Leventoux Y, Granger G, Krupa K, Tonello A, Millot G, Ferraro M, Mangini F, Zitelli M, Wabnitz S, Février S, Couderc V
Opt Lett. 2021 Jan 1;46(1):66-69. doi: 10.1364/OL.411868.
Characterization of the complex spatiotemporal dynamics of optical beam propagation in nonlinear multimode fibers requires the development of advanced measurement methods, capable of capturing the real-time evolution of beam images. We present a new space-time mapping technique, permitting the direct detection, with picosecond temporal resolution, of the intensity from repetitive laser pulses over a grid of spatial samples from a magnified image of the output beam. By using this time-resolved mapping, we provide, to the best of our knowledge, the first unambiguous experimental observation of instantaneous intrapulse nonlinear coupling processes among the modes of a graded index fiber.
表征非线性多模光纤中光束传播的复杂时空动力学需要开发先进的测量方法，这些方法能够捕捉光束图像的实时演变。我们提出了一种新的时空映射技术，它能够以皮秒级的时间分辨率，直接检测来自输出光束放大图像的空间样本网格上重复激光脉冲的强度。据我们所知，通过使用这种时间分辨映射，我们首次对渐变折射率光纤模式间的瞬时脉冲内非线性耦合过程进行了明确的实验观测。
