Signature of multi-channel interference in high-order harmonic generation from N-2 driven by intense mid-infrared pulses
文献类型：期刊论文
| 作者 | Li Gui-Hua1; Xie Hong-Qiang2; Yao Jin-Ping3; Chu Wei3; Cheng Ya3; Liu Xiao-Jun4; Chen Jing5; Xie Xin-Hua6 |
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2016-11-20 |
| 卷号 | 65期号:22 |
| 关键词 | mid-infrared femtosecond laser pulses high-order harmonic generation multi-channel interference of molecules |
| 英文摘要 | Recently, three major types of minima (i.e., Cooper-like minimum, two-center interference minimum and multi-channel interference minimum) have been observed in high-order harmonic generation (HHG) spectra. Identification of the origin of the minimum in a HHG spectrum is critical for self-probing of the molecular structures and dynamics, which has been an important subject in attosecond physics. In this paper, we report the investigation of the multi-electron dynamics in HHG from N-2 molecules driven by intense mid-infrared laser pulses. Based on a pump-probe experimental setup, clear spectral minima in the cutoff region of high harmonic spectra from N-2 molecules are observed in measurements with mid-infrared laser pulses at three wavelengths (i.e., 1300, 1400 and 1500 nm). A systematic investigation has been carried out for clarifying the origin of these minima. We carefully measured the spectral minima under three different experimental conditions: 1) different alignment angles of molecules; 2) various peak laser intensities; 3) tunable driving laser wavelengths. Experimental results show that the positions of the spectral minima do not depend on the alignment angles of molecules. In addition, the measured spectral minima shift almost linearly with the laser intensity for all three wavelengths, and the positions of the spectral minima strongly depend on the wavelengths of the driven field. These findings are in conflict with the Cooper-like and two-center interference minima predictions, providing strong evidences on the dynamic multi-channel interference origin of these minima. Besides, we theoretically calculated the positions of multi-channel interference minima by using a classical three-step model and found out perfect agreements between the experimental results and theoretical calculations, which again strongly support the multi-channel interference picture. Moreover, the advantages of the observed dynamic multi-channel interference based on HHG driven by long wavelength lasers are discussed. The long wavelength driver lasers are attractive for not only generating coherent XUV radiation and attosecond pulses, but also investigating structures and dynamics of molecules in strong laser fields. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Physics, Multidisciplinary |
| 研究领域[WOS] | Physics |
| 关键词[WOS] | X-RAY ; WATER WINDOW ; RARE-GASES ; PHASE ; POLARIZATION ; LASER ; MOLECULES ; ORBITALS ; DYNAMICS ; ATOMS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000389598500022 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/9985]  |
| 专题 | 武汉物理与数学研究所_原子分子光物理研究部 |
| 作者单位 | 1.East China Jiatong Univ, Sch Sci, Nanchang 330013, Peoples R China 2.East China Univ Technol, Sch Sci, Nanchang 330013, Peoples R China 3.Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China 4.Wuhan Inst Phys & Math, Chinese Acad Sci, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China 5.Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China 6.Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria |
| 推荐引用方式 GB/T 7714 | Li Gui-Hua,Xie Hong-Qiang,Yao Jin-Ping,et al. Signature of multi-channel interference in high-order harmonic generation from N-2 driven by intense mid-infrared pulses[J]. ACTA PHYSICA SINICA,2016,65(22). |
| APA | Li Gui-Hua.,Xie Hong-Qiang.,Yao Jin-Ping.,Chu Wei.,Cheng Ya.,...&Xie Xin-Hua.(2016).Signature of multi-channel interference in high-order harmonic generation from N-2 driven by intense mid-infrared pulses.ACTA PHYSICA SINICA,65(22). |
| MLA | Li Gui-Hua,et al."Signature of multi-channel interference in high-order harmonic generation from N-2 driven by intense mid-infrared pulses".ACTA PHYSICA SINICA 65.22(2016). |
入库方式： OAI收割
来源：武汉物理与数学研究所
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