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Brillouin Spectrometer A laser beam is focused on the sample by an optical system. The scattered light can be acquired at 180° with respect to the incident beam (backscatering) or at 90°. Sampel holder permits to precisely vary the incidence angle. Brillouin spectrometer is a Sandercock tandem multi-pass Fabry-Perot with a contrats of about 1000000. This permits to separate peaks with a frequency shift (with respect to the vidible laser light) in the 1-300 GHz range. The spectrum is acquired with a photomultiplier in single photo counting. Brillouin measurements in vacuum and in the 80-800 K temperature range can be performed by a Oxford Instruments cryostat.Excitation Laser: Argon Ion (Coherent Innova 300): 514.5 nm, 488 nm
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 Micro and Nanostructured Materials Lab, Department of Energy Politecnico di Milano Via Ponzio 34/3 I-20133 Milan, Italy |
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