Abstract

It was earlier found that a sudden frequency change during a Franck-Condon transition leads to phonon squeezing.¹ We show that phonon squeezing connected to the finiteness of the excitation pulse duration is a quite common effect in ultrashort laser pulse experiments, leading to drastic changes in the transient spectrum. We also investigate how the chirp and incoherence of the exciting pulse² influence the resulting phonon state.

© 1990 Optical Society of America