A spectrometer for high-resolution and high-contrast Brillouin spectroscopy in the ultraviolet

Year: 2005

Authors: Benassi P., Eramo R., Giugni A., Nardone M., Sampoli M.

Autors Affiliation: INFM, Università di Roma L’Aquila, and Dipartimento di Fisica, Facoltà di Scienze Via Vetoio, Coppito, 67100 L’Aquila, Italy;
INFM. Università di Roma Firenze, L.E.N.S., and Dipartimento Energetica, Università di Firenze, Via S. Marta 3, 50139 Firenze, Italy

Abstract: We present a multiple-grating spectrometer designed for high-resolution and high-contrast low-frequency scattering spectroscopy in the ultraviolet, as well as in the visible spectral regions. The instrument has a resolution better than 1 GHz and a contrast of about 1×10(-10) both in the visible and in the UV range, thus doubling the highest resolution achieved by double-monochromator double-pass spectrometers such as the SOPRA DMDP2000, conceived for Raman-Brillouin spectroscopy using visible excitation. Performance tests and the Brillouin spectra obtained in the ultraviolet range are reported. Ray tracing results, aiming to give a better insight on the instrument performances are also presented. The instrument opens the possibility to study a new region of the exchanged momentum with a suitable energy resolution and to investigate the spectrum of density fluctuations in materials where the UV penetration depth could be a relevant step for the experimental study of the dynamics of disordered material. (C) 2005 American Institute of Physics.


Volume: 76 (1)      Pages from: 013904  to: 013904

More Information: The realization of HIRESUV was funded by INFM (Isti-tuto Nazionale per la Fisica della Materia) as an “Advanced Research Project.” It would have never been possible without the endeavor of Professor Vittorio Mazzacurati who devoted the last years of his life in obtaining the funding for this project and in initiating its construction thus crowning a scientific career entirely dedicated to high resolution spectroscopy. The authors are indebted to Osvaldo Consorte for fruitful suggestions about the fine tuning of the mechanics; we acknowledge also the accurate mechanical realizations of Francesco Del Grande, Walter Galli, and Paolo Landi.
KeyWords: Brillouin scattering; Ray tracing, Brillouin spectroscopy; Density fluctuation; Disordered materials; Energy resolutions; Highest resolutions; Instrument performance; Low-frequency scattering; Visible spectral regions, Spectrometers
DOI: 10.1063/1.1832173

Citations: 15
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