Wavelength-dependence of double optical gating for attosecond pulse generation

Tian, Jia; Li, Min; Yu, Junyan; Deng, Yongkai; Liu, Yunquan

doi:10.1088/1674-1056/23/10/104211

Cited by 2 publications

(1 citation statement)

References 33 publications

(38 reference statements)

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“…High order harmonic generation (HHG), which is known as a highly nonlinear process in laser-atom interaction, has been a topic of great interest in the past several decades because of its potential applications in the production of coherent extreme ultraviolet (XUV) source, [1][2][3][4] as well as the generation of attosecond pulses. [5][6][7][8][9][10][11][12][13][14][15][16] Attosecond pulses can be utilized as a unique tool to probe the ultrafast electronic dynamics inside atoms or molecules [17][18][19][20][21][22][23][24] and inaugurate a new domain for time-resolved metrology on an attosecond time scale. [25][26][27] During the laser-molecular interaction, the generated harmonics have also provided a promising method for the tomographic imaging of a molecular orbital.…”

Section: Introductionmentioning

confidence: 99%

Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization

Li¹,

Wei²,

He³

2015

Chinese Phys. B

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We theoretically investigate the quantum path selection in an ultraviolet (UV)-assisted near-infrared field with an UV energy below the ionization threshold. By calculating the ionization probability with different assistant UV frequencies, we find that a resonance-enhanced ionization peak emerges in the region Euv < Ip, where Euv is the photon energy and Ip is the ionization energy. With an attosecond pulse train (APT) centered in the resonance region, we show that the short quantum path can be well selected in the continuum case. By performing the electron trajectory analysis, we have further explained the physical mechanism of the quantum path selection. Moreover, we also demonstrate that in the resonance region, the harmonic emission from the selected paths is more efficient than that with the APT energy above the ionization threshold.

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Section: Introductionmentioning

confidence: 99%

Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization

Li¹,

Wei²,

He³

2015

Chinese Phys. B

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Quantum control of the XUV photoabsorption spectrum of helium atoms via the carrier-envelope-phase of an infrared laser pulse

杨增强¹,

张力达²

2015

Acta Phys. Sin.

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In the present paper, we investigate the quantum control of the XUV photoabsorption spectrum of helium atoms via the carrier-envelope-phase (CEP) of an infrared (IR) laser pulse by numerically solving the time-dependent one-dimensional (1D) two-electron Schrödinger equation. The advantage of the 1D model is that the associated time-dependent Schrodinger equation (TDSE) can be solved numerically with high precision as taking full account of the interaction between the electrons and without making any assumptions about the dominant physical mechanisms. In our study, a single attosecond XUV pulse with broad bandwidth is used to create a wave packet consisting of several doubly-excited states. Helium atoms subjected to the XUV pulse can be ionized through two different pathways: either direct ionization into the continuum or indirect ionization via the autoionization of doubly excited states. The interference of these two paths gives rise to the well-known Fano line shape in the photoabsorption spectrum, which is determined by the ratio and relative phases of the two paths. In the presence of an IR laser pulse, however, we find that the Fano line profiles are strongly modified, in good agreement with recent experimental observations [C. Ott et al., Science 340, 716 (2013); C. Ott et al., Nature 516, 374 (2014)]. At certain time delays, we can observe symmetric Lorentz, inverted Fano profiles, and even negative absorption cross sections, indicating that the XUV light can be amplified during the interaction with atoms. We fit the absorption spectra with the Fano line profiles giving rise to the CEP-dependent Fano q parameters, which are modulated from extremely large positive value to extremely large negative value. Since the q parameter is proportional to the ratio between the dipole matrix of the indirect ionization path and the dipole matrix of the direct ionization path; these results indicate that the quantum interference between the two ionization paths can be efficiently controlled by the CEP of an ultrashort laser pulse, thus offering another possibility (in addition to the laser intensity and the time delay between the XUV pulse and the IR laser) of manipulating the extreme ultrafast electronic motion in atoms. Our predictions can be experimentally verified easily with the present experimental technique.

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Wavelength-dependence of double optical gating for attosecond pulse generation

Cited by 2 publications

References 33 publications

Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization

Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization

Quantum control of the XUV photoabsorption spectrum of helium atoms via the carrier-envelope-phase of an infrared laser pulse

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