Abstract
Generation of coherent optic phonons through impulsive stimulated Raman scattering (ISRS) can occur whenever a sufficiently short optical pulse passes through a Raman-active medium.1-3 In this paper we report the application of specially shaped femtosecond pulse trains to achieve improved control over coherent vibrational motion. In particular, we demonstrate multiple-pulse ISRS, in which terahertz- rate trains of femtosecond pulses are used for repetitive impulsive excitation of optic phonons. By matching the pulse repetition rate to a particular phonon frequency, we are able to select and amplify individual vibrational modes.4 Each successive pulse in the sequence arrives at the sample in phase to amplify the coherent vibrational motion, analogous to repetitively pushing a child on a swing.
© 1991 Optical Society of America
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