We propose a new method of resonant enhancement of optical Kerr nonlinearity that uses multilevel atomic coherence. The enhancement is accompanied by suppression of the other linear and nonlinear susceptibility terms of the medium. We show that the effect results in a modification of the nonlinear Faraday rotation of light propagating in an <sup>87</sup>Rb vapor cell by changing the ellipticity of the light.
© 2003 Optical Society of America
(020.1670) Atomic and molecular physics : Coherent optical effects
(020.7490) Atomic and molecular physics : Zeeman effect
(190.4180) Nonlinear optics : Multiphoton processes
(270.0270) Quantum optics : Quantum optics
(270.4180) Quantum optics : Multiphoton processes
A. B. Matsko, I. Novikova, G. R. Welch, and M. S. Zubairy, "Enhancement of Kerr nonlinearity by multiphoton coherence," Opt. Lett. 28, 96-98 (2003)