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Validity of the Fresnel approximation for hard-edged diffracted beams
Author(s): 
Pages: 670-672
Year: Issue:  6
Journal: LASER TECHNOLOGY

Keyword:  基尔霍夫衍射菲涅耳衍射硬边光阑高斯光束;
Abstract: 使用基尔霍夫衍射积分公式和菲涅耳衍射积分公式对高斯光束通过方孔光阑的衍射进行了研究.给出了详细的数值计算结果并作了比较.研究表明,对一给定的束腰宽度w0,当w0远大于波长λ时,菲涅耳衍射的有效范围与截断参数δ有关;若w0与λ可比拟甚至更小时,则必须使用基尔霍夫衍射积分公式.
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