Chemnitz Mario, Schmidt Markus A
Opt Express. 2016 Jul 11;24(14):16191-205. doi: 10.1364/OE.24.016191.
Optical fibers with sub-wavelength cores are promising systems for efficient nonlinear light generation. Here we reveal that the single-mode criterion represents a convenient design tool to optimize the performance of nonlinear fibers circumventing intense numerical calculations. We introduce a quasi-analytic expression for the nonlinear coefficient allowing us to investigate its behavior over a large parameter range. The study is independent of the actual value of the material nonlinearity and shows the fundamental dependencies of the nonlinear coefficient on wavelength, refractive index and core diameter, elucidated by detailed case studies of fused silica and chalcogenide tapers and hybrid fibers.
具有亚波长纤芯的光纤是实现高效非线性光产生的有前景的系统。在此我们揭示，单模准则是一种便捷的设计工具，可用于优化非线性光纤的性能，避免进行复杂的数值计算。我们引入了一个非线性系数的准解析表达式，使我们能够在较大参数范围内研究其行为。该研究与材料非线性的实际值无关，并通过对熔融石英、硫系玻璃锥形光纤和混合光纤的详细案例研究，阐明了非线性系数对波长、折射率和纤芯直径的基本依赖性。
