A scheme for giant enhancement of the Kerr nonlinearity in a four-level system with double dark resonances is proposed. Compared with that generated in a single-dark-resonance system, the Kerr nonlinearity can be enhanced by several orders of magnitude with vanishing linear absorption. We attribute this dramatic enhancement to the interaction of dark resonances.
© 2005 Optical Society of America
Yueping Niu, Shangqing Gong, Ruxin Li, Zhizhan Xu, and Xiaoyan Liang, "Giant Kerr nonlinearity induced by interacting dark resonances," Opt. Lett. 30, 3371-3373 (2005)