Journal ArticleDOI
Parallel image subtraction using a phase-conjugate Michelson interferometer.
Arthur E. Chiou,Pochi Yeh +1 more
TLDR
A phase-conjugate Michelson interferometer using an internally self-pumped barium titanate crystal as reflectors has been constructed to perform parallel image subtraction, intensity inversion, and exclusive or logic operation.Abstract:
A phase-conjugate Michelson interferometer using an internally self-pumped barium titanate crystal as reflectors has been constructed to perform parallel image subtraction, intensity inversion, and exclusive or logic operation. These operations are independent of the optical path differences and phase aberration.read more
Citations
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Journal ArticleDOI
Photorefractive properties of strontium‐barium niobate
TL;DR: In this paper, the authors measured the coupling of two optical beams in strontium-barium niobate crystals and determined the photorefractive properties: the effective density, sign, and spectral response of the dominant charge carrier, the grating formation rate, dark conductivity, and carrier diffusion length.
Journal ArticleDOI
Multilayer Optical Learning Networks
Kelvin H. Wagner,Demetri Psaltis +1 more
TL;DR: A new approach to learning in a multilayer optical neural network based on holographically interconnected nonlinear devices that performs an approximate implementation of the backpropagation learning procedure in a massively parallel high-speed nonlinear optical network.
Journal ArticleDOI
Applications of photorefractive crystals
TL;DR: In this paper, the authors present different suggestions for applications of photorefractive crystals and SLMs for holographic interferometry and 2D image processing, based on various phase-conjugate geometries.
Journal ArticleDOI
Information synthesis (complex amplitude addition and subtraction) and encryption with digital holography and virtual optics
TL;DR: The encryption method proposed is based on extended fractional Fourier transforms and is performed in all-digital manner and the synthesized data reconstructed numerically also can be stored and transmitted in the conventional communication channel.
Journal ArticleDOI
Applications of photorefractive materials in information storage, processing and communication
TL;DR: In this paper, the authors describe several applications of various photorefractive materials in information storage, processing, and communication systems, including photopolymers, holographic polymer dispersed liquid crystals, and photosensitive glasses.
References
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Journal ArticleDOI
Self-pumped, continuous-wave phase conjugator using internal reflection
TL;DR: Continuous-wave phase conjugation of an image-bearing beam is demonstrated using a single-domain crystal of BaTiO(3) and nothing else and has a phase-conjugate reflectivity of 30%.
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Coherent oscillation by self‐induced gratings in the photorefractive crystal BaTiO3
TL;DR: In this article, the authors report the demonstration of several new optical oscillator configurations including a unidirectional ring oscillator and a self-pumped phase conjugate mirror.
Journal ArticleDOI
Optical image synthesis (complex amplitude addition and subtraction) by hollographic fourier transformation
Journal ArticleDOI
Passive (self-pumped) phase conjugate mirror: Theoretical and experimental investigation
TL;DR: In this article, a phase conjugate mirror based on real-time holography in materials which allow a spatial phase shift between the refractive index grating and the light interference pattern was investigated.
Journal ArticleDOI
Optical Image Subtraction
TL;DR: There are several methods for optically subtracting one image from another in order to detect differences between scenes or between photographs of scenes as discussed by the authors, including holographic, interferometric, coding, and positive-negative superposition methods.