Topic
Optical modulator
About: Optical modulator is a research topic. Over the lifetime, 14068 publications have been published within this topic receiving 196932 citations.
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TL;DR: The operating characteristics of a new class of spatial light modulator that utilize ferroelectric liquid crystals and their application to building optical neural network architectures are discussed.
Abstract: Spatial light modulators can be used in neurocomputing as input and output display devices and storage media for the synaptic weights. We discuss the operating characteristics of a new class of spatial light modulator that utilize ferroelectric liquid crystals and their application to building optical neural network architectures.
67 citations
TL;DR: Generalized optical processing and computing systems are described in order to identify principal categories of requisite components for complete system implementation, with emphasis on the materials requirements imposed by functional constraints.
Abstract: Devices for optical processing and computing systems are discussed, with emphasis on the materials requirements imposed by functional constraints. Generalized optical processing and computing systems are described in order to identify principal categories of requisite components for complete system implementation. Three principal device categories are selected for analysis in some detail: spatial light modulators, volume holographic optical elements, and bistable optical devices. The implications for optical processing and computing systems of the materials requirements identified for these device categories are described, and directions for future research are proposed.
67 citations
TL;DR: A digital micromirror device (DMD)-based optical system that converts a spatially noisy quasi-Gaussian to an eighth-order super-Lorentzian flat-top beam and can be used to generate the homogeneous optical lattice required for Bose-Einstein condensate cold atom experiments.
Abstract: We demonstrate a digital micromirror device (DMD)-based optical system that converts a spatially noisy quasi-Gaussian to an eighth-order super-Lorentzian flat-top beam. We use an error-diffusion algorithm to design the binary pattern for the Texas Instruments DLP device. Following the DMD, a telescope with a pinhole low-pass filters the beam and scales it to the desired sized image. Experimental measurements show a 1% root-mean-square (RMS) flatness over a diameter of 0.28 mm in the center of the flat-top beam and better than 1.5% RMS flatness over its entire 1.43 mm diameter. The power conversion efficiency is 37%. We develop an alignment technique to ensure that the DMD pattern is correctly positioned on the incident beam. An interferometric measurement of the DMD surface flatness shows that phase uniformity is maintained in the output beam. Our approach is highly flexible and is able to produce not only flat-top beams with different parameters, but also any slowly varying target beam shape. It can be used to generate the homogeneous optical lattice required for Bose-Einstein condensate cold atom experiments.
67 citations
TL;DR: An all-optical photoaddressed spatial light modulator has been demonstrated and positive and negative modulation is possible when suitable angles of incidence are chosen for the reading beam.
Abstract: An all-optical photoaddressed spatial light modulator has been demonstrated. The device consists of a prism of high refractive index coated with a thin silver film and a dye-doped polymer film. The writing beam photothermally changes the distribution of the refractive index of the dye-doped film. The reading beam, of a different wavelength, which is incident upon the prism near an angle for surface plasmon resonance at the metal–dye-doped-film interface, undergoes modulation on reflection. Both positive and negative modulation is possible when suitable angles of incidence are chosen for the reading beam. We obtained a resolution of 15 line pairs/mm, an ∼10-s rise time, a 2-s fall time.
67 citations
TL;DR: In this article, the operation of InxGa1−x As/GaAs 50 and 100-period multiple quantum well optical modulators at wavelengths ranging from 1.02 to 1.07 μm was reported.
Abstract: We report the operation of strained‐layer InxGa1−x As/GaAs 50‐ and 100‐period multiple quantum well optical modulators at wavelengths ranging from 1.02 to 1.07 μm. Structures were grown on GaAs substrates, as well as on strain relief InxGa1−xAs buffer layers. Devices show favorable electrical characteristics and absorption contrasts up to 57% at the exciton peak. Optical modulation of a Nd:YAG laser is demonstrated, via operation of self‐electro‐optic effect devices at 1.064 μm.
67 citations