Abstract
A practical stimulated Brillouin-scattering method for spectroscopic characterization of low-frequency excitations is extended to permit optical generation and detection of phase-coherent transverse, longitudinal, and mixed polarization acoustic phonons, tunable over a wide frequency range, in solid media. Results are presented for BK-7 glass and the KH 2PO 4 crystal near its structural phase transition (SPT). Time-domain observations of acoustic phonon-induced ordering near SPTs in KH 2PO 4 and KD 2PO 4 were carried out, and applications of the technique to measurements of SPT dynamics are discussed.
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