| 聚焦贝塞尔-高斯光束的焦开关效应 |
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| 引用本文： | 季小玲,吕百达.聚焦贝塞尔-高斯光束的焦开关效应[J].强激光与粒子束,2005,17(3):347-350. |
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| 作者姓名： | 季小玲 吕百达 |
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| 作者单位： | 四川师范大学,电子工程学院,四川,成都,610066;四川大学,激光物理与化学研究所,四川,成都,610064 |
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| 基金项目： | 四川省教育厅自然科学基金资助课题(2002A089) |
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| 摘 要： | 详细研究了贝塞尔-高斯光束被无光阑透镜聚焦后的焦开关效应。推导出了轴上最大光强位置满足的一元三次方程和相对跃迁量公式，并用数值计算对理论结果作了说明。研究表明，当光束参数大于2时，聚焦贝塞尔-高斯光束会有焦开关现象出现。相对跃迁量随着光束参数的增大而增大，轴上归一化光强最小值随着光束参数的增大而减小，并且当光束参数大于3.9时，轴上归一化光强最小值为零。
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| 关 键 词： | 贝塞尔-高斯光束 焦开关 无光阑透镜 光束参数 |
| 文章编号： | 1001-4322(2005)03-0347-04 |
| 收稿时间： | 2004/8/12 |
| 修稿时间： | 2004年8月12日 |
Focal switch effect of focused Bessel-Gaussian beams |
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| JI Xiao-ling,L Bai-da.Focal switch effect of focused Bessel-Gaussian beams[J].High Power Laser and Particle Beams,2005,17(3):347-350. |
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| Authors: | JI Xiao-ling L Bai-da |
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| Institution: | 1. College of Electronic Engineering, Sichuan Normal University, Chengdu 610066, China;2. Institute of Laser Physics and Chemistry, Sichuan University, Chengdu 610064, China |
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| Abstract: | The focal switch effect of Bessel-Gaussian beams focused by a thin lens without aperture is studied in detail. The third-order algebraic equation determining the position of the axial maximum intensity and the formula of the relative transition height are derived. Numerical calculation results are presented to illustrate the theoretical predictions. It is shown that, if the beam parameter is bigger than 2, the focal switch of Bessel-Gaussian beams can appear. The relative transition height increases with increasing the beam parameter. The normalized axial minimum intensity decreases with increasing the beam parameter, and the normalized axial minimum intensity is zero, as the beam parameter is bigger than 3.9. |
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| Keywords: | Bessel-Gaussian beams Focal switch Thin lens without aperture Beam parameter |
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