Feng and Kumar Reply:

Feng, Sheng; Kumar, Prem

doi:10.1103/physrevlett.103.149304

Cited by 61 publications

(122 citation statements)

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“…The carrier-envelope phase stabilized 1 mJ, 6 to 8 fs NIR pulses centered at 750 nm [18] were split into two parts. Half of the beam generated the isolated attosecond pulse using the generalized double optical gating (GDOG) [19] from argon gas, and the corresponding XUV supercontinuum spectrum covered the energy range between 20 and 40 eV. Measurements with an attosecond streak camera and reconstruction by the FROG-CRAB method confirmed the pulse duration to be $140 as [19].…”

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“…Half of the beam generated the isolated attosecond pulse using the generalized double optical gating (GDOG) [19] from argon gas, and the corresponding XUV supercontinuum spectrum covered the energy range between 20 and 40 eV. Measurements with an attosecond streak camera and reconstruction by the FROG-CRAB method confirmed the pulse duration to be $140 as [19]. The attosecond XUV pulse passed through a 300 nm Al foil and was focused by a toroidal mirror (f ¼ 250 mm, 9.6 grazing incidence angle) to a second glass gas cell with a 1 mm inner diameter and $30 m diameter hole on each side filled with 25 torr of argon gas where more than 80% of the XUV was absorbed.…”

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Attosecond Time-Resolved Autoionization of Argon

et al. 2010

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Autoionization of argon atoms was studied experimentally by transient absorption spectroscopy with isolated attosecond pulses. The peak position, intensity, linewidth, and shape of the 3s3p 6 np 1 P Fano resonance series (26.6-29.2 eV) were modified by intense few-cycle near infrared laser pulses, while the delay between the attosecond pulse and the laser pulse was changed by a few femtoseconds. Numerical simulations revealed that the experimentally observed splitting of the 3s3p 6 4p 1 P line is caused by the coupling between two short-lived highly excited states in the strong laser field. DOI: 10.1103/PhysRevLett.105.143002 PACS numbers: 32.70.Jz, 32.80.Zb, 78.47.JÀ Bridging the gap between atomic physics and the complex systems that make up the world around us requires indepth study of electron correlation. While rotation and vibration of molecules can be studied by femtosecond lasers [1], observation of the electron-electron interaction requires attosecond time resolution [2]. One of the most interesting processes governed by electron-electron correlation is autoionization [3]. The Fano profile, which is the signature of the autoionization process, has widespread significance in many scientific disciplines [4][5][6][7]. For decades, spectral-domain measurements with synchrotron radiation have served as a window into the rich dynamics of autoionization [4]. However, the synchrotron pulse duration is too long (100 fs to 100 ps) to time-resolve the Fano resonances since the autoionization lifetimes can be as short as a few femtoseconds.Since the generation of the first isolated attosecond pulses in 2001 [8], it was theoretically proposed [9][10][11][12][13] and experimentally demonstrated [14] that time-resolved Fano profiles can be studied using the attosecond streaking technique. To date, most theoretical and experimental investigations of autoionization processes have scrutinized Fano profiles as a function of the photoelectron energy. However, made possible by significant recent progress in short-pulse laser technology [15], timeresolved transient XUV photoabsorption measurements have become feasible, which gives access to complimentary studies of atomic autoionization in the time regime [16,17]. Photoabsorption measurements typically have higher data collection efficiency and better energy resolution than what can be obtained by detecting photoelectrons. The setup is all-optical, much simpler than the attosecond streak camera. Here we demonstrate the first transient absorption experiment using isolated attosecond pulses to probe the autoionization of atoms and show that the autoionization process is strongly modified by an intense laser field.Fano resonance profiles in the absorption spectrum are the result of interference between the direct ionization and the decay from an autoionizing state due to configuration interaction [3]. It is characterized by the resonance energy E r , its width that is related to the lifetime of the autoionizing state by ¼ @=À, and the q parameter, which represents the ratio...

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Attosecond Time-Resolved Autoionization of Argon

et al. 2010

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“…The production of single attosecond pulses (SAPs) [15][16][17] in the XUV regime enables a new class of experiments, in which a broadband electron wave packet is created in the continuum by a SAP and then steered by a synchronized IR field with stabilized carrier-envelope phase [18]. This decoupling of the creation and acceleration of continuum electrons provides a remarkable degree of control over electron motion.…”

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Attosecond Streaking in the Low-Energy Region as a Probe of Rescattering

Peng

Zhang

et al. 2011

Phys. Rev. Lett.

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“…For harmonics from gaseous medium, several techniques have already been demonstrated to generate ultra-broadband XUV pulses with shorter wavelengths. To generate attosecond pulses, different gating techniques, such as polarization gating, double optical gating or generalized double optical gating [3] are then applied. To extend the cutoff, driving lasers with wavelengths longer than 0.8 µm have been used [4].…”

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confidence: 99%