Experimental and numerical study of the nonlinear response of optical multilayers.
Experimental and numerical study of the nonlinear response of optical multilayers.
复制标题
光学多层膜非线性响应的实验和数值研究。
DOI：
10.1364/oe.25.012675
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发表时间：
2017
期刊：
影响因子：
3.8
通讯作者：
V. Pervak
中科院分区：
文献类型：
--
作者：
T. Amotchkina;M. Trubetskov;V. Pervak
介电多层膜表现出陡峭的反射率在一个非常狭窄的过渡区，高度敏感的层折射率的任何变化，因此适合于研究非线性特性的生产和表征。随着光强的增加，反射率的增加揭示了光学克尔效应的存在。提出了一种计算多层光学薄膜与强激光脉冲非线性相互作用时光谱特性的新方法。该方法是基于一个边界值问题的数值解来自系统的麦克斯韦方程描述的光通过多层系统的传播。该方法为合成具有可预测非线性特性的光学薄膜开辟了一条途径。我们的数值模拟与实验数据的比较，使我们能够准确地确定广泛使用的薄膜材料Ta2O5和Nb2O5的克尔系数n2。
Dielectric multilayer coatings exhibiting steep reflectance in an extremely narrow transition zone, highly sensitive to any variations of layer refractive indices and therefore suitable for studying the nonlinear properties are produced and characterized. Increase of reflectance at growing intensity reveals the presence of the optical Kerr effect. A new method calculating intensity dependent spectral characteristics of multilayer optical coatings in the case of nonlinear interaction with high intensity laser pulses is developed. The method is based on the numerical solution of a boundary-value problem derived from the system of Maxwell equations describing the propagation of light through a multilayer system. The method opens a way to synthesis of optical coatings with predictable nonlinear properties. Comparison of our numerical modelling with experimental data enabled us to accurately determine the Kerr coefficients n2 of the widely-used thin-film materials Ta2O5 and Nb2O5.