Abstract
We have developed a new light scattering method for acoustic phonon spectroscopy utilizing optical generation of phonons. A scanning interference pattern by two intersecting laser beams having slightly different frequencies generates in a light-absorbing sample the corresponding density variation. When the phase velocity of an interference pattern matches the phonon velocity, phonons are resonantly generated and its resonance spectrum gives us information equivalent to spontaneous Brillouin spectrum. The marked feature of our method is to use two continuous-wave frequency-tunable lasers as the light sources, which enables us to construct very-high-resolution and wide-band phonon spectroscopy.
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