Abstract

We demonstrate a strong coherent backward wave oscillation using forward propagating fields only. This is achieved by applying laser fields to an ultra-dispersive medium with proper chosen detunings and an appropriate spatial phase to excite a molecular vibrational coherence that corresponds to a backward propagating wave. This leads to new possibilities of controling phase-matching direction as well as having phase-matching simultaneously in forward and backward directions. It has applications to generation of entangled photon state.

© 2006 Optical Society of America