Fedotov Il'ya V, Fedotov Andrei B, Zheltikov Aleksei M
Physics Department, International Laser Center, M. V. Lomonosov Moscow State University, Vorob'evy gory, Moscow, Russia.
Opt Lett. 2006 Sep 1;31(17):2604-6. doi: 10.1364/ol.31.002604.
Coherent anti-Stokes Raman scattering (CARS) is used to measure relations between the resonant (Raman) and nonresonant (Kerr-type) optical nonlinearities of air-guided modes in a hollow-core photonic-crystal fiber (PCF). We demonstrate that, due to its interference nature, CARS provides a convenient tool for measuring the contribution of the fiber cladding to the total nonlinearity sensed by air-guided modes in hollow PCFs. On a Raman resonance with molecular vibrations in the gas that fills the fiber core, a two-color laser field is shown to induce optical nonlinearities that are several orders of magnitude higher than the nonresonant Kerr-type nonlinearities typical of air-guided PCF modes.
相干反斯托克斯拉曼散射（CARS）用于测量中空光子晶体光纤（PCF）中空气引导模式的共振（拉曼）和非共振（克尔型）光学非线性之间的关系。我们证明，由于其干涉性质，CARS为测量光纤包层对中空PCF中空气引导模式所感知的总非线性的贡献提供了一种便捷工具。在与填充光纤芯的气体中的分子振动发生拉曼共振时，双色激光场被证明会诱导出比空气引导PCF模式典型的非共振克尔型非线性高几个数量级的光学非线性。
