厄米—高斯光束的聚焦场特性
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摘要: 借助广义惠更斯–菲涅尔衍射积分(即Collins公式)推导出Hermite–Gaussian光束(H-G光束)在无光阑限制下的相对焦移和相对光强增量的解析表达式,并作了分析。对有光阑限制下的H–G光束的聚焦场特性做了详细的数值计算和讨论。Abstract: Closed – form expressions for the relative intensity excess and focal shift of Hermite – Gaussian beams focused by an unaperture lens have been derived and analyzed by means of the generalized Huygens – Fresnel diffraction integral (or called collins formula). For the apertured case we have performed detailed numerical calculations, showing the focusing field characteristics of Hermite – Gaussion beams.
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Key words:
- hermite – gaussian (h – g) beam /
- focusing field /
- focal shift /
- aperture
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