波长和偏振依赖的O2分子强激光场单电离  

Wavelength-and Polarization-Dependent Single Ionization of O2 in Strong Laser Fields

作　　者：林志阳 林宝卿 蒲继雄 Lin Zhiyang;Lin Baoqing;Pu Jixiong(Fujian Provincial Key Laboratory of Optical Beam Transmission and Transformation,College of Information Science and Engineering,Huaqiao University,Xiamen,Fujian 361021,China)

机构地区：[1]华侨大学信息科学与工程学院,福建省光传输与变换重点实验室,福建厦门361021

出　　处：《光学学报》2020年第8期9-16,共8页Acta Optica Sinica

基　　金：国家自然科学基金(11504116,11447188);福建省自然科学基金(2015J05009);华侨大学高层次引进人才科研启动项目(13BS407)。

摘　　要：实验上,在线偏振和圆偏振强激光场中测得同核双原子分子O2在两个不同波长(800 nm和1500 nm)下的离子产量随光强变化曲线,发现其呈现出有趣的波长和偏振依赖关系:O+2产量在长波长下比短波长下更低,且不同波长间O+2产量的差距在圆偏振光下相较线偏振下变得更大。利用散射矩阵(S-Matrix)理论模型定性地重复出实验结果,并从电子动量分布方面进一步确认了分子轨道效应对O2强场单电离的影响。In this study,the ion yields of homonuclear diatomic molecules(O2)were experimentally measured as a function of the laser intensity at two different wavelengths(800 and 1500 nm)in the linearly polarized(LP)and circularly polarized(CP)strong laser fields,exhibiting a peculiar dependence on wavelength and polarization.The O+2 yields were reduced at long wavelengths,and the yield difference between 800 and 1500 nm was larger in the CP field when compared with that in the LP field.The experimental results were qualitatively reproduced using the S-matrix model.Furthermore,the calculated electron-momentum distributions confirm the effect of the molecular orbitals on the strong-field single ionization of O2.

关 键 词：原子与分子物理学 单电离 O2分子 强激光场 波长和偏振依赖 

分 类 号：O561.1[理学—原子与分子物理] O561.4[理学—物理]