超短强激光作用下空气的三次谐波辐射  

Third Harmonic Generation in Air Through Interaction with Ultrashort Intense Laser Pulses

作　　者：钟方川[1] 胡雪原[1] 邓健[1] 王益民[1] 江云华[1] 王文跃[1] 张正泉[1] 李儒新[1] 徐至展[1] 

机构地区：[1]中国科学院上海光学精密机械研究所强光光学开放研究实验室,上海201800

出　　处：《光学学报》2002年第1期10-13,共4页Acta Optica Sinica

基　　金：国家高技术 86 3 410资助课题

摘　　要：进行了飞秒强激光与自由空气和充气毛细管相互作用产生三次谐波的实验研究 ,成功地获得了功率达0 .17GW、重复频率为 10Hz的紫外三次谐波信号。谐波的转换效率达到 0 .0 4%。对自由空气和充气毛细管中的谐波转换效率和谐波空间分布特性进行了比较。实验表明微毛细管虽然使谐波转换效率略有降低 ,但能有效地改善谐波的空间分布 。Generation of the third harmonic from the interaction between femtosecond intense laser pulses and atmosphere air is studied. The UV third harmonic with power as high as 0.17 GW and 10 HZ repetition is obtained successfully. An efficiency of the third-harmonic generation is up to 0.04%. The conversion efficiency and mode structure of the harmonics generated in free air and microcapillary are compared. The experimental results show that the conversion efficiency of THG is a little lower in capillary, but its radial profile is improved effectively which will benefit to practical application.

关 键 词：超短强激光 空气 三次谐波 辐射 微毛细管 相互作用 转换效率 空间分布 

分 类 号：O437[机械工程—光学工程]