金属靶和绝缘靶对飞秒激光吸收的比较  

Absorption of femtosecond laser pulses in metallic and dielectric slabs

作　　者：陈正林[1] 张杰[1] 陈黎明[1] 滕浩[1] 董全力[1] 赵理曾[1] 魏志义[1] 

机构地区：[1]中国科学院物理研究所光物理开放实验室,北京100080

出　　处：《物理学报》2003年第7期1672-1675,共4页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :10 0 0 5 0 14和 60 0 780 0 8);国家高技术惯性约束聚变基金;国家重点基础研究专项基金 (批准号 :G1990 0 75 2 0 0 )资助的课题~~

摘　　要：利用脉宽为 15 0fs、强度为 8× 10 1 5W cm2 的P偏振飞秒激光研究了与金属靶和绝缘靶相互作用过程中的激光能量吸收、超热电子产额及超热电子能谱 .实验发现 ,由于绝缘靶电导率小 ,因此其电荷分离势大于金属靶 ,从而导致绝缘靶比金属靶具有较小的激光能量吸收。Laser absorption, and hot electron emission and its energy spectrum are studied in the interaction between P-polarized femtosecond laser pulses at 8 x 10(15) W/cm(2) and solid-density plasmas. Comparison is made between the different behaviours of metallic and dielectric slabs irradiated by femtosecond laser pulses. It appears that there are less laser absorption, fewer hot electrons and higher hot electron temperature from dielectric slabs compared with metallic ones. These are concluded to be due to the lower conductivity and consequently lower charge separation potential of the dielectric slabs.

关 键 词：金属靶 绝缘靶 飞秒激光 激光能量吸收 超热电子产额 超热电子能谱 超热电子温度 等离子体 相互作用 

分 类 号：TN249[电子电信—物理电子学]