Yield enhancement of elliptical high harmonics driven by bicircular laser pulses
Xiaofan Zhang(张晓凡)1,† and Xiaosong Zhu(祝晓松)2,‡
1 Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, China; 2 Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract We theoretically investigate the yield enhancement of elliptical high harmonics in the interaction of molecules with bicircular laser pulses by solving the time-dependent Schrödinger equation. It is shown that by adjusting the relative intensity ratio of the two bicircular field components in specific ranges the yield of the molecular high harmonics for the plateau and cutoff regions can be respectively enhanced. To analyze this enhancement phenomenon, we calculate the weights of the electron classical trajectories. Additionally, we also study the ellipticity distribution of harmonics for different intensity ratios. We find that these enhanced harmonics are elliptically polarized, which we mainly attribute to the recombination dipole moment of the major weighted trajectories. These enhanced elliptical extreme ultraviolet and soft x-ray radiations may serve as essential tools for exploring the ultrafast dynamics in magnetic materials and chiral media.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11904269), the Natural Science Foundation of Hubei Province, China (Grant Nos. 2021CFB300 and 2020CFB362), and Scientific Research Program of Hubei Provincial Department of Education (Grant No. B2020176).
Xiaofan Zhang(张晓凡) and Xiaosong Zhu(祝晓松) Yield enhancement of elliptical high harmonics driven by bicircular laser pulses 2022 Chin. Phys. B 31 114209
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