Topic
Spatial light modulator
About: Spatial light modulator is a research topic. Over the lifetime, 9043 publications have been published within this topic receiving 130143 citations.
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Patent•
23 Dec 1992TL;DR: In this article, a deformable membrane type of spatial light modulator is modified and used with a lens for beam steering applications, where an incoming beam is incident on the membrane and reflected from it.
Abstract: A deformable membrane type of spatial light modulator (10) may be modified and used with a lens (16) for beam steering applications. A reflective membrane (11) is deformed by one or more of a multiplicity of underlying address electrodes (14), such that it has a different center of curvature depending on which electrode is being energized. An incoming beam is incident on the membrane and reflected from it. A lens (16) collimates light reflected from the membrane so that a beam is reflected in a desired direction relative to the incoming beam.
57 citations
TL;DR: In this paper, the authors demonstrate feedback-optimized focusing of spatially coherent polychromatic light after transmission through strongly scattering media, and describe the relationship between optimized focus intensity and initial far-field speckle contrast.
Abstract: We demonstrate feedback-optimized focusing of spatially coherent polychromatic light after transmission through strongly scattering media, and describe the relationship between optimized focus intensity and initial far-field speckle contrast. Optimization is performed using a MEMS spatial light modulator with camera-based or spectrometer-based feedback. We observe that the spectral bandwidth of the optimized focus depends on characteristics of the feedback signal. We interpret this dependence as a modification in the number of independent frequency components, or spectral correlations, transmitted by the sample, and introduce a simple model for polychromatic focus enhancement that is corroborated by experiment with calibrated samples.
57 citations
TL;DR: By analyzing the diffraction efficiency of the DOL and the microstructure of the SLM, this work proposed three important strategies for the proper implementation of DOLs and DOL arrays with a SLM.
Abstract: A traditional Shack-Hartmann wavefront sensor (SHWS) uses a physical microlens array to sample the incoming wavefront into a number of segments and to measure the phase profile over the cross section of a given light beam. We customized a digital SHWS by encoding a spatial light modulator (SLM) with a diffractive optical lens (DOL) pattern to function as a diffractive optical microlens array. This SHWS can offer great flexibility for various applications. Through fast-Fourier-transform (FFT) analysis and experimental investigation, we studied three sampling methods to generate the digitized DOL pattern, and we compared the results. By analyzing the diffraction efficiency of the DOL and the microstructure of the SLM, we proposed three important strategies for the proper implementation of DOLs and DOL arrays with a SLM. Experiments demonstrated that these design rules were necessary and sufficient for generating an efficient DOL and DOL array with a SLM.
57 citations
TL;DR: In this paper, two-photon polymerization was used to increase the numerical aperture of the optical fiber to a value close to 1 by coupling light into the fiber through a spatial light modulator, which was able to optically scan a submicrometer spot (300 nm FWHM) over an extended region.
Abstract: The use of individual multimode optical fibers in endoscopy applications has the potential to provide highly miniaturized and noninvasive probes for microscopy and optical micromanipulation. A few different strategies have been proposed recently, but they all suffer from intrinsically low resolution related to the low numerical aperture of multimode fibers. Here, we show that two-photon polymerization allows for direct fabrication of micro-optics components on the fiber end, resulting in an increase of the numerical aperture to a value that is close to 1. Coupling light into the fiber through a spatial light modulator, we were able to optically scan a submicrometer spot (300 nm FWHM) over an extended region, facing the opposite fiber end. Fluorescence imaging with improved resolution is also demonstrated.
57 citations
Patent•
02 Feb 1994
TL;DR: In this paper, a spectral signature analysis system is proposed for spectral signatures, including a light source, a spatial light modulator connected to the light source and an optic system upon which the modulated light from the spatial modulator is incident.
Abstract: Apparatus for analyzing a spectral signature, including: a light source; a spatial light modulator connected to the light source, the spatial light modulator modulating light from the light source in accordance with spatial features of the spectral signature; an optic system upon which modulated light from the spatial light modulator is incident, the optic system filtering the modulated light; a hologram illuminated with filtered, modulated light from the optic system, the hologram outputting an optical identification of the spectral signature; and a detector upon which the optical identification is incident, the detector detecting the optical identification.
56 citations