激光与光电子学进展, 2012, 49 (8): 081901, 网络出版: 2012-06-19
多色控制下的非线性光学效应
Multicolor Manipulation of Nonlinear Optical Effects
非线性光学 多色控制 色散转换 布居反转 Kerr非线性增强 nonlinear optics multicolor manipulation dispersion switching population inversion enhancement of Kerr nonlinearity
摘要
分析了三能级Λ原子系统内三色操控引起的色散转换、Kerr非线性增强效应及三色操控对布居反转的影响。分析表明,三色调控下多个双光子通道之间的干涉将引起多个透明窗口内的Kerr非线性增强和布居反转频带增宽。而三色场内两边频场的相对相位之和对色散变换、布居反转和Kerr非线性增强效应也起着至关重要的影响。相位之和从0调为π,将引起多个频带内色散正负转换,从而使得慢光速向超光速转换,引起Kerr非线性增强对应的频带位置改变,并引起布居反转对应的频带进一步增宽。相位之和影响以上非线性效应的原因也得到了分析。
Abstract
Trichromatic manipulation of dispersion switching, enhancement of Kerr nonlinearity and population inversion are analyzed in a three-level Λ atomic system. It is shown that, due to the interference among multiple two-photon channels, the Kerr nonlinearity is enhanced in multiple transparent windows and the frequency band corresponding to population inversion becomes wider. On the other hand, the sum of the relative phases of the sideband components of the trichromatic field plays a crucial role in the response of the medium. As the sum phase is adjusted from 0 to π, dispersion is switched from normal to anomalous in multiple frequency regimes, which corresponds to the switching from subluminal to superluminal light propagation. With the sum phase changing from 0 to π, the Kerr nonlinearity is enhanced in other different frequency regimes, and the frequency band of population inversion is further widened. The influence mechanism of the sum phase is also analyzed.
郭洪菊, 王春芳, 龚尚庆. 多色控制下的非线性光学效应[J]. 激光与光电子学进展, 2012, 49(8): 081901. Guo Hongju, Wang Chunfang, Gong Shangqing. Multicolor Manipulation of Nonlinear Optical Effects[J]. Laser & Optoelectronics Progress, 2012, 49(8): 081901.