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You searched for: From crystallography to visible light
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    From crystallography to visible light [History]

    Brusso, B.C.
    Industry Applications Magazine, IEEE

    Volume: 14 , Issue: 4
    DOI: 10.1109/MIAS.2008.923620
    Publication Year: 2008 , Page(s): 8 - 10

    IEEE Journals & Magazines

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    A New Sensor for Thermal Neutron Imaging

    Shestakova, I. ; Tipnis, S.V. ; Gaysinskiy, Valeriy ; Antal, J.J. ; Bobek, L. ; Nagarkar, V.V.
    Nuclear Science, IEEE Transactions on

    Volume: 52 , Issue: 4
    DOI: 10.1109/TNS.2005.852671
    Publication Year: 2005 , Page(s): 1109 - 1113
    Cited by:  Papers (1)  |  Patents (6)

    IEEE Journals & Magazines

    Thermal neutrons serve as a useful tool in probing macromolecular structures in protein crystallography and in investigations of new materials. However, neutron techniques are underutilized due to the lack of high performance digital, position sensitive detectors. The primary limiting factor in current detectors is the converter screen which converts the neutron signal into visible light. Here we report on a new type of neutron sensitive screen for use in digital imaging systems. The screen consists of a pixelated, microstructured CsI(Tl) scintillator film sandwiched between two neutron converting layers of$hbox GdF_3$. To increase the effective surface area of the$hbox GdF_3$conversion layer and to enhance the contrast resolution of the images, the CsI(Tl) layer is pixelated using micromachining techniques. For testing their imaging performance, the sensors were optically coupled to a CCD system to form an imaging detector. The system was subjected to imaging tests at a thermal neutron port of the University of Massachusetts Lowell Research Reactor. The results of these preliminary imaging experiments are presented here. View full abstract»

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    A new sensor for thermal neutron imaging

    Shestakova, I. ; Tipnis, S.V. ; Gaysinskiy, Valeriy ; Antal, J.J. ; Bobek, L. ; Nagarkar, V.V.
    Nuclear Science Symposium Conference Record, 2004 IEEE

    Volume: 1
    DOI: 10.1109/NSSMIC.2004.1462192
    Publication Year: 2004 , Page(s): 254 - 258 Vol. 1

    IEEE Conference Publications

    Thermal neutrons serve as a useful tool in probing macromolecular structures in protein crystallography and in investigations of new materials. However, neutron techniques are underutilized due to the lack of high performance digital, position sensitive detectors. The primary limiting factor in current detectors is the converter screen which converts the neutron signal into visible light. Here we report on a new type of neutron sensitive screen for use in digital imaging systems. The screen consists of a pixelated, microstructured CsI(Tl) scintillator film sandwiched between two neutron converting layers of GdF3. To increase the effective surface area of the GdF3 conversion layer and to enhance the contrast resolution of the images, the CsI(Tl) layer is pixelated using micromachining techniques. For testing their imaging performance, the sensors were optically coupled to a CCD system to form an imaging detector. The system was subjected to imaging tests at a thermal neutron port of the University of Massachusetts Lowell Research Reactor. The results of these preliminary imaging experiments are presented here. View full abstract»

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    Nonlinear optical properties of K2La(NO3)5.2H2O and K2 Ce(NO3)5.2H2O

    Ebbers, Christopher A. ; DeLoach, L.D. ; Webb, M. ; Eimerl, D. ; Velsko, Stephan P. ; Keszler, Douglas A.
    Quantum Electronics, IEEE Journal of

    Volume: 29 , Issue: 2
    DOI: 10.1109/3.199304
    Publication Year: 1993 , Page(s): 497 - 507
    Cited by:  Patents (2)

    IEEE Journals & Magazines

    The harmonic generating properties of potassium lanthanum nitrate (KLN) and potassium cerium nitrate (KCN) are described. These crystals have much larger nonlinear coefficients than potassium dihydrogen phosphate (KDP) and are nearly noncritically phase matched at room temperature for Type I frequency doubling of 1.064-μm light, and for Type II doubling of light near 0.95 μm. Thus, these crystals are useful for generating blue-green light by frequency doubling high-power near-infrared lasers. The crystal growth of KLN and KCN are described by the three component phase diagrams. Crystallographic data for KCN that confirms its structural similarity to KLN are presented. The optical absorption spectra of the two materials are discussed, and the linear refractive indexes are given View full abstract»

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    Growth and nonlinear optical studies of single-crystal thin films of 4-aminobenzophenone (ABP)

    Bhowmik, A.K. ; Wang, J. ; Thakur, M.
    Lasers and Electro-Optics, 1998. CLEO 98. Technical Digest. Summaries of papers presented at the Conference on

    DOI: 10.1109/CLEO.1998.676063
    Publication Year: 1998

    IEEE Conference Publications

    Summary form only given. Single-crystal thin films of 4-aminobenzophenone (ABP) having large area and excellent optical quality surface have been prepared by a modification of the shear method. The area and thickness of the films were 1 cm/sup 2/ and 4 /spl mu/m, respectively. Polarized optical microscopic studies confirmed the single-crystal nature of the films. The crystallographic plane and the molecular orientation on the substrate were determined by X-ray diffraction technique. The surface orientation of the film was found to be [100]. The charge transfer axis lies close to parallel to the surface of the film. The optical absorption spectra, measured by visible spectroscopy, revealed a large window of transparency extending down to 390 nm, making it suitable for blue light generation. View full abstract»

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    Crystal Structure, UV-vis Absorption and Fluorescent Properties of a Novel Coumarin Derivative

    Peng Zhang ; Tianzhi Yu ; Yuling Zhao ; Fan, Duowang
    Nano-Optoelectronics Workshop, 2007. i-NOW '07. International

    DOI: 10.1109/INOW.2007.4303004
    Publication Year: 2007 , Page(s): 306 - 307

    IEEE Conference Publications

    A novel 3-(1H-4-methyl-benzotriazol-1-yl)-4-methyl-benzo[7,8]coumarin(MBMBC) containing an electron-transporting moiety (benzotriazole) was characterized single crystal X-ray crystallography and UV-vis absorption spectra. The compound exhibits strong blue emission and may prove to be important class of OLED material. View full abstract»

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