有效性研究[J]. 激光技术, 2005, 29(4): 426-428 |
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| 作者姓名： | 康小平 吕百达 |
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| 作者单位： | 四川大学,激光物理与化学研究所,成都,610064;琼州大学,物理系,五指山,572200;四川大学,激光物理与化学研究所,成都,610064 |
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| 基金项目： | 国家高技术基金资助项目(A823070) |
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| 摘 要： | 光束光强分布的陡峭度或平整度通常可用陡峭度参数(K参数)来描述。以双曲余弦-高斯光束、贝塞尔函数调制的高斯光束和平顶高斯光束3种光束为例,给出了详细的数值计算和物理解释。研究表明,K参数只适用于描述呈钟形光束剖面的陡峭度,但不适用于有强衍射旁瓣、强调制或有中心凹陷的光束。
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| 关 键 词： | 光束描述 陡峭度参数(K参数) 双曲余弦-高斯光束 贝塞尔函数调制的高斯光束 平顶高斯光束 |
| 文章编号： | 1001-3806(2005)04-0426-03 |
| 收稿时间： | 2004-05-11 |
| 修稿时间： | 2004-05-11 |
Applicability of kurtosis parameter characterizing the degree of sharpness of beam intensity distribution |
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| KANG Xiao-ping,Lü Bai-Da. Applicability of kurtosis parameter characterizing the degree of sharpness of beam intensity distribution[J]. Laser Technology, 2005, 29(4): 426-428 |
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| Authors: | KANG Xiao-ping Lü Bai-Da |
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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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| Keywords: | beam characterization kurtosis parameter(K parameter) cosh-Gaussian(ChG) beam Bessel-modulated Gaussian (QBG) beam flattened Gaussian (FG) beam |
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