稀薄等离子体中逆轫致吸收的非线性强光效应  

NON-LINEAR INVERSE BREMSSTRAHLUNG ABSORPTION OF INTENSE LASER IN LOW-DENSITY PLASMA

作　　者：冯量[1] 霍裕昆[2] 

机构地区：[1]复旦大学李政道物理学综合实验室,上海200433 [2]复旦大学物理二系,上海200433

出　　处：《物理学报》1995年第12期1894-1903,共10页Acta Physica Sinica

基　　金：国家自然科学基金资助的课题

摘　　要：用相对论力学讨论了在强激光场中的电子运动以及与离子散射的截面.并由此研究了稀薄等离子体中的逆轫致吸收系数与激光强度的关系.发现由于非线性的相对论效应的影响,在激光强度较大时,轫致吸收系数将偏离与激光电场强度的立方反比关系.The motion of electrons and the cross-sections of electron-ion elastic collision in a strong laser field are discussed in the frame of relativistic quantum dynamics. Those cross-sections are applied to investigate the inverse bremsstrahlung absorption of laser beam in the low-density plasma. The results show that due to the nonlinear relativistic effect of strong laser field, the absorption coefficient will deviate from the Eo-3 dependence obtained from the nonrelativistic consideration (E0 is the amplitude of the laser electric field).

关 键 词：等离子体 逆轫吸收 稀薄 激光 强光效应 

分 类 号：O437[机械工程—光学工程] O53[理学—光学]