Title

Low-Frequency Vibrational Excitations In A Niobium-Phosphate Glass For Raman Gain Applications

Keywords

Boson peak; Neutron scattering; Raman gain; Raman spectroscopy

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 40Nb2O5-60NaPO3 using the time-of-flight spectrometer (TOFTOF) 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. © 2008 Elsevier B.V. All rights reserved.

Publication Date

9-18-2008

Publication Title

Vibrational Spectroscopy

Volume

48

Issue

1

Number of Pages

12-15

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.vibspec.2007.12.014

Socpus ID

49049108699 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/49049108699

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