Abstract
The polarization created in a material by intense ultrashort optical pulses contains a wealth of information on the nature and dynamics of the elementary excitations the material can sustain. Recently a considerable effort has been made to understand the amplitude decay of this polarization in many solids by measuring the amplitude of the optical field it radiates.1 The full description of a light pulse, however, must give its amplitude as well as its phase, and to date little attention has been paid to measuring the temporal evolution of the phase. Phase measurements are of particular interest in systems in which the induced dipoles arc strongly coupled either between themselves or to an external heat bath. For
© 1993 Optical Society of America
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