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超短脉冲激光在光波导阵列中传输产生的非线性折射率通常会导致功率的局域化,而逐渐形成孤子,本文通过耦合模理论模拟发现,功率局域化的主要条件依赖于波导折射率差,当波导折射率差较小时,随着非线性折射率的增加会出现反局域化的现象。进一步分析发现,波导阵列初始折射率差、非线性折射率差和最大耦合常数对应的饱和折射率差之间的关系决定了局域化和反局域化过程。用高重复频率飞秒激光光刻波导技术制作了波导阵列,注入低重复频率的飞秒激光,引入非线性折射率,观察到局域化和反局域化过程。
The nonlinear refractive index of ultrashort pulse laser propagating in optical waveguide array usually leads to the localization of power and the gradual formation of solitons. The simulation of coupled mode theory shows that the main condition of power localization depends on the refractive index of waveguide Poor, when the waveguide refractive index difference is small, with the increase of nonlinear refractive index will appear anti-localization phenomenon. Further analysis shows that the relationship between the initial refractive index difference, the nonlinear refractive index difference and the saturation refractive index difference corresponding to the maximum coupling constant of the waveguide array determines the localization and the anti-localization process. Waveguide arrays were fabricated using high-repetition-rate femtosecond laser photolithography waveguide technology. The femtosecond laser with low repetition frequency was implanted. The nonlinear refractive index was introduced and the localization and anti-localization were observed.