| 部分相干光在双焦聚焦系统中的焦移和焦开关 |
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| 引用本文： | 刘晓云,蒲继雄.部分相干光在双焦聚焦系统中的焦移和焦开关[J].华侨大学学报(自然科学版),2006,27(2):137-140. |
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| 作者姓名： | 刘晓云 蒲继雄 |
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| 作者单位： | 华侨大学信息科学与工程学院,福建,泉州,362021 |
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| 基金项目： | 国家自然科学基金资助项目(60477041)
福建省自然科学基金资助项目(A0510018)
国务院侨务办公室科研基金资助项目(03QZR4) |
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| 摘 要： | 应用惠更斯-菲涅耳衍射积分公式,研究部分相干光被由菲涅耳波片组成的双聚焦系统聚焦后的焦移现象．研究结果表明,焦移量不仅依赖于聚焦系统的菲涅耳数,而且依赖于入射部分相干光的空间相干度．对于某一固定的菲涅耳波片,降低空间相干度,会导致发生焦开关的临界菲涅耳数降低,但当空间相干度太低时,焦开关现象会消失．
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| 关 键 词： | 部分相干光 焦移 焦开关 菲涅耳波片 衍射 |
| 文章编号： | 1000-5013（2006）02-0137-04 |
| 收稿时间： | 2005-11-09 |
| 修稿时间： | 2005-11-09 |
Focal Shift and Focal Switch of Partially Coherent Light in Dual Focus Systems |
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| Liu Xiaoyun,Pu Jixiong.Focal Shift and Focal Switch of Partially Coherent Light in Dual Focus Systems[J].Journal of Huaqiao University(Natural Science),2006,27(2):137-140. |
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| Authors: | Liu Xiaoyun Pu Jixiong |
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| Institution: | College of Information Science and Engineering, Huaqiao University, 362021, Quanzhou, China |
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| Abstract: | Applying the Huygens-Fresnel diffractive integral, we investigate the phenomenon of the focal shifts when a partially coherent light focused by a dual focus system that is consisted of a Fresnel zone plate. The theoretical results show that the amount of the focal shifts is not only dependent upon the Fresnel number of the focusing system, but also on the spatial coherence of the incident partially coherent light. For a fixed Fresnel zone plate, the decrease of the spatial coherence results in the decrease of the critical Fresnel number at which a focal switch occurs, And, when the spatial coherence is too low, the phenomenon of a focal switch disappears. |
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| Keywords: | partially coherent light focal shift focal switch Fresnel zone plate diffraction |
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