| 椭圆平顶高斯光束及其传输特性 |
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| 引用本文： | 蔡阳健,林强. 椭圆平顶高斯光束及其传输特性[J]. 强激光与粒子束, 2001, 13(3): 267-271 |
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| 作者姓名： | 蔡阳健 林强 |
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| 作者单位： | 浙江大学 物理系光学研究所，浙江 杭州 310028 |
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| 基金项目： | 霍英东教育基金会青年教师基金!(710 0 9)，浙江省自然科学基金青年科技人才专项基金!(RC980 2 9)，国家自然科学基金!(6 0 0 780 0 3) |
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| 摘 要： | 用张量光学方法定义了三维不可分离变量的椭圆平顶高斯光束(EFGB)，导出了这种光束经过非轴对称光学系统的传输公式及相应的张量ABCD定律, 并对EFGB经过自由空间的传输作了数值计算。结果表明, EFGB的传输特性依赖于阶次, 而且耦合EFGB的光强分布在传输过程中会发生旋转。
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| 关 键 词： | 椭圆平顶高斯光束 张量ABCD定律 光束传输 |
| 文章编号： | 1001-4322(2001)03-0267-05 |
| 收稿时间： | 2000-08-25 |
| 修稿时间： | 2000-08-25 |
Elliptical flattened Gaussian beam and it's propagation characteristics |
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| CAI Yang-jian,LIN Qiang. Elliptical flattened Gaussian beam and it's propagation characteristics[J]. High Power Laser and Particle Beams, 2001, 13(3): 267-271 |
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| Authors: | CAI Yang-jian LIN Qiang |
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| Affiliation: | Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310028, China |
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| Abstract: | The elliptical flattened Gaussian beam (EFGB) is defined by using tensor method. The propagation formula and corresponding tensor ABCD law of EFGB passing through nonsymmetrical paraxial optical system is derived through vector integration. By using this formula, the propagation characteristics of EFGB through free space are calculated and discussed. The results show that the propagation property is very different from those of circular flattened Gaussian beam or elliptical Gaussian beam, and is dependent on the order N . In the near field, the intensity distribution remains flat. With the increase of propagation distance, the flattened part degenerates. In the far field, EFGB tends to be elliptical Gaussian beam. Furthermore, beam spots of coupled EFGB rotate with propagation distance z. |
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| Keywords: | elliptical flattened Gaussian beam tensor ABCD law beam propagation |
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