Slow light and superluminality in Kerr media without a pump.
Subluminal and superluminal propagation of a light pulse in Kerr materials has been investigated. Group velocities as slow as much less than 1 mm per second to as fast as negative several thousands meters per second can easily be obtained in the Kerr medium, which possesses a large nonlinear refractive index and long relaxation time, such as Cr3+-doped alexandrite, ruby, and GdAlO3. The physical mechanism is the strong highly dispersive coupling between different frequency components of the pulse.
Yang
Qiguang
Q
Department of Physics, Hampton University, Hampton, Virginia 23668, USA. qiguang.yang@hamptonu.edu
Seo
Jae Tae
JT
Tabibi
Bagher
B
Wang
Huitian
H