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.

A spectrometer for high-resolution and high-contrast Brillouin spectroscopy in the ultraviolet / P. Benassi, R. Eramo, A. Giugni, M. Nardone, M. Sampoli. - In: REVIEW OF SCIENTIFIC INSTRUMENTS. - ISSN 0034-6748. - 76:1(2005), pp. 013904.1-013904.7. [10.1063/1.1832173]

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

A. Giugni;
2005

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.
Settore FIS/03 - Fisica della Materia
20-dic-2004
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/826128
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