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采用具有不同初始负啁啾量的飞秒激光脉冲,研究了其在ZK7玻璃中非线性成丝传输的物理特性.实验表明激光成丝的阈值功率随着脉冲初始啁啾量的增大而升高,但啁啾导致的光学细丝长度将逐渐变长.通过光丝超连续谱的测量与分析,发现了啁啾激光成丝过程中等离子体的非线性作用随着初始啁啾量的增大而减弱,并在较长空间距离内形成了非电离特性占主导的光学成丝的新现象.另外,实验观察到了啁啾脉冲激光成丝过程中的多光丝干涉图像,理论分析和讨论了非电离光学成丝的物理机制.这些研究结果表明初始啁啾量对于超短激光脉冲成丝过程将起到至关重要的作用.
The femtosecond laser pulses with different initial negative chirp amounts were used to study the physical properties of the nonlinear filaments in ZK7 glass. The experimental results show that the threshold power of the laser filaments increases with the increase of the initial pulse chirp High, but the length of the optical filament caused by the chirp will gradually become longer.According to the measurement and analysis of the supercontinuum of the optical fiber, it is found that the nonlinear effect of the plasma during the chirped laser silk spinning increases with the increase of the initial chirp Large and weak, and formed a new phenomenon of non-ionizing characteristic dominated optical filaments in a longer spatial distance.In addition, experimental observations of the multi-filamentary interference images in the process of chirped pulsed laser filamentation, theoretical analysis and discussion The physical mechanism of non-ionized optical filaments shows that the initial amount of chirp plays a crucial role in the ultrashort laser pulsing.