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Two-center interference in high-harmonic generation of H2%＋ in a combination of a mid-infrared laser field and a terahertz field

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Chinese Physics B 2017年第1期26卷 176-181页

作者： Jun Zhang Xue-Fei Pan Tong-Tong Xu Hong-Dan Zhang Hui Du Jing Guo Xue-Shen Liu Institute of Atomic and Molecular Physics Jilin University Changchun 130012 China

We theoretically investigate the two-center interference in high-order harmonics generated from the H2-＋ in a combination of a mid-infrared laser and a terahertz field by numerically solving the time-dependent Schr ¨odinger equation（TDSE）.The interference minima in high-order harmonic generation（HHG） are effectively suppressed when a THz field is *** contribution to HHG from the two separate nuclei is used to demonstrate the locating order of the harmonic ***, we also investigate the emission time of harmonics. The results show that the intensity of the short path around 60^th order after adding a THz field is stronger than that in the mid-infrared laser field, which further illustrates the suppression of the interference minima in HHG.

关键词： terahertz field high-order harmonic two-center interference

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Optical absorption and electromagnetically induced transparency in semiconductor quantum well driven by intense terahertz field

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Chinese Physics B 2012年第10期21卷 387-395页

作者：吴宏伟米贤武 College of Physical Science and Mechanical Engineering Jishou University

An approach for solving the excitonic absorption in a semiconductor quantum well driven by an intense terahertz field is *** formalism relies on the stationary single-photon Schro¨dinger equation in the full quantum mechanical *** optical absorption dynamics in both weak and strong couplings are discussed and *** excitonic absorption spectra show the Autler-Townes doublets for the resonance terahertz field,a replica peak for the non-resonance terahertz field,and the electromagnetically induced transparency phenomenon for modulating the decay rate of the second electron state in the weak *** particular,the electromagnetically induced transparency phenomenon window range is *** the strong coupling region,the multi-order energy level resonance splitting due to the strong optical field is *** are three（non-resonance terahertz field） or four（resonance terahertz field） peaks in the optical absorption *** work provides a simple and convenient approach to deal with the optical absorption in the exciton system.

关键词： semiconductor quantum well optical absorption spectrum terahertz field electromagnetically induced transparency

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terahertz field-induced modulations of intersubband absorptions in quantum wells

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Chinese Physics B 2006年第3期15卷 649-653页

作者：张拥华王长 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Mierosystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Nonlinear optical properties of intersubband electrons in a 3-level quantum well under intense terahertz field are investigated by using a density matrix approach. The results show that the terahertz fields with different frequencies cause the distinct modulations of the intersubband absorptions. The terahertz-indueed sideband and Autler-Towns splitting in the absorption spectrum are obtained, respectively for the terahertz-photon energy below and close to the transition energy between the ground and first excited state.

关键词： terahertz field intersubband transition sideband absorption AC-stark splitting

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