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07/11/14 Seminario Dr. F. Scarponi
Venerdì 07 Novembre 2014 ore 12:00
Sala Riunioni CNR (IV piano Via Pascoli)
Dr. Filippo Scarponi (JRS Scientific Instruments, CH)
JRS TFP1 and TFP2-HC tandem Fabry-Perot interferometers
A Fabry-Perot interferometer is based on the principle of multiple beam interference. When used as a spectrometer the plane-parallel Fabry-Perot has excellent resolution but a rather low free spectral range and also a low contrast which does not allow measurements of spectra with high intensity differences. In order to overcome this latter limitation, it has been used corner-cube prisms to route the beam several times through different areas of the Fabry-Perot mirrors, thereby attaining a contrast of more than 1011. For recording Brillouin spectra of opaque samples, the very high-intensity elastic peak has to be separated from the rather low intensity Brillouin peaks. To overcome the restriction of the low free spectral range, a piezoelectrically scanned tandem multipass Fabry-Perot was designed. Attaching a confocal microscope to the tandem multipass Fabry-Perot interferometer, the recording of Brillouin back-scattering spectra with about 1 micrometre spatial resolution is achieved. With the aid of a computer controlled x-y table, Brillouin spectra imaging of solid samples is also possible. The software for controlling the x-y table is included in the software for recording the Brillouin spectra.
Tutti gli interessati sono invitati a partecipare.
Dr.s S. Corezzi & S. Caponi

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