| 复费涅耳数的物理意义及其应用 |
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| 引用本文： | 王绍民,江晓清,林强. 复费涅耳数的物理意义及其应用[J]. 中国激光, 2000, 27(2): 140-144 |
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| 作者姓名： | 王绍民 江晓清 林强 |
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| 作者单位： | 浙江大学物理系!杭州310028 |
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| 摘 要： | 通过对高斯光束经光阑衍射后轴上点光强分布规律的分析,详细讨论了复费涅耳数的物理意义及其应用,指出采用位相片,可将远场轴上光强提高为原高斯光束的几倍以上,而且中央光斑也比高斯光束小,并给出在激光准直中应用的例子。
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| 关 键 词： | 复费涅耳数 衍射 光阑 位相片 |
| 收稿时间： | 1998-09-22 |
Physical Meaning and Applications of Complex Fresnel Number |
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| Wang Shaomin Jiang Xiaoqing Lin Qiang. Physical Meaning and Applications of Complex Fresnel Number[J]. Chinese Journal of Lasers, 2000, 27(2): 140-144 |
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| Authors: | Wang Shaomin Jiang Xiaoqing Lin Qiang |
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| Abstract: | The physical meaning of complex Fresnel number is discussed in detail based on the axial intensity of Gaussian beam diffracted by a hard aperture. The far field intensity on axis can be enhanced by several times of the original Gaussian beam using a suitable phase aperture. In the meantime, the central spot is smaller than the original Gaussian beam. An application example of laser collimation is given. |
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| Keywords: | complex Fresnel number diffraction aperture phase plate |
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