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Proceedings Paper

Selective image extraction by synthesis of the coherence function using two-dimensional optical lock-in amplifier with microchannel spatial light modulator
Author(s): Zuyuan He; Toru Okugawa; Naohisa Mukohzaka; Kazuo Hotate
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Paper Abstract

A novel optical information processing system by synthesis of the coherence function is proposed. By modulating the frequency of a laser diode in an interferometer with appropriate waveform, the system synthesizes the coherence function into a delta-function-like peak at a depth tunable by the frequency modulation parameter, and thus can extract 2D images from 3D object at arbitrary depth in the form of interference component. To detect selectively the interference component, a 2D optical lock-in amplifier with the microchannel spatial light modulator is developed, so that the limitation to the depth resolution introduced by the holographic detection which was used in our previous systems is overcome, Selective image extraction is demonstrated successfully with neither mechanical scanning nor digital calculation.

Paper Details

Date Published: 3 October 1996
PDF: 8 pages
Proc. SPIE 2899, Automated Optical Inspection for Industry, (3 October 1996); doi: 10.1117/12.252998
Show Author Affiliations
Zuyuan He, Univ. of Tokyo (Japan)
Toru Okugawa, Univ. of Tokyo (Japan)
Naohisa Mukohzaka, Hamamatsu Photonics KK (Japan)
Kazuo Hotate, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 2899:
Automated Optical Inspection for Industry
Frederick Y. Wu; Shenghua Ye, Editor(s)

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