Inelastic neutron and low-frequency Raman scattering in a niobium-phosphate glass for Raman gain applications

    Authors

    T. Unruh; A. Schulte; Y. Guo; W. Schirmacher;B. Schmid

    Comments

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    Abbreviated Journal Title

    J. Non-Cryst. Solids

    Keywords

    Raman scattering; Neutron scattering; Raman gain; Boson peak; BOSON PEAK; VIBRATIONAL EXCITATIONS; COUPLING COEFFICIENT; LIGHT-SCATTERING; VITREOUS SILICA; STATES; DENSITY; DEPENDENCE; DYNAMICS; DISORDER; Materials Science, Ceramics; Materials Science, Multidisciplinary

    Abstract

    We present measurements of the vibrational spectrum of a binary niobium-phosphate glass in the THz frequency range using inelastic neutron and Raman scattering. The spectra of these glasses show a low-frequency enhancement of the vibrational density of states ("boson peak"). Using a recently developed theory of vibrational excitations in disordered solids we are able to reconcile the measured neutron and Raman spectra using fluctuating elastic and Pockels constants as a model concept. As the spontaneous Raman susceptibility is a key parameter for Raman amplification our results suggest a significant gain profile for application of niobium-phosphate glasses in Raman amplifiers. (C) 2010 Elsevier B.V. All rights reserved.

    Journal Title

    Journal of Non-Crystalline Solids

    Volume

    357

    Issue/Number

    2

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    506

    Last Page

    509

    WOS Identifier

    WOS:000287640800047

    ISSN

    0022-3093

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