Digital holographic microscope with a wide field of view

Sanghoon Shin; Minchul Park; Il ki Han; Jung-Young Son

doi:10.1117/12.630262

15 November 2005 Digital holographic microscope with a wide field of view

Sanghoon Shin, Minchul Park, Il ki Han, Jung-Young Son

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.

Citation Download Citation

Sanghoon Shin, Minchul Park, Il ki Han, and 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); https://doi.org/10.1117/12.630262

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