Complete wavefront reconstruction using sequential intensity measurements of a volume speckle field
Complete wavefront reconstruction using sequential intensity measurements of a volume speckle field
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DOI：
10.1364/ao.45.008596
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发表时间：
2006-12-01
期刊：
影响因子：
1.9
通讯作者：
Osten, Wolfgang
中科院分区：
文献类型：
--
作者：
Almoro, Percival;Pedrini, Giancarlo;Osten, Wolfgang
在不同平面处记录来自对象的体积散斑场与波传播方程相结合允许在不需要参考波的情况下重建波前相位和振幅。这种单光束多强度重建（SBMIR）技术的主要优点是简单的实验装置，因为不需要参考波的情况下，全息。将相位恢复技术应用于漫反射和漫透射物体的研究。通过仿真和实验研究了不同参数对重建质量的影响。当强度测量的数量为15或更多并且连续测量距离为0.5mm或更大时，观察到重建的显著增强。在重建过程期间使用计算的相位执行两次迭代也导致更好的重建。计算机模拟的结果证实了实验。分析了SBMIR技术中体散斑场的横向和纵向光强分布。通过在横向方向上将相机移动半像素的距离来增强分辨率的方法改善了散斑图案的采样，并导致更好的质量重建。这允许记录来自较大测试对象的波场的可能性。(c)2006年美国光学学会。
The recording of the volume speckle field from an object at different planes combined with the wave propagation equation allows the reconstruction of the wavefront phase and amplitude without requiring a reference wave. The main advantage of this single-beam multiple-intensity reconstruction (SBMIR) technique is the simple experimental setup because no reference wave is required as in the case of holography. The phase retrieval technique is applied to the investigation of diffusely transmitting and reflecting objects. The effects of different parameters on the quality of reconstructions are investigated by simulation and experiment. Significant enhancements of the reconstructions are observed when the number of intensity measurements is 15 or more and the sequential measurement distance is 0.5 mm or larger. Performing two iterations during the reconstruction process using the calculated phase also leads to better reconstruction. The results from computer simulations confirm the experiments. Analysis of transverse and longitudinal intensity distributions of a volume speckle field for the SBMIR technique is presented. Enhancing the resolution method by shifting the camera a distance of a half-pixel in the lateral direction improves the sampling of speckle patterns and leads to better quality reconstructions. This allows the possibility of recording wave fields from larger test objects. (c) 2006 Optical Society of America.