Zhao, D.D.ZhaoLi, F.-L.F.-L.LiSHIH-I CHU2019-12-262019-12-262013https://scholars.lib.ntu.edu.tw/handle/123456789/441592We present a theoretical investigation of the multiphoton resonance dynamics driven by intense frequency-comb and cavity-mode fields inside a femtosecond enhancement cavity (fsEC). The many-mode Floquet theorem is employed to provide a nonperturbative and exact treatment of the interaction between a quantum system and laser fields. The quasienergy structure driven by the frequency-comb laser field is modified by coupling the cavity-mode field and the multiphoton resonance processes between modified quasienergy states, resulting in the generation of even-order harmonics. The high-order harmonic generation (HHG) from a two-level system driven by the laser fields can be coherently controlled by tuning the laser parameters. In particular, the tuning intensity of the cavity-mode field allows one to coherently control the HHG power spectra without changing the absolute positions of comb frequencies.[SDGs]SDG7journal article10.1088/0953-4075/46/14/1454032-s2.0-84880288201https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880288201&doi=10.1088%2f0953-4075%2f46%2f14%2f145403&partnerID=40&md5=948f2e24dfa379cbed8edcf663409ab1