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
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.