High-order harmonic and attosecond pulse generations from Rydberg state driven by the spatially inhomogeneous field

doi:10.1142/S0217984917500294

	High-order harmonic and attosecond pulse generations from Rydberg state driven by the spatially inhomogeneous field
	Liu, Hang 2; Li, Yi 1; Feng, Liqiang 1,2,3; Meng, Fanshun 1; Castle, R. S.1,2
刊名	MODERN PHYSICS LETTERS B
	2017-02-10
卷号	31 期号:4
关键词	High-order Harmonic Generation Rydberg State Attosecond X-ray Pulse Spatially Inhomogeneous Field
ISSN号	0217-9849
DOI	10.1142/S0217984917500294
文献子类	Article
英文摘要	High-order harmonic spectra and attosecond pulse generation from Rydberg atom (He+) driven by the spatially inhomogeneous field have been theoretically investigated. (i) Firstly, with an electron initially in a single excited Rydberg state (nth), the harmonic yield can be enhanced due to the decreased ionization potential, and a maximum enhancement can be obtained when the initial state is prepared as the third excited state (n = 3). However, the low cutoff energy from the excited state is unbeneficial to the generation of the higher photon pulse. Thus, with the further introduction of the laser chirp, not only the harmonic cutoff is extended, but also the harmonic modulation is reduced. As a result, five super-bandwidths from 63 eV to 267 eV can be found. (ii) Secondly, by preparing the initial state as a coherent superposition of excited state, the harmonic yield can be further enhanced, especially for the coherent superposition of the first and the third (n = 1 + 3) and the second and the fourth (n = 2 + 4) excited states, the harmonic yield is enhanced by 4-8 orders of magnitude compared with the case of the single ground initial state. Furthermore, by properly adding the laser pulse into the spatially inhomogeneous region (gap center x(0) = 0.0 a.u.) from left (x(0) < 0.0 a.u.) to right (x(0) > 0.0 a.u.), much higher cutoff energies can be obtained in the left region. As a consequence, two super-bandwidths of 248 eV and 496 eV can be obtained. Finally, by properly superposing the harmonics, a series of sub-25-as pulses with intensity enhancement of 5-8 orders of magnitude can be produced.
WOS关键词	NONLINEAR OPTICS ; ENHANCEMENT ; ATOM
WOS研究方向	Physics
语种	英语
出版者	WORLD SCIENTIFIC PUBL CO PTE LTD
WOS记录号	WOS:000395126600008
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/169374]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Feng, Liqiang
作者单位	1.Liaoning Univ Technol, Coll Sci, Jinzhou 121000, Liaoning, Peoples R China 2.Liaoning Univ Technol, Sch Chem & Environm Engn, Jinzhou 121000, Liaoning, Peoples R China 3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hang,Li, Yi,Feng, Liqiang,et al. High-order harmonic and attosecond pulse generations from Rydberg state driven by the spatially inhomogeneous field[J]. MODERN PHYSICS LETTERS B,2017,31(4).
APA	Liu, Hang,Li, Yi,Feng, Liqiang,Meng, Fanshun,&Castle, R. S..(2017).High-order harmonic and attosecond pulse generations from Rydberg state driven by the spatially inhomogeneous field.MODERN PHYSICS LETTERS B,31(4).
MLA	Liu, Hang,et al."High-order harmonic and attosecond pulse generations from Rydberg state driven by the spatially inhomogeneous field".MODERN PHYSICS LETTERS B 31.4(2017).