| 圆锥透镜对球面入射光的聚焦衍射特性 |
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| 引用本文： | 刘华,卢振武.圆锥透镜对球面入射光的聚焦衍射特性[J].光子学报,2005,34(1):126-128. |
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| 作者姓名： | 刘华 卢振武 |
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| 作者单位： | 中科院长春光机所应用光学国家重点实验室,吉林长春经济开发区东南湖大路16号,长春,130033;中科院长春光机所应用光学国家重点实验室,吉林长春经济开发区东南湖大路16号,长春,130033 |
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| 基金项目： | 中科院创新课题 (2 0 0 2LQ .0 4 )资助项目 |
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| 摘 要： | 首次导出了圆锥透镜对球面入射波的聚焦衍射计算公式，分析了其轴上能量分布与横向场能量分布特性. 数值计算结果表明，选择合适的球面入射波可以扩展焦深，改善光强分布，同时保证横向场能量分布要求. 对于半径20 mm，锥角θ=1×10－2的圆锥透镜，采用曲率半径为1200~1400 mm的球面入射波，可扩展焦深200 mm到120 mm，光强的均匀性有明显改善，横向场能量分布形状改变量不超过15 μm，完全达到应用要求.
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| 关 键 词： | 衍射 圆锥透镜 无衍射光 稳相位法 |
| 收稿时间： | 2003-11-03 |
| 修稿时间： | 2003年11月3日 |
The Focus Diffraction Property of Axicons Illuminated by Incident Spherical Wave |
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| Institution: | (State Key Lab of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022) |
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| Abstract: | Simple expressions based on the method of stationary-phase are derived for the axis line images produced by acicons illuminated by spherical wave. By using these expressions, the characteristics of its energy flow along axis and the lateral intensity distribution are gotten. The numerical calculations indicate that the on –axis intensity distribution and focal depth range can be developed and the lateral intensity distribution may be ensured by choosing correct spherical wave. For the axicons with 20 mm radius, 10 -2 cone angle, when using incident spherical wave whose radius of curvature varius from 1200 mm to 1400 mm, the focal length increases from 200 mm to 120 mm and the lateral intensity distribution increases only 15μm. |
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| Keywords: | Diffraction Axicons Nondiffracting beams Stationary-phase method |
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