振动态H2+在抽运探测激光驱动下对谐波辐射强度的影响

理论研究振动态H_2~+在抽运探测激光驱动下对谐波辐射强度的影响.结果表明,在低振动态下(例如:υ=0),谐波辐射强度随抽运探测激光场延迟时间的增大而减小.随着振动态升高(例如:υ=2),不同延迟时间下的谐波辐射强度差减小.当振动态继续升高时(例如:υ=4),较大延迟时间下的谐波辐射强度反而高于较小延迟时间下的谐波辐射强度.最后,通过研究谐波辐射的时频分析图给出了谐波辐射强度变化的原因.

Effect on harmonic intensity from vibrating H2+ driven by pump-probe laser field

The effect on the harmonic intensity from vibrating H2+ driven by the pump-probe laser field has been theoretically investigated. The results show that for the low vibrational state (i.e. v = 0) case, the intensity of the harmonic spectrum is decreased as the delay time of the pump-probe pulse increases. With the increase of the vibrational state (i.e. v = 2), the harmonic intensity differences under different delay times are decreased. When the vibrational state is further increased (i.e. v = 4), the intensity of the harmonic spectrum under the larger delay time is higher than that of the smaller delay time case. Finally, by investigating the time-frequency analysis chart of harmonic spectrum, we reveal the physical mechanism of the harmonic intensity changes.