Bright Isolated Attosecond Soft X-Ray Pulses

Chen, M.-C.; Mancuso, Christopher; Hernández-García, Carlos; Dollar, F.; Galloway, Benjamin; Popmintchev, Dimitar; Langdon, B.; Auger, Amelie; Huang, Po-Yuan; Walker, Barry; Plaja, Luis; Jaroń-Becker, Agnieszka; Becker, Andreas; Murnane, Margaret M.; Kapteyn, Henry C.; Popmintchev, Tenio

doi:10.1007/978-3-319-13242-6_23

Cited by 9 publications

(13 citation statements)

References 5 publications

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“…The interaction of a strong laser field (~10 14 Wcm --2 ) with atoms or molecules gives rise to many phenomena, including strong--field ionization (SFI) [1,2] and high--harmonic generation (HHG) [3]. In HHG, coherent beams of extreme ultraviolet and soft X--ray light are generated [4][5][6][7][8][9], making it possible to implement coherent imaging of nanostructures with wavelength--limit spatial resolution [10][11][12], as well as uncovering new mechanisms for spin dynamics [13][14][15] and energy transport [16], all using a tabletop scale apparatus. Similarly, SFI has emerged as a breakthrough technique for probing the structure and dynamics of atoms and molecules, often with angstrom spatial resolution and attosecond temporal resolution [17,18].…”

Section: Introductionmentioning

confidence: 99%

Controlling electron-ion rescattering in two-color circularly polarized femtosecond laser fields

et al. 2016

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High harmonic generation driven by two-color counter-rotating circularly polarized laser fields was recently demonstrated experimentally as a breakthrough source of bright, coherent, circularly polarized beams in the extreme ultraviolet and soft X-ray regions. However, the conditions for optimizing the single-atom yield are significantly more complex than for linearly polarized driving lasers and are not fully understood. Here we present a comprehensive study of strong-field ionization-the complementary process to high-harmonic generation-driven by two-color circularly polarized fields. We uncover the conditions that lead to enhanced electron-ion rescattering, which should correspond to the highest single-atom harmonic flux. Using a velocity map imaging photoelectron spectrometer and tomographic reconstruction techniques, we record three-dimensional photoelectron distributions resulting from the strong-field ionization of argon atoms across a broad range of driving laser intensity ratios. In combination with analytical predictions and advanced numerical simulations, we show that "hard" electron-ion rescattering is optimized when the second harmonic field has an intensity approximately four times higher than that of the fundamental driving field. We also investigate electron-ion rescattering with co-rotating fields, and find that rescattering is significantly suppressed when compared with counter-rotating fields.

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Section: Introductionmentioning

confidence: 99%

Controlling electron-ion rescattering in two-color circularly polarized femtosecond laser fields

et al. 2016

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“…It is a key mechanism, along with ultrafast mid-IR driving sources, in coherent table-top x-ray sources [5,6], enabling the emission of isolated x-ray attosecond pulses [7] and increasing the efficiency of the process via phase-matching [8].…”

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confidence: 99%

Photoionization-Induced Emission of Tunable Few-Cycle Midinfrared Dispersive Waves in Gas-Filled Hollow-Core Photonic Crystal Fibers

et al. 2015

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We propose a scheme for the emission of few-cycle dispersive waves in the mid-infrared using hollow-core photonic crystal fibers filled with noble gas. The underlying mechanism is the formation of a plasma cloud by a self-compressed, sub-cycle pump pulse. The resulting free-electron population modifies the fiber dispersion, allowing phase-matched access to dispersive waves at otherwise inaccessible frequencies, well into the mid-IR. Remarkably, the pulses generated turn out to have durations of the order of two optical cycles. In addition, this ultrafast emission, which occurs even in the absence of a zero dispersion point between pump and mid-IR wavelengths, is tunable over a wide frequency range simply by adjusting the gas pressure. These theoretical results pave the way to a new generation of compact, fiber-based sources of few-cycle mid-IR radiation.

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“…Tunable intense attosecond x-ray pulses can probe such ultrafast processes and so gain a greater comprehension of the physics and chemistry that underlies a broad array of material phenomena [17,18]. Coherent x-ray pulses as short as 35 as have been produced via high-harmonic generation [19][20][21]. These pulses are easier to generate and of much higher quality than XFEL pulses but they are of significantly lower intensity, which makes it harder to use them in higher-order nonlinear spectroscopies.…”

Section: Introductionmentioning

confidence: 99%

Multidimensional resonant nonlinear spectroscopy with coherent broadband x-ray pulses

et al. 2016

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New x-ray free electron laser (XFEL) and high harmonic generation (HHG) light sources are capable of generating short and intense pulses that make x-ray nonlinear spectroscopy possible. Multidimensional spectroscopic techniques, which have long been used in the nuclear magnetic resonance, infrared, and optical regimes to probe the electronic structure and nuclear dynamics of molecules by sequences of short pulses with variable delays, can thus be extended to the attosecond x-ray regime. This opens up the possibility of probing core-electronic structure and couplings, the real-time tracking of impulsively created valence-electronic wavepackets and electronic coherences, and monitoring ultrafast processes such as nonadiabatic electron-nuclear dynamics near conical-intersection crossings. We survey various possible types of multidimensional x-ray spectroscopy techniques and demonstrate the novel information they can provide about molecules.

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Bright Isolated Attosecond Soft X-Ray Pulses

Cited by 9 publications

References 5 publications

Controlling electron-ion rescattering in two-color circularly polarized femtosecond laser fields

Controlling electron-ion rescattering in two-color circularly polarized femtosecond laser fields

Photoionization-Induced Emission of Tunable Few-Cycle Midinfrared Dispersive Waves in Gas-Filled Hollow-Core Photonic Crystal Fibers

Multidimensional resonant nonlinear spectroscopy with coherent broadband x-ray pulses

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