利用啁啾激光调制分子谐波信号

数值研究了啁啾激光驱动H_2~+辐射谐波的特点.结果表明,(1)在低强度和高强度激光驱动下,谐波光谱分别呈现红移和蓝移现象.引入正负向啁啾参数后,谐波频移和谐波辐射强度都可以得到调控.(2)谐波光谱在高强度激光驱动下呈现非奇次谐波.理论分析表明,非奇次谐波产生的原因是双H核频移不一致所导致的不对称相消干涉引起的.

Signal modulations of molecular harmonic generation by using chirped pulse

Laser chirp effect on the high-order harmonic generation from H2+ has been theoretically investigated. It is found that (1) the red-shifts and the blue-shifts of the harmonics can be found in the lower and the stronger laser field. With the introductions of the up-chirp and the down-chirp, both the harmonic shifts and the harmonic yields can be controlled. (2) The non-odd harmonics can be produced when using the high-intensity driven laser field. Moreover, the non-odd harmonics mainly produce at the larger internuclear distance. Theoretical analyses show that the generations of the non-odd harmonics are attributed to the asymmetric destructive interference, caused by the asymmetric frequency modulation of the harmonics from two-H nuclei.