量子电子学报, 2018, 35 (1): 63, 网络出版: 2018-01-30
空间非均匀场调控H+2分子谐波辐射的研究
Controlling H+2 molecular harmonic radiation by spatial inhomogeneous field
激光光学 高次谐波 H+2分子 空间非均匀激光场 阿秒脉冲 laser optics high-order harmonics H+2 molecule spatial inhomogeneous laser field
摘要
数值求解了非玻恩-奥本海默近似薛定谔方程,对空间非均场调控H+2分子谐波辐射及分布进行了理论研究。结果表明: 激光场 正向时,负向H核对谐波辐射贡献高于正向H核;激光场负向时,正向H核对谐波辐射贡献高于负向H核。激光空间位置远离原点时,谐波截止能量增大。 当激光空间位置为负向时,负向H核对高阶谐波贡献明显减弱。通过分析电离几率、谐波辐射时频分析图,用电子波包运动解释了谐波辐射过程。 通过叠加谐波可获得45 as超短脉冲。
Abstract
The non-Bohn-Oppenheimer approximation Schrodinger equation is solved numerically. The H+2 molecule harmonic radiation and distribution driven by the spatial inhomogeneous field are investigated theoretically. Results show that when the laser field is positive, the contribution from the negative-H to harmonic radiation is higher than that from the positive-H, and when the laser field is negative, the contribution from the positive-H to harmonic radiation is higher than that from the negative-H. The harmonic cutoff energy increases when the laser spatial position is far away from the origin. When the laser space position is negative, the contribution of negative-H to the higher harmonics decreases obviously. By analyzing the ionization probability, time-frequency analysis of harmonic radiation, the harmonic radiation process is explained by electronic wave packet motion. A 45 as ultrashort pulse can be obtained by superposing harmonics.
冯立强, 刘航. 空间非均匀场调控H+2分子谐波辐射的研究[J]. 量子电子学报, 2018, 35(1): 63. FENG Liqiang, LIU Hang. Controlling H+2 molecular harmonic radiation by spatial inhomogeneous field[J]. Chinese Journal of Quantum Electronics, 2018, 35(1): 63.