| 增大Bessel光束无衍射距离的凹透镜系统 |
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| 引用本文： | 何艳林,沈栋辉,孙川,吴逢铁. 增大Bessel光束无衍射距离的凹透镜系统[J]. 红外与激光工程, 2016, 45(5): 518003-0518003(5). DOI: 10.3788/IRLA201645.0518003 |
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| 作者姓名： | 何艳林 沈栋辉 孙川 吴逢铁 |
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| 作者单位： | 1.华侨大学 信息科学与工程学院 福建省光传输与变换重点实验室,福建 厦门 361021 |
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| 基金项目： | 国家自然科学基金(61178015);福建省科技创新平台计划(2012H2002);泉州市科技重点项目(2014Z127) |
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| 摘 要： | 根据传统轴棱锥法产生Bessel光束的原理和凹透镜的几何光学效应,设计并模拟了一套提高Bessel光无衍射距离的光学系统。利用凹透镜的发散特性,将其分别放置在轴棱锥的前方与后方,使用Math CAD软件进行模拟并与传统轴棱锥法进行比较,得出结论:在轴棱锥前方放置凹透镜使Bessel光的无衍射距离从244 mm增大至638 mm,同时增大中心光斑半径。在轴棱锥后方放置凹透镜使Bessel光的无衍射距离从244 mm增大至406 mm。使用He-Ne激光作为光源进行实验验证,实验结果与理论分析及仿真模拟基本一致。可根据实际要求选择凹透镜的曲率半径和位置,得到无衍射距离较大、质量较高的Bessel光束。
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| 关 键 词： | 光学系统设计 Bessel光束 凹透镜 光路优化 |
| 收稿时间： | 2015-09-21 |
Concave lens system of increasing Bessel beam non-diffracting distance |
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| Affiliation: | 1.Fujian Key Laboratory of Optical Beam Transmission and Transformation,College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China |
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| Abstract: | A new optical system to increase the Bessel beam's diffraction-free distance was designed and simulated based on traditional axicon method and geometric optical effects of concave lens. In the system, the concave lens was placed in front or in rear of the axicon. By simulating this program with Math CAD and comparing with traditional axicon method, some results were obtained that the diffraction free distance was increased from 244 to 638 mm, with central spot magnified when the concave was placed in front, and was increased to 406 mm when the concave was placed in rear. He-Ne laser was used as light source, the experimental results are consistent with the theoretical analysis and numerical simulation. Therefore, a certain curvature radius of the concave lens and the position according to actual requirements can be chosen to obatin the Bessel beam with a longer diffraction free distance and higher quality. |
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