Traditional pinhole spherical wave digital in-line holography has proved to be powerful imaging tools. Image quality is affected by uncertain round of pinhole. Here, we propose a well-distributed sphere wave generation method and it demonstrates wide field of view and high resolution microscopy. The laser focuses into an infinitesimal spot through laser beam expander and microscope objective. Pinhole permutation with different sizes is utilized to match the focal point, and emerges an ideal spherical wave. Interference fringes pattern, formed by reference sphere wave and scattered sphere wave of object, is collected by large area image sensor. The influence of dirty in image sensor and parasitic light is eliminated through subtraction with and without object. Fresnel inverse transformation reconstruction algorithm presents the object information. Biology microscopy experiments demonstrate that the proposed techniques increase the flexibility in producing well-distributed point light source and improve the image quality. Field of view is 3.22 mm×3.22 mm and resolution is 5.09 μm. Furthermore, adjustable field of view with magnification, fast, no-contact make it to be a promising tool in optical element measurement, material identification, biology and medicine.
Biology microscopy using well-distributed sphere digital in-line holography
First published at:Jan 01, 2019
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Supported by Department of Science and Technology of Sichuan Province (2015JQ0009) and the National Natural Science Foundation of China (61705232)
Get Citation: Tian Peng, Yan Wei, Li Fanxing, et al. Biology microscopy using well-distributed sphere digital in-line holography[J]. Opto-Electronic Engineering, 2019, 46(1): 180110.
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