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The angular spectrum method(ASM) is a popular numerical approach for scalar diffraction calculations. However,traditional ASM has an inherent problem in that nonuniform sampling is precluded. In an attempt to address this limitation,an improved trigonometric interpolation ASM(TIASM) is proposed, in which the fast Fourier transform(FFT) is replaced by a trigonometric interpolation. The results show that TIASM is more suitable to situations in which the source field has a simple and strong frequency contrast, irrespective of whether the original phase distribution is a plane wave or a Fresnel zone plate phase distribution. 相似文献
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在激光系统中,镜面平整度很大程度上影响了输出激光的光束质量。为了定量地评价镜面瑕疵对激光光束质量的影响程度,提出描述镜面瑕疵与空间光束相关程度的参数τ和镜面瑕疵对远端光场的影响参数δ。经仿真计算,研究了不同镜面瑕疵对激光光束质量的影响程度,得出影响参数δ和相关度τ的变化规律,即影响参数δ和相关度τ的内在线性关系。对于任意TEM00模、TEM01模和TEM02模,此线性关系近似一致,具有普遍性。例如当瑕疵透过率为0时,对于3种模式的光场,δ随τ变化的线性曲线的斜率都近似等于1.8。 相似文献
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