Kramers-Kronig Relations and high order nonlinear susceptibilities
Kramers-Kronig Relations and high order nonlinear susceptibilities
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Kramers-Kronig 关系和高阶非线性磁化率
DOI：
10.1103/physreva.85.033806
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发表时间：
2012
影响因子：
2.9
通讯作者：
Günter Steinmeyer
中科院分区：
文献类型：
--
作者：
Carsten Brée;Ayhan Demircan;Günter Steinmeyer
正如之前的理论结果最近揭示的那样，多光子吸收率的 Kramers-Kronig 变换可以精确预测近红外非线性折射率的色散。结果表明，该方法可以重现关于高阶克尔效应重要性的最新实验结果。扩展这些结果，当前的手稿提供了所有惰性气体的色散，与参考数据非常一致。进一步确定非线性折射率的饱和度和反转随波长高度色散，这表明存在不同的丝化状态。虽然较短的激光波长有利于成熟的等离子体钳位机制，但高阶克尔效应 (HOKE) 的影响在长波长机制中占主导地位。
As previous theoretical results recently revealed, a Kramers-Kronig transform of multiphoton absorption rates allows for a precise prediction on the dispersion of the nonlinear refractive indexin the near infrared. It was shown that this method allows reproduction of recent experimental results on the importance of the higher-order Kerr effect. Extending these results, the current manuscript provides the dispersion offor all noble gases in excellent agreement with reference data. It is furthermore established that the saturation and inversion of the nonlinear refractive index is highly dispersive with wavelength, which indicates the existence of different filamentation regimes. While shorter laser wavelengths favor the well-established plasma clamping regime, the influence of the higher-order Kerr effect (HOKE) dominates in the long-wavelength regime.