Time-domain soft mode spectroscopy

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Abstract
The application of impulsive stimulated light scattering, an entirely time-domain form of light scattering spectroscopy, to the study of lattice dynamics in crystals near structural phase transitions is reviewed. Advantages of the time-domain approach are demonstrated for study of low-frequency, heavily damped, and/or dispersive modes such as soft acoustic phonons. Impulsive stimulated Brillouin and Raman scattering data showing time-dependent oscillations and decay of acoustic and optic phonons, respectively, are presented and explained. Results of experiments on acoustic phonons in uniaxial and incommensurate ferroelectrics are summarized. Time-domain spectrosocopy of soft optic phonons and other overdamped modes is discussed.