title: Nonlinear propagation of ultraslow pulses in media with electromagnetically induced transparency.
abstract: The nonlinear behavior of a probe pulse propagating in a medium with electromagnetically induced transparency is studied both numerically and analytically. A new type of nonlinear wave equation is proposed in which the noninstantaneous response of nonlinear polarization is treated properly. The resulting nonlinear behavior of the propagating probe pulse is shown to be fundamentally different from that predicted by the simple nonlinear Schrödinger-like wave equation that considers only instantaneous Kerr nonlinearity.
authors.affiliation: Key Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China. chengjing@siom.ac.cn
authors.forename: Jing
authors.initials: J
authors.lastname: Cheng
authors.forename: Shensheng
authors.initials: S
authors.lastname: Han
authors.forename: YiJing
authors.initials: Y
authors.lastname: Yan