Intense quasi-monochromatic resonant harmonic generation in the multiphoton ionization regime

Singh, Mangaljit; Fareed, M. A.; Strelkov, V. V.; Grum–Grzhimailo, A. N.; Magunov, A. I.; Laramée, Antoine; Légaré, François; Ozaki, T.

doi:10.1364/optica.434185

Cited by 18 publications

(3 citation statements)

References 35 publications

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“…HHG in this scenario is actively studied experimentally using plasma plumes at metallic surfaces as the generating medium [40][41][42] (for a review see [43]). Using plasma for HHG allows, in particular, the resonant enhancement of the microscopic response [40,44,45]. However, the free-electron dispersion leads to a very short coherence length.…”

Section: Hfm In Plasmamentioning

confidence: 99%

Macroscopic effects in generation of attosecond XUV pulses via high-order frequency mixing in gases and plasma

Birulia,

Khokhlova,

Strelkov

2024

New J. Phys.

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We theoretically study the generation of attosecond XUV pulses via high-order frequency mixing (HFM) of two intense generating ﬁelds, and compare this process with the more common high-order harmonic generation (HHG) process. We calculate the macroscopic XUV signal by numerically integrating the 1D propagation equation coupled with the 3D time-dependent Schrödinger equation. We analytically ﬁnd the length scales which limit the quadratic growth of the HFM macroscopic signal with propagation length. Compared to HHG these length scales are much longer for a group of HFM components, with orders deﬁned by the frequencies of the generating ﬁelds. This results in a higher HFM macroscopic signal despite the microscopic response being lower than for HHG. In our numerical simulations in a gas target, the intensity of the HFM signal is several times higher than that for HHG, while for a plasma target the HFM generation efficiency is up to three orders of magnitude higher than for HHG. The HFM with relatively long generating pulses provides very narrow XUV lines (δω/ω = 4.6 × 10-4) with well-deﬁned frequencies, thus allowing for a simple extension of optical frequency standards to the XUV range. Finally, we show that the group of HFM components eﬀectively generated due to macroscopic eﬀects provides a train of attosecond pulses such that the carrier-envelope phase of an individual attosecond pulse can be easily controlled by tuning the phase of one of the generating ﬁelds.

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Section: Hfm In Plasmamentioning

confidence: 99%

Macroscopic effects in generation of attosecond XUV pulses via high-order frequency mixing in gases and plasma

Birulia,

Khokhlova,

Strelkov

2024

New J. Phys.

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“…High harmonic generation (HHG) driven by a strong laser field is an effective method for generating coherent ultrafast extreme ultraviolet radiation. − Nowadays, it has been widely used in many high-resolution imaging , and attosecond scientific applications. − While atoms and molecules in gaseous , and solid states , have been the most routinely used generation media, laser-ablated plasma plumes (LPPs) from the solid surface have been recognized as an interesting alternative type of medium. − Due to the less-dense LPPs, the origin of HHG in LPPs can be considered as the independent response of individual ions, which is similar to the gaseous HHG process. But considering the effect of electronic structure in the HHG process of some ions, − single-order resonance-enhanced harmonics may appear in the harmonic spectra. − …”

Section: Introductionmentioning

confidence: 99%

Enhancement of High-Order Harmonic Generation in Low-Density Ti Plasma Plumes Induced by Intense Laser Fields

Fu,

Yu,

et al. 2024

ACS Photonics

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High harmonic generation (HHG) of laser-ablated plasma plumes driven by an intense laser field is an effective method for generating coherent extreme ultraviolet radiation. We investigated the enhancement of high-order harmonics by the interaction of intense laser fields and laser-ablated low-density Ti plasma plumes. By analyzing the mechanism of HHG, the microscopic effect was proved to account for the enhancements of H27−H31. In addition, the density distribution of Ti plasma plumes was estimated and verified that the intensities of different order harmonics were influenced by different regions of Ti plasma plume density. Our results provide a pathway for optimizing the phase-matching conditions of resonant harmonics to improve the harmonic yield by means of controlling the density of laser-ablated plasma plumes (LPPs).

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“…Until recently, special attentions have been concentrated on atomic excited states prepared by a strong laser field [12][13][14][15][16][17][18][19][20][21][22][23] . These findings emphasize the crucial role of quantum coherence in strong field processes 12,[15][16][17][18]20 and open up promising applications in spectral compression 12,13,22,23 , space-time control of extreme ultraviolet radiation 18 and amplification of light fields 19 . However, these investigations are mainly carried out in neutral atoms.…”

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confidence: 99%

Ultraviolet supercontinuum generation driven by ionic coherence in a strong laser field

et al. 2022

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Supercontinuum (SC) light sources hold versatile applications in many fields ranging from imaging microscopic structural dynamics to achieving frequency comb metrology. Although such broadband light sources are readily accessible in the visible and near infrared regime, the ultraviolet (UV) extension of SC spectrum is still challenging. Here, we demonstrate that the joint contribution of strong field ionization and quantum resonance leads to the unexpected UV continuum radiation spanning the 100 nm bandwidth in molecular nitrogen ions. Quantum coherences in a bunch of ionic levels are found to be created by dynamic Stark-assisted multiphoton resonances following tunneling ionization. We show that the dynamical evolution of the coherence-enhanced polarization wave gives rise to laser-assisted continuum emission inside the laser field and free-induction decay after the laser field, which jointly contribute to the SC generation together with fifth harmonics. As proof of principle, we also show the application of the SC radiation in the absorption spectroscopy. This work offers an alternative scheme for constructing exotic SC sources, and opens up the territory of ionic quantum optics in the strong-field regime.

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Intense quasi-monochromatic resonant harmonic generation in the multiphoton ionization regime

Cited by 18 publications

References 35 publications

Macroscopic effects in generation of attosecond XUV pulses via high-order frequency mixing in gases and plasma

Macroscopic effects in generation of attosecond XUV pulses via high-order frequency mixing in gases and plasma

Enhancement of High-Order Harmonic Generation in Low-Density Ti Plasma Plumes Induced by Intense Laser Fields

Ultraviolet supercontinuum generation driven by ionic coherence in a strong laser field

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