【摘要】 对不同啁啾状态下的飞秒激光在大气中的成丝过程进行了研究.实验研究发现成丝状况及其演化与初始激光脉冲的啁啾状态密切相关,适当的负啁啾有利于激光的成丝传输.当初始激光脉冲的啁啾量不断变大时,激光脉冲在大气中的成丝起点位置会逐渐变远.还研究了初始脉冲啁啾量对使用聚焦透镜产生的细丝的影响,发现其与自由传输情况具有相似的变化规律.更多还原

【Abstract】 Effect of the laser chirp on the laser filamentation is investigated.It is found that the chirp plays a crucial role in the formation of filamentation and its evolution.An initial negative chirp is favorable for long-distance propagation of filaments in air.As the chirp increases,the distance between the compressor and the position of the onset of filaments becomes larger.We also investigate the influence of initial chirp on the focusing laser pulses by a lens.It is found that there are the same tendency of filaments formed by lens and those in free propagation.更多还原