Abstract
Coherent phonons in tellurium were first observed by Cheng et al. in 19901 and a displacive excitation mechanism (DECP) was proposed.1,2 In DECP, a laser pulse shorter than the phonon period instantaneously weakens the bonds and coherent oscillations ensue about newly established equilibrium lattice positions. Accordingly, only symmetry-preserving phonon modes can be excited via this mechanism.
© 2002 Optical Society of America
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