Millisecond Brillouin Scattering Spectroscopy

摘要

The millisecond Brillouin spectroscopy was developed and applied for the real-time observation of phonons in solid and gas materials. The Brillouin spectra of solid (polymethylmethacrylate) and gas (air) at 300 K are observed over the wave number range from k=8.1 × 10~4 m~(-1) to k=5.3 × 10~5 m~(-1). The measurement time is only 100 ms, which is by far shorter than that for the conventional method from several minutes to several hours. The technique would provide us with a useful tool for the dynamic observation of thermal phonons in solid and gas.