激光脉宽对H2^+谐波辐射的影响

Effect of Pulse Duration on Harmonic Emission from H2^+

理论研究了不同激光脉宽对H2+谐波辐射强度的影响。结果表明:在短脉宽激光驱动下,H2^+谐波辐射主要来源于激光下降区域;而在长脉宽激光驱动下,激光上升区域对H2^+谐波辐射作用增大,并起到主要贡献作用。理论分析表明,H2^+进入电荷共振增强电离区域的差异性是产生上述现象的根本原因。

The influence of different pulse durations on harmonic intensity from H2^+was theoretically studied.The results show that under the shorter pulse duration case,the harmonic intensity from H2^+mainly comes from the laser drop region;while,under the longer pulse duration case,the harmonic intensity of H2^+from the laser rising region is increased and it makes a major contribution to the harmonic spectrum.Theoretical analyses show that the difference time of H2+for entering charge resonance enhancement ionization region is the essential reason for the above phenomenon.