Abstract
We have proposed an optical information processing technique by synthesis of the coherence function. It has been demonstrated theoretically and experimentally that the coherence functions of special shapes, for example, delta-function-like or a notch, can be synthesized by modulating the frequency of a laser diode in an interferometer with appropriate waveform [1],[2]. This technique can realize optical information processing functions such as selective extraction or masking of 2-D information from a 3-D object at an arbitrary depth tunable by the frequency modulation parameter, with the advantages of full optical processing, no electronic calculation and no mechanical moving parts [3],[4]. In our previous systems, holography was used to detect selectively the interference component proportional to the coherence function. Using the manner of holography, however, resulted in a tilt between the reference wave and the object wave, which formed an intrinsical limitation to the spatial resolution of the system. To overcome the problem, a synchronous detection system using 2-D lock-in amplifier with microchannel-plate spatial light modulator (MSLM) is proposed in this presentation. Basic experimental results for selective extraction of 2-D images from a 3-D object are reported.
© 1996 Optical Society of America
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