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Proceedings Paper

Advances in 3D microscopy by optical scanning holography
Author(s): Kyu Doh
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Paper Abstract

Optical scanning holography (OSH) is a technique in which 3-D information of an object can be recorded by 2-D scanning [see reference]. The technique involves optical scanning the 3-D object by a so-called time-dependent Fresnel zone plate (TDFZP). The TDFZP is created by the superposition of a plane wave and a spherical wave of different temporal frequencies. When the object is optically scanned, a photodetector collects the scattered light and delivers a heterodyne current as output. The current is then mixed down to become a demodulated signal. When the demodulated signal is synchronized with the x and y scans of the x-y optical scanning system and fed to a 2-D display, what is displayed in 2-D is a hologram or a Fresnel zone plate coded information of the object being scanned. To decode the information optically in real time, the holographic inforthation could be transferred to a spatial light modulator (SLM) for coherent reconstruction. Digital reconstruction is also possible by convolving the hologram with a free-space impulse response. Whereas the work of optical scanning holography has been concentrated on on-axis techniques which inherently produce twin-image upon reconstruction (or decoding), in this paper we introduce a novel technique in which the twin-image can be eliminated in the context of optical scanning holography.

Paper Details

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778E2 (1 September 1996); doi: 10.1117/12.2316195
Show Author Affiliations
Kyu Doh, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)

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