【摘要】 对太瓦（TW）飞秒激光在自然大气中传输时产生的超长等离子体通道的物理性质进行了研究。试验结果证实2 TW飞秒激光在大气中自由传输时实现了2km长的等离子体通道,长距离传输后通道内的等离子体电子密度约为10¹¹ cm^-3,仍然保持良好的导电性。高压放电试验也证实了有等离子体通道存在,可以将放电电压降低30%,说明激光诱导高压放电的有效性。本次试验研究表明长度为公里量级、长寿命大气等离子体通道的实现是可行的,将为激光引雷、大气监测、人工干预气候等实用化应用扫清技术上的障碍。更多还原

【Abstract】 The properties of long plasma-channel generated by terawatt（TW） femtosecond laser propagating in natural environmental air are investigated.It shows that the plasma filamentation with length of2 km can be achieved when 2 TW femtosecond laser propagates in natural environment,and the electron density is measured to be 10¹¹ cm^-3 at different location of filament,which shows the good conductivity of plasma channel even at the end of channel.Moreover,high voltage discharge test also confirms that,compared with the case without plasma channel,the high voltage of discharging can be reduced by30% when plasma channel exists,which indicates the effectiveness of fs laser induced discharging.This work paves away for generation of several kilometer and long lifetime filamentation in air,laser induced lightning,environmental monitoring,and artificial intervention of climate.更多还原