Abstract
We report on the observation of a Raman frequency conversion mechanism different from the usual Stokes (anti-Stokes) stimulated process. A continuous down-shift of laser pulse frequency was measured for sufficiently short pulses propagating in gaseous . We attribute this behavior to the extremely nonstationary nuclear response of molecules to the light field with a duration shorter than the period of the Raman-active vibration.
- Received 16 April 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.1215
©1998 American Physical Society