High-order harmonic generation of Li+ with combined infrared and extreme ultraviolet fields Project supported by the National Natural Science Foundation of China (Grant Nos. 11465016, 11664035, 11764038, and 11765018) and the Foundation of Northwest Normal University, China (Grant No. NWNU-LKQN-17-1). |
(color online) Ionization level of Li+ in the IR and IR + XUV laser fields for the parameters used in Fig. |