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  • INSTRUMENTATION AND PHOTOGRAPHY  (7)
  • Electronic structure and strongly correlated systems  (3)
  • 1
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    Crystal structure, lattice vibrations, and superconductivity of LaO_{1−x}F_{x}BiS_{2} (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-25
    Description: Author(s): J. Lee, M. B. Stone, A. Huq, T. Yildirim, G. Ehlers, Y. Mizuguchi, O. Miura, Y. Takano, K. Deguchi, S. Demura, and S.-H. Lee Neutron scattering measurements have been performed on polycrystalline samples of the newly discovered layered superconductor LaO 0.5 F 0.5 BiS 2 and its nonsuperconducting parent compound LaOBiS 2 . The crystal structures and vibrational modes have been examined. Bragg peaks from the superconducting sampl... [Phys. Rev. B 87, 205134] Published Fri May 24, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Abrupt change in the energy gap of superconducting Ba_{1-x}K_{x}Fe_{2}As_{2} single crystals with hole doping (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-11
    Description: Author(s): W. Malaeb, T. Shimojima, Y. Ishida, K. Okazaki, Y. Ota, K. Ohgushi, K. Kihou, T. Saito, C. H. Lee, S. Ishida, M. Nakajima, S. Uchida, H. Fukazawa, Y. Kohori, A. Iyo, H. Eisaki, C.-T. Chen, S. Watanabe, H. Ikeda, and S. Shin We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba 1- x K x Fe 2 As 2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ... [Phys. Rev. B 86, 165117] Published Wed Oct 10, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Collective excitations in the metallic triangular antiferromagnet PdCrO2 (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-07-19
    Description: Author(s): A. Glamazda, W.-J. Lee, S.-H. Do, K.-Y. Choi, P. Lemmens, J. van Tol, J. Jeong, and H.-J. Noh We report a combined Raman-scattering and electron spin resonance (ESR) study of the metallic triangular compound PdCrO2 along with lattice dynamic calculations. Our Raman data reveal (i) an exponential increase of the 706 cm−1 Ag mode involving the out-of-plane motions of the oxygen atoms and (ii) ... [Phys. Rev. B 90, 045122] Published Fri Jul 18, 2014
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Mathematical operations by optical processing (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Some recent developments in coherent optical processing are described in this paper. Specifically, the use of one or more elementary gratings to perform useful processing operations and computer-generated spatial filters to obtain generalized transforms are discussed. Applications incorporating nonlinear optical elements and optical feedback into the processing system are also presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering; 13; May-June
    Format: text
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  • 5
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    Restoration of degraded images by composite gratings in a coherent optical processor. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A study has been made on restoration of degraded images utilizing spatial filtering techniques in a coherent optical processor. This study differs from other coherent approaches in that the spatial filters employed contain only composite gratings that are quite simple to produce. A general method of synthesizing the appropriate composite gratings for linearly smeared as well as multiply exposed and out-of-focus images will be presented in some detail with experimental results. The extension of the method of synthesis to other types of degradation is briefly discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 12; July 197
    Format: text
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  • 6
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    Single step detection of blurred images in a coherent optical processor. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Two important operations that can be performed by coherent optical processing systems are image detection and image restoration. These operations require complex spatial filters, and if both operations are to be performed, cascaded processing stages employing two separate spatial filters are usually needed. Spatial filters are described that will perform in a single step both operations simultaneously, thus eliminating the need for extra processing stages while providing the advantages of higher efficiency and smaller space requirements. The filters are characterized by their simplicity and are easily fabricated using conventional techniques. Experimental results are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 12; July 197
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  • 7
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    A coherent optical feedback system for optical information processing (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A unique optical feedback system for coherent optical data processing is described. With the introduction of feedback, the well-known transfer function for feedback systems is obtained in two dimensions. Operational details of the optical feedback system are given. Experimental results of system applications in image restoration, contrast control and analog computation are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Physics; 8; Sept
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  • 8
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    Nonlinear optical processing with Fabry-Perot interferometers containing phase recording media (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: New techniques in nonlinear optical processing are explored, based on the operation of intensity level selection as performed by a Fabry-Perot interferometer containing a phase object. The image being processed is recorded on a medium between the mirrors as a spatially varying phase shift less than pi. The interferometer only transmits light through those portions of the object that corresponds to a single value of the phase and hence to a single intensity level in the input. More complicated operations such as thresholding and analog-to-digital conversion are performed by modulating the light source as the different levels are selected. Photoresist and lithium niobate have been used as phase objects, and experimental data for both are presented. Three kinds of Fabry-Perot interferometers have been used to demonstrate nonlinear processing using coherent and incoherent light. Color images have been produced with black and white inputs and white light illumination.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 9
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    The application of an optical Fourier spectrum analyzer on detecting defects in mass-produced satellite photographs (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Various defects in mass-produced pictures transmitted to earth from a satellite are investigated. It is found that the following defects are readily detectable via Fourier spectrum analysis: (1) bit slip, (2) breakup causing loss of image, and (3) disabled track at the top of the imagery. The scratches made on the film during mass production, which are difficult to detect by visual observation, also show themselves readily in Fourier spectrum analysis. A relation is established between the number of scratches, their width and depth and the intensity of their Fourier spectra. Other defects that are found to be equally suitable for Fourier spectrum analysis or visual (image analysis) detection are synchronous loss without blurring of image, and density variation in gray scale. However, the Fourier spectrum analysis is found to be unsuitable for detection of such defects as pin holes, annotation error, synchronous loss with blurring of images, and missing image in the beginning of the work order. The design of an automated, real time system, which will reject defective films, is treated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-148198
    Format: application/pdf
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  • 10
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    Optimal coherent image amplification by two-wave coupling in photorefractive BaTiO3 (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Coherent image amplification by two-wave coupling in a crystal of photorefractive BaTiO3 is analyzed. This amplifier is optimized with respect to such operational characteristics as gain versus amplified image quality and space-bandwidth product. Experimental results that demonstrate coherent image amplification of 4000, space-bandwidth product of 1,000,000, and gray-level dynamic range of greater than 100 are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Optical Engineering (ISSN 0091-3286); 25; 228-234
    Format: text
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