摘要
利用皮秒和飞秒激光研究了激光在空气中聚焦产生单个等离子体通道的条件.研究发现,能量为8—12mJ皮秒激光被焦距为15cm的透镜聚焦后,可以产生较为稳定的单个通道.通过横向纵向阴影成像分析发现,通道的管壁对聚焦产生的自发光具有箍缩作用,而通道内部却有利于光的传输.同时还发现,当采用短焦距透镜时,能量低于10mJ的飞秒激光在空气中较易形成单个等离子通道.
The conditions of generating a single plasma channel in air are studied by using picosecond and femtosecond laser pulse. A stable and single plasma channel can be generated by a picosecond laser pulse with energy of 8-12 mJ and focusing length of 15 cm. The self-generated light emission is observed to be confined in the plasma channel and propagates in the channel. When using short focal length lenses it is easy to generate a single plasma channel in air with femtosecond laser with energy less than 10 mJ.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第12期7114-7119,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60478047
10390161
10675164
60621063
10634020
10574161)
国家重点基础研究发展规划(批准号:2007CB815100)
中国科学院知识创新工程重要方向性项目(批准号:KZCX1-YW-01
KZCX2-YW-T01))资助的课题.~~
关键词
等离子体通道
皮秒激光
飞秒激光
阴影成像
plasma channel, picosecond laser, femosecond laser, shadowgraph imaging