Soft Report - Dipartimento di Fisica - Sapienza

Optical Laboratory - UdR Firenze/LENSLaser facility for femto and pico-second time-resolvednon-linear spectroscopy. Raman scattering, Infraredabsorption. High pressure (Diamond Anvil Cells andcorrelated equipment). X ray diffraction. Frequencyresolvedlight scattering (Sopra monochromator) anddynamic light scattering. New dielectric spectroscopictechnique, in the range 30 MHz – 3 GHz, characterized byabsolute measurements.Laser system at LENS facilityUV Light Scattering Laboratory - UdR L’AquilaHIRESUV: A High Resolution, high contrast spectrometerfor UV Brillouin SpectroscopyHIRESUV is a multiple grating spectrometer designed for highresolutionand high-contrast scattering spectroscopy in theultraviolet as well as il the visible spectral regions. Theinstrument has been set up in the Physics Department of L’Aquilaand is now available for measurement at different scatteringangles with both visible and ultraviolet radiation. The obtainedperformancies are an intrumental resolution better than 1 GHzand a contrast of about 3x10 -12 both in the visible and in the UVrange. For further details see P. Benassi et al., Review ofScientific Instruments 76, 13904 (2005).The echelle gratings used have a ruled area ofabout 200x400 mm 2 with 31.6 grooves/mm andare blazed for an incidence angle of about 75 o .Experiments performed with HIRESUV up to now essentiallyconcern with:i) UV and visible Brillouin spectroscopy of glass formingliquids in the study of relaxation processes and transversedynamicsL TT Lii) UV and visible spectroscopy of glasses in the study ofdisorder induced high frequency attenuation.19SOFT Scientific Report 2004-06