Chinese Optics Letters, 2021, 19 (4): 043201, Published Online: Feb. 4, 2021   

Even-order high-harmonic generation from solids in velocity gauge Download: 865次

Author Affiliations
1 State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser Science, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract
We present a velocity-gauge model for the generation of even-order high harmonics, and reveal that the even-order harmonics originate from the multiple-step transitions among the energy bands in momentum space, while the odd-order harmonics are mainly from direct transitions. The lower valence band is found vital for the generation of even harmonics. Relative intensity of even-order harmonics versus the odd orders is calculated and shows a growing trend as the laser field amplitude increases.

Jiayuan Cao, Na Li, Ya Bai, Peng Liu, Ruxin Li. Even-order high-harmonic generation from solids in velocity gauge[J]. Chinese Optics Letters, 2021, 19(4): 043201.

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