飞秒脉冲激光1维强度调制的传输特性
Propagation of femtosecond laser pulse with one-dimensional intensity modulation
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摘要: 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。Abstract: The growth of interference fringes caused by nonlinear propagation instabilities has been experimentally investigated using a femtosecond pulsed laser. This paper reports the measurements of growth rate for fringes in a glass cuvette filled with CS2 as a function of fringe spacing and intensity. The ripples grow rapidly when the modulated beam propagates in the nonlinear media, and there exists a modulation frequency where the intensity modulation grows fastest and filamentation happens. Numerical results show good agreement with the experimental results．
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Key words:
- self-focusing /
- femtosecond laser /
- filamentation /
- modulation instability
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