Abstract

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. 关键词: 等离子体通道 / 皮秒激光 / 飞秒激光 / 阴影成像 Abstract 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—12mJ and focusing length of 15cm. 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 10mJ. Keywords: plasma channel / picosecond laser / femosecond laser / shadowgraph imaging 作者及机构信息 仲佳勇, 李玉同, 鲁 欣, 张 翼, Bernhardt Jens, 刘 峰, 郝作强, 张 喆, 于全芝, 陈 民, 远晓辉, 梁文锡, 赵 刚, 张 杰 基金项目: 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)和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. Authors and contacts 参考文献 施引文献

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