Tolliver J, Kolesik M
Opt Express. 2018 Nov 12;26(23):30172-30182. doi: 10.1364/OE.26.030172.
The optical Kerr effect, and the nonlinear polarization in general, represents an important light-matter interaction governing many regimes encountered in the nonlinear optics. We reason that in the context of optical filamentation one should distinguish the third-order Kerr effect occurring at relatively low light intensities from the effective Kerr nonlinearity relevant to higher intensity. While many properties of filaments can be captured well with a third-order nonlinear polarization model with a nonlinear index chosen somewhat higher than the true nonlinear index operative at low intensities, our comparative simulations indicate that some filamentation aspects carry significant signatures from the higher-order nonlinearity.
光学克尔效应，以及一般的非线性极化，代表了一种重要的光与物质相互作用，它支配着非线性光学中遇到的许多情况。我们认为，在光丝形成的背景下，应该区分在相对低光强下发生的三阶克尔效应和与更高光强相关的有效克尔非线性。虽然用一个三阶非线性极化模型可以很好地捕捉光丝的许多特性，该模型的非线性折射率选择略高于在低光强下起作用的真实非线性折射率，但我们的比较模拟表明，光丝形成的某些方面带有高阶非线性的显著特征。
