Advances in 3D microscopy by optical scanning holography

Kyu Doh

doi:10.1117/12.2316195

1 September 1996 Advances in 3D microscopy by optical scanning holography

Kyu Doh

Proceedings Volume 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology; 2778E2 (1996) https://doi.org/10.1117/12.2316195
Event: 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 1996, Taejon, Korea, Republic of

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.

Citation Download Citation

Kyu Doh "Advances in 3D microscopy by optical scanning holography", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778E2 (1 September 1996); https://doi.org/10.1117/12.2316195

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