飞秒激光成丝过程中由等离子体光栅引起的超连续谱增强与转移  

Supercontinuum enhancement and transfer induced by a plasma grating in air

作　　者：张宗昕[1] 许荣杰[1] 宋立伟[1] 王丁[1] 刘鹏[1] 冷雨欣[1] 

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800

出　　处：《物理学报》2012年第18期194-198,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10734080;60921004;60908008;61078037;11134010;60978012);国家重点基础研究发展计划(批准号:2011CB808101);国际科技合作计划(批准号:2011DFA11300)资助的课题~~

摘　　要：在飞秒宽带激光脉冲成丝过程中,由于双光束干涉效应而形成的空间等离子体光栅,研究了空气中飞秒宽带激光脉冲成丝所产生的超连续谱增强效应,并进一步观测到泵浦光脉冲成丝产生的超连续谱能量向较弱的未成丝的探测光脉冲转移,有效拓展探测光脉冲带宽的新现象.通过基于布拉格衍射特性的理论计算较好地解释了实验结果.We experimentally investigate the plasma grating created by two intersecting ultrashort laser pulses, and its effects on the supercontinuum generated from femtosecond laser filamentation. The enhanced supercontinuum generation is observed, with a plasma grating formed. And an energy transfer of the supercontinuum is demonstrated, from one pulse to the other, due to the diffraction property of plasma grating. The theoretical calculation accords well with the experimental result.

关 键 词：激光成丝 超连续谱 等离子体光栅 布拉格衍射 

分 类 号：TN24[电子电信—物理电子学]