Abstract
The pulse velocity in the linear regime in samples of GaP: N with a laser tuned to the bound -exciton line is measured with use of a picosecond time-of-flight technique. The pulse is seen to propagate through the material with little pulse-shape distortion, and with an envelope velocity given by the group velocity even when the group velocity exceeds 3× cm/sec, , or becomes negative. The results verify the predictions of Garrett and McCumber.
- Received 30 November 1981
DOI:https://doi.org/10.1103/PhysRevLett.48.738
©1982 American Physical Society