利用半周期激光场调控H_2~+谐波辐射过程

采用数值求解核与电子耦合的薛定谔方程,对H_2~+分子谐波辐射调控进行了研究.计算结果表明,激光场正向时,谐波能量主要来源于负向H核贡献;激光场负向时,谐波能量主要来源于正向H核.随后,通过适当引入半周期激光场,可以有效调节正负H核辐射谐波的强度.最后,适当叠加谐波谱上的谐波,可获得一个46 as的脉冲.该研究对调控分子谐波的辐射过程及阿秒脉冲的输出是有帮助的.

Controlling molecular harmonic generation from H2+ by using half-cycle pulse

The investigation on the control of the molecular harmonic generation from H2+ has been presented by solving the time-dependent Schrödinger equation. Calculated results show that when the laser field is larger than zero, the contribution from the negative-H to the harmonic spectrum plays the main role in harmonic generation; while when the laser field is smaller than zero, the harmonic emission from the positive-H plays the dominating contribution to the harmonic spectrum. Further, by properly adding a half-cycle pulse, the intensities of the harmonic spectra from the positive-H and the negative-H can be effective controlled. Finally, by superposing a properly selected harmonics, a 46 as pulse can be produced. The investigation is helpful to control the molecular harmonic generation and to produce the attosecond pulse.