Low-frequency vibrational excitations in a niobium-phosphate glass for Raman gain applications

Schulte A, Guo Y, Schirmacher W, Unruh T, Cardinal T (2008)

Publication Status: Published

Publication Type: Journal article

Publication year: 2008

Journal

Vibrational Spectroscopy Elsevier

Publisher: ELSEVIER SCIENCE BV

Book Volume: 48

Pages Range: 12-15

Journal Issue: 1

DOI: 10.1016/j.vibspec.2007.12.014

Abstract

Raman gain for all-optical amplification depends significantly on the cross section for spontaneous Raman scattering. We present measurements of the Raman spectrum of binary niobium-phosphate glasses in the frequency range from 5 to 1300 cm(-1). The spectra of these glasses show a low-frequency enhancement of the vibrational density of states ('Boson peak') suggesting a significant gain profile for application in Raman amplifiers as well as providing an additional mechanism for Raman gain. To separate the effects of density of states from the light-vibration coupling we carried out an inelastic neutron scattering investigation of 40Nb(2)O(5)-60NaPO(3) using the time-of-flight spectrometer (TOFrOF) at the FRM II neutron source in Munich. The Boson peak appears between 40 and 70 cm(-1) as an increase of the reduced density of states over the flat Debye approximation. Possible mechanisms contributing to the low-frequency excitations such as disorder-induced irregular vibrational states are discussed. (C) 2008 Elsevier B.V. All rights reserved.

Authors with CRIS profile

Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden)

Involved external institutions

University of Central Florida (UCF) US United States (USA) (US) Technische Universität München (TUM) DE Germany (DE)

How to cite

APA:

Schulte, A., Guo, Y., Schirmacher, W., Unruh, T., & Cardinal, T. (2008). Low-frequency vibrational excitations in a niobium-phosphate glass for Raman gain applications. Vibrational Spectroscopy, 48(1), 12-15. https://doi.org/10.1016/j.vibspec.2007.12.014

MLA:

Schulte, Alfons, et al. "Low-frequency vibrational excitations in a niobium-phosphate glass for Raman gain applications." Vibrational Spectroscopy 48.1 (2008): 12-15.

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