Using an ultraslow light-based double-Λ-type configuration we demonstrate atomic coherence swing between two different frequencies in a nondegenerate four-wave mixing scheme. A short control pulse applied to the middle of an ultraslow light envelope results in coherence conversion between two ground states, causing both coherence depletion and recovery, resulting in a temporal hole and amplification in the ultraslow light envelope. This outcome holds potential for temporally and spatially localized coherence control of ultraslow light in such applications as a selective photon trap.
© 2009 Optical Society of America
Original Manuscript: December 3, 2008
Revised Manuscript: January 30, 2009
Manuscript Accepted: February 1, 2009
Published: March 9, 2009
Byoung S. Ham and Joonsung Hahn, "Atomic coherence swing in a double-Λ-type system using ultraslow light," Opt. Lett. 34, 776-778 (2009)