Multiple-harmonic generation in rare gases at high laser intensity

Li, X. F.; L’Huillier, Anne; Ferray, M.; Lompré, L. A.; Mainfray, G.

doi:10.1103/physreva.39.5751

Cited by 521 publications

(265 citation statements)

References 32 publications

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“…1.14, which are about 100 nm and 500 nm for the bow-tie antennas and the waveguides, respectively. In contrast, typical generation lengths for state-of-the-art HHG concepts are in the order of several millimeters or even centimeters [19,49]. This specific aspect of the nanostructure-enhanced implementations is of great importance for the later discussion of the findings in this work.…”

Section: Plasmon-enhanced Strong-field Gas Excitationmentioning

confidence: 61%

“…[19]. In this early experiment, a xenon gas jet was excited with amplified picosecond laser pulses at 1064 nm central wavelength.…”

Section: Extreme-ultraviolet Light Generation In Atomic Gasesmentioning

confidence: 99%

“…A typical phase matching coefficient |F conv | 2 10 −3 is assumed for the relevant harmonics [19], while nanostructure-based HHG is assigned |F nano | 2 = 1. Such considerations may also be relevant for related studies [26].…”

Section: Home-built Vacuum Setup For Euv Light Generation and Spectramentioning

confidence: 99%

“…High-order harmonic up-conversion of intense laser radiation in gaseous media was first discovered in the late 1980s [18,19,20] and allows for new experimental strategies in nanoscale photonic-imaging [21] or ultrafast spectroscopy [22,23] by providing fully coherent attosecond light pulses at extreme-ultraviolet (EUV) wavelengths. State-of-the-art HHG concepts typically utilize moderately focused, ultrashort laser pulses from kHz amplifier systems to reach intensities in excess of 10 13 W/cm 2 (for infrared light frequencies), which are necessary to drive the HHG process in an atomic gas.…”

Section: Introductionmentioning

confidence: 99%

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Extreme-ultraviolet light generation in plasmonic nanostructures

et al. 2013

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The present (cumulative) thesis examines fundamentals of nanostructure-enhanced extreme-ultraviolet light generation in noble gases using two different nanostructure geometries for local field-enhancement. Specifically, resonant antennas and tapered hollow waveguide nanostructures are utilized to enhance low-energy femtosecond laser pulses, which in turn induce light emission from excited xenon, argon and neon atoms and ions. Spectral analysis of this radiation reveals that coherent high-order harmonic generation is not feasible under the examined conditions, contrary to former expectations and reports. Instead, the spectral characteristics unequivocally identify that incoherent fluorescence from multiphoton excited and strong-field ionized gas atoms is the predominant process in such schemes. Furthermore, novel nanostructure-enhanced effects are reported such as surface-enhanced fifth-order harmonic generation (from bow-tie nanoantennas) and the formation of a bistable nanoplasma (in a hollow waveguide). These effects offer intriguing links between nonlinear nano-optics, plasma dynamics and extreme-ultraviolet radiation.v vi

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Section: Plasmon-enhanced Strong-field Gas Excitationmentioning

confidence: 61%

“…[19]. In this early experiment, a xenon gas jet was excited with amplified picosecond laser pulses at 1064 nm central wavelength.…”

Section: Extreme-ultraviolet Light Generation In Atomic Gasesmentioning

confidence: 99%

Section: Home-built Vacuum Setup For Euv Light Generation and Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extreme-ultraviolet light generation in plasmonic nanostructures

et al. 2013

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“…The first term ~disp is determined by the electron phase shift in the dispersion section. We have q~disp = ~ (~(t) --~/0) -}-~0, [5] where d~p/d7 is the dispersion strength defined in Ref. (8), which is the electron phase shift per unit energy deviation from a reference energy q'o in the dispersion section.…”

Section: Timentioning

confidence: 99%

Ultrashort ultraviolet free-electron lasers

Umstadter¹,

Yu²,

Johnson³

et al. 1994

Journal of X-Ray Science and Technology

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In this work we combine elements of chirped pulse amplification (CPA) techniques, now familiar in solid-state lasers, with an amplifier based upon a seeded free-electron laser (FEL), The resulting device would produce amplified pulses of unprecedented brevity at wavelengths shorter than can be currently obtained by any tunable laser system. We use a subharmonically seeded FEL to illustrate the concept. Radiation from a Ti:sapphire laser is frequency-tripled and stretched optically to provide a coherent seed pulse for the FEL. When coupled to an electron beam inside a magnetic wiggler, the seed radiation introduces an additional energy modulation on the electron bunch, which has been prepared with an energy chirp to match the chirp in the optical pulse. The energy modulated electrons are then spatially bunched in a dispersion magnet and introduced to a wiggler configured to be resonant to a harmonic of the seed laser, providing additional frequency multiplication. The coherent radiation produced by these electrons is amplified as it traverses the wiggler and recompressed optically. The preservation of phase coherence provided by this scheme results in a device which can yield 4-fs pulses with 0.3 mJ at a central wavelength of ca. 88 Am, easily the shortest duration amplified pulses produced by any laser. In this paper, we discuss various aspects of the concept, including the generation of short pulses, tempOral stretching and compression, and potential applications of the device. The phase distortion during the wide bandwidth FEL amplification is discussed in detail, and is shown to be within the bounds required to produce a 4-fs pulse upon compression.

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Localization of multiphoton ionization/dissociation resonance wave functions in AC fields

Moiseyev

1997

Int. J. Quant. Chem.

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Although it has been proved before J. Chem. Phys. 101, 9716 1995 that the complex scaled photoionizingrphotodissociating resonances are associated with Ž square integrable functions only when the time-dependent Hamiltonian is represented . in the velocity or acceleration gauges , it is proved here that in the length gauge a narrow Ž . resonance wave function and not a broad one! may diverge exponentially at some period of time but yet decays exponentially in space at some other time. When the exterior scaling method is used and the coordinate is rotated into the complex plane by Ž . an angle less than 180Њ the resonance quasi-energy state in the length gauge decays to zero, like a bound state, at any given time. The localization of the resonance quasi-energy Ž . Ž Floquet states in the length gauge as the laser frequency vanishes i.e., when the field is . varied slowly and can be considered as dc field is proven and found to be consistent w Ž .Ž .x with Herbst and Simon's proof Commun.

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Multiple-harmonic generation in rare gases at high laser intensity

Cited by 521 publications

References 32 publications

Extreme-ultraviolet light generation in plasmonic nanostructures

Extreme-ultraviolet light generation in plasmonic nanostructures

Ultrashort ultraviolet free-electron lasers

Localization of multiphoton ionization/dissociation resonance wave functions in AC fields

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