Kang Dongyel, Milster Tom D
College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA.
J Opt Soc Am A Opt Image Sci Vis. 2009 Dec;26(12):2577-85. doi: 10.1364/JOSAA.26.002577.
Optical aberration effects on Gaussian speckle contrast are theoretically examined in an imaging system exhibiting partial spatial coherence. Analysis includes phase-perturbed random fields from a rough object illuminated by an extended source that generate speckle in the image plane. Results indicate that, unlike coherent illumination, speckle contrast in this partially coherent system depends on odd-functional aberrations, such as coma. In addition, calculations show that speckle contrast reduction as a function of coherence factor exhibits a stronger dependence on aberrations than for an aberration-free case.
在一个呈现部分空间相干性的成像系统中，从理论上研究了光学像差对高斯散斑对比度的影响。分析包括由扩展光源照明的粗糙物体产生的相位受扰随机场，这些随机场在像平面中产生散斑。结果表明，与相干照明不同，在这个部分相干系统中，散斑对比度取决于诸如彗差等奇次函数像差。此外，计算表明，作为相干因子函数的散斑对比度降低，相比于无像差情况，对像差表现出更强的依赖性。
