We demonstrate electromagnetically induced transparency in a four-level cascade system where the upper level is a Rydberg state. The observed spectral features are sub-Doppler and can be enhanced due to the compensation of Doppler shifts with AC Stark shifts. A theoretical description of the system is developed that agrees well with the experimental results, and an expression for the optimum parameters is derived.
© 2012 Optical Society of America
Atomic and Molecular Physics
Original Manuscript: June 27, 2012
Manuscript Accepted: August 1, 2012
Published: September 13, 2012
Christopher Carr, Monsit Tanasittikosol, Armen Sargsyan, David Sarkisyan, Charles S. Adams, and Kevin J. Weatherill, "Three-photon electromagnetically induced transparency using Rydberg states," Opt. Lett. 37, 3858-3860 (2012)