15 November 2005 Digital holographic microscope with a wide field of view
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Proceedings Volume 6016, Three-Dimensional TV, Video, and Display IV; 60160W (2005) https://doi.org/10.1117/12.630262
Event: Optics East 2005, 2005, Boston, MA, United States
Abstract
We present a digital holographic microscope that has a wide field of view. Off-axis holograms are recorded with a magnified image of microscopic objects and numerically reconstructed by calculation of scalar diffraction in the Fresnel approximation. Holograms are recorded by CCD. The distance between neighbouring pixels of a CCD is only of the order of 5 micrometer. The corresponding maximum resolvable frequency is of the order of 100 linepairs /mm. The maximum angle between the reference and object wave is therefore limited to a few degrees. The higher magnification by an objective lens with the higher power makes the wider angle object beam. Off- axis holograms with the high power objective lens has the limitation of magnification and a field of view. We present a new type of imaging system that overcomes the limitation of magnification and a field of view. It is consisted of an objective lens and additional lens array. It makes the nearly same angle between object beams and a reference beam. The overlapped angles are also less than the maximum limited angle due to CCD pixel size. It also has a maximum field of view which is decided inherently by an objective lens. It therefore overcomes the limitation of the size of CCD.
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Sanghoon Shin, Sanghoon Shin, Minchul Park, Minchul Park, Il ki Han, Il ki Han, Jung-Young Son, Jung-Young Son, } "Digital holographic microscope with a wide field of view", Proc. SPIE 6016, Three-Dimensional TV, Video, and Display IV, 60160W (15 November 2005); doi: 10.1117/12.630262; https://doi.org/10.1117/12.630262
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