利用啁啾激光调制分子谐波信号
Signal modulations of molecular harmonic generation by using chirped pulse

数值研究了啁啾激光驱动H2+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。
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.