SCHULTE, A.; GUO, Yu; SCHIRMACHER, W.; UNRUH, T.; CARDINAL, Thierry

doi:10.1016/j.vibspec.2007.12.014

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SCHULTE, A.
Department of Physics
The College of Optics and Photonics [Orlando] [CREOL]

GUO, Yu
Department of Physics
The College of Optics and Photonics [Orlando] [CREOL]

SCHIRMACHER, W.
Physikdepartment E13

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Vibrational Spectroscopy. 2008, vol. 48, n° 1, p. 12-15

Elsevier

Résumé en anglais

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.< Réduire

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Raman spectroscopy

Boson peak

Raman gain

Neutron scattering

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

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