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Partial spatial coherence effects in digital holographic microscopy with a laser source

机译:使用激光源的数字全息显微镜中的部分空间相干效应

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We investigate a digital holographic microscope that permits us to modify the spatial coherence state of the sample illumination by changing the spot size of a laser beam on a rotating ground glass. Out-of-focus planes are refocused by digital holographic reconstruction with numerical implementation of the Kirchhoff-Fresnel integral. The partial coherence nature of the illumination reduces the coherent artifact noise with respect to fully coherent illumination. The investigated configuration allows the spatial coherence state to be changed without modifying the illumination level of the sample. The effect of the coherence state on the digital holographic reconstruction is theoretically and experimentally evaluated. We also show how multiple reflection interferences are limited by the use of reduced spatial coherent illumination.
机译:我们研究了一种数字全息显微镜,该显微镜允许我们通过更改旋转毛玻璃上激光束的光斑大小来修改样品照明的空间相干状态。焦平面通过数字全息重建重新聚焦,并采用Kirchhoff-Fresnel积分的数值实现。照明的部分相干特性相对于完全相干照明降低了相干伪影噪声。所研究的配置允许在不改变样品照明度的情况下改变空间相干状态。理论上和实验上评估了相干态对数字全息重建的影响。我们还展示了如何通过减少空间相干照明来限制多重反射干扰。

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