Soft Report - Dipartimento di Fisica - Sapienza
Soft Report - Dipartimento di Fisica - Sapienza
Soft Report - Dipartimento di Fisica - Sapienza
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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 <strong>di</strong>ffraction. Frequencyresolvedlight scattering (Sopra monochromator) anddynamic light scattering. New <strong>di</strong>electric 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 <strong>di</strong>fferent scatteringangles with both visible and ultraviolet ra<strong>di</strong>ation. 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 of<strong>di</strong>sorder induced high frequency attenuation.19SOFT Scientific <strong>Report</strong> 2004-06