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| 光束束宽概念和不同定义束宽的比较 | |
| 引用本文： | 朱莉华,聂义友,吕百达,. 光束束宽概念和不同定义束宽的比较[J]. 光子学报, 2005, 34(10): 1476-1479 |
| 作者姓名： | 朱莉华 聂义友 吕百达 |
| 作者单位： | [1]江西师范大学物理与通信电子学院,江西南昌330027 [2]四川大学激光物理与化学研究所,四川成都610064 |
| 基金项目： | 江西省自然科学基金资助课题. |
| 摘 要： | 对束宽的不同定义作了比较研究.结果表明,不同定义束宽的数值是不同的.在自由空间中传输时,二阶矩束宽遵守ABCD定律,熵束宽的传输曲线近似于双曲线,但环围功率束宽一般不满足ABCD定律.双曲余弦高斯光束按二阶矩束宽和熵束宽法所得焦移几乎相同,而环围功率法所得焦移则与之不同. |
| 关 键 词： | 激光光学 束宽 二阶矩 熵束宽 环围功率 |
| 收稿时间： | 2005-03-02 |
| 修稿时间： | 2005-03-02 |
The Concept of the Beam Width and Comparison of Its Different Definitions |
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| Zhu Lihua, Nie Yiyou, Lti Baida,(.College of Physics. The Concept of the Beam Width and Comparison of Its Different Definitions[J]. Acta Photonica Sinica, 2005, 34(10): 1476-1479 | |
| Authors: | Zhu Lihua Nie Yiyou Lti Baida (.College of Physics |
| Affiliation: | Zhu Lihua, Nie Yiyou, Lti Baida,(1.College of Physics |
| Abstract: | A comparative study of different definitions of the beam width was made. It was shown that there were different values of the beam width in accordance with different definitions. The propagation of the second-order-moment-based width obeyed the ABCD law,and the propagation curve of the entropy-based width was approximately a hyperbola, but for the power-in the bucket-based width the ABCD law failed. There were nearly the same focal shifts of Cosh-Gaussian (ChG) beams for the second-order-moment-based width and entropy-based width, whereas it was not the case for the power-in the bucket-based width. |
| Keywords: | Laser optics ~ Beam width ~ Second-order-moment ~ Entropy-based width ~ Power in the bucket |
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