Abstract

Ultrafast nonlinearities in condensed matter can be studied using many different techniques. Among those techniques, the exploitation of optical beats ranging from the picosecond to the attosecond regime has been described.^1,2 The mechanism responsible for the beat generation can differ for each studied process. Furthermore, information about the medium can be obtained in such experiments,¹ or the observation of the optical beat can be of interest due to the generating mechanism.²

© 1990 Optical Society of America