实验研究了飞秒激光干涉条纹在CS2介质中传输的增长率与条纹间隔以及增长率与中心峰值强度的关系。结果发现, 在非线性介质中传输的1维干涉调制特别是当其调制频率位于中心光强对应的最快增长频率附近时, 随着传输距离的增加调制场迅速获得增长, 将高斯光束分裂成多根峰值强度很高的带状细丝。相应的数值模拟与实验结果具有较好的一致性。

The nonlinear Propagation instabilities lead to the growth of interference fringes is experimentally investigated, by using a femtosecond pluse laser . We report measurements of the growth rate for fringes in a glass cuvette is filled with CS2 as a function of fringe spacing and intensity. And we observed the ripples grow rapidly when the modulated beam propagation in the nonlinear media, especially when the spatial frequency which is just near the fast growing frequency. Numerical show good agreement with the experimental results.