使用荧光探测和声学诊断两种方法,对超强飞秒激光脉冲在空气中传输形成的等离子体通道同时进行了测量.两种方法都很好地反映了等离子体通道的演化过程.对两种方法的比较研究发现,声学诊断相对于荧光探测方法来说,具有较高的灵敏度和空间分辨能力,实验装置也更简单,更适宜于等离子体通道的常规测量.
A plasma channel up to 80 Rayleigh lengths is formed when intense femtosecond laser pulses methods, fluorescence measurement and acoustic diagnostics, are used to probe the plasma channel propagate in air. Two simultaneously. Both methods reveal the evolution of the channel in detail. Compared with the fluorescence measurement, the acoustic method is a convenient approach having higher sensitivity and higher spatial resolution in detecting long plasma channels.