Inhomogeneous High Harmonic Generation in Krypton Clusters

Ruf, H.; Handschin, Charles; Cireasa, R.; Thiré, Nicolas; Ferré, A.; Petit, S.; Descamps, D.; Mével, E.; Constant, Éric; Blanchet, Valérie; Fabre, B.; Mairesse, Y.

doi:10.1103/physrevlett.110.083902

Cited by 70 publications

(54 citation statements)

References 32 publications

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“…The uncertainty of the exact mechanism of HHG from clusters has previously been outlined in a few papers [20,[41][42][43]. Among the considered channels, ionization and recombination to the same atom, to the neighboring ions, and to the whole nanoparticle have been proposed.…”

Section: B Harmonic Generation From Nanoparticle-containing Plasmasmentioning

confidence: 99%

“…Among the considered channels, ionization and recombination to the same atom, to the neighboring ions, and to the whole nanoparticle have been proposed. In particular, Ruf et al [20] attributed HHG in Kr clusters to a mechanism in which delocalized electrons tunnel form a cluster and recollide coherently with the whole cluster. Notice that the experiments with gas clusters have revealed a difficulty in disentangling the harmonics produced by different species (monomers and clusters of different sizes).…”

Section: B Harmonic Generation From Nanoparticle-containing Plasmasmentioning

confidence: 99%

“…In this case, the improvement of η is not only related with the increase of concentration of emitters, but also with specific properties of clusters. The cross section of recombination of the accelerated electron with the parent ion is higher for clusters than for atoms [20]. Also investigated are the effect on HG efficiency of the local field enhancement in the cluster vicinity, and of the plasmonic properties of nanoparticles and nanoantennas in gaseous media [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Ablation of nanoparticles and efficient harmonic generation using a 1-kHz laser

et al. 2013

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We report on high-order-harmonic generation in nanoparticle-containing laser ablation plasmas using a Ti:sapphire driving laser at a repetition rate of 1 kHz and on the relation of the harmonic signals with the morphological and spectroscopic characteristics of the ablation deposits. The study of the deposits has allowed the definition of ablation conditions, leading to the generation of a plasma containing nanoparticles of similar sizes to the ones used as target material. The corresponding plasma plumes lead to efficient conversion of the IR photons towards the short-wavelength range through high-order harmonic generation and show superior performance to those corresponding to bulk targets of the same metallic element.

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Section: B Harmonic Generation From Nanoparticle-containing Plasmasmentioning

confidence: 99%

Section: B Harmonic Generation From Nanoparticle-containing Plasmasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ablation of nanoparticles and efficient harmonic generation using a 1-kHz laser

et al. 2013

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“…For example molecules [8] and noble gas clusters [9][10][11] have been employed as generating medium.…”

mentioning

confidence: 99%

Enhancing the Macroscopic Yield of Narrow-Band High-Order Harmonic Generation by Fano Resonances

et al. 2014

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Resonances in the photo-absorption spectrum of the generating medium can modify the spectrum of high order harmonics. In particular, window-type Fano resonances can reduce photo-absorption within a narrow spectral region and, consequently, lead to an enhanced emission of high-order harmonics in absorptionlimited generation conditions. For high harmonic generation in argon it is shown that the 3s3p 6 np 1 P 1 window resonances (n=4,5,6) give rise to enhanced photon yield. In particular, the 3s3p 6 4p 1 P 1 resonance at 26.6 eV allows a relative enhancement up to a factor of 30 compared to the characteristic photon emission of the neighboring harmonic order. This enhanced, spectrally isolated and coherent photon emission line has a relative energy bandwidth of only ΔE/E=3·10 -3 . Therefore, it might be directly applied for precision spectroscopy or coherent diffractive imaging without the need of additional spectral filtering. The presented mechanism can be employed for tailoring and controlling the high harmonic emission of manifold target materials. High harmonic generation (HHG) driven by a strong laser field represents an attractive method for generating coherent radiation in the extreme ultraviolet spectral region [1,2] and is, nowadays, widely employed in atomic, molecular, plasma and solid state physics. Recently, even keV photon energies have been demonstrated by HHG providing a bright source of coherent X-rays [3]. In addition, HHG allows producing extremely short attosecond pulses, which enable groundbreaking investigations in the field of attosecond science [4]. Typically, HHG suffers however from its inherently low conversion efficiency, which hinders applications that are especially dependent on a high photon flux in order to achieve a good signal-to-noise ratio.In a simple single atom picture HHG can be described by a three-step model [5]: First, an electron tunnel-ionizes through the atomic potential, which is modified by the strong laser field. Second, the electron propagates in the strong laser field. Finally, the electron may recombine with its parent ion and gives, thus, rise to the emission of a photon (third step). In this picture, the power emitted by a single atom at the frequency ω q is proportional to the square of the amplitude of the oscillating dipole |A q (t)| 2 , which is induced by the recombination process [5].While the response of a single atom to the laser field (A q ) is extremely small, phase matching of a large number of emitters gives rise to a coherent build-up of high-order harmonic (HH) emission along the propagation direction of the driving laser through the generation medium.By optimizing the macroscopic generation conditions, hence, maximizing the number of phase-matched emitters, conversion efficiencies as high as of 4·10 -4 at 73 nm (17 eV) [6] and 5·10 -5 at 53 nm (23.3 eV) [7] have been achieved with 800 nm driving wavelength. With the help of a simple model, which takes the emission of all emitters along the propagation axis, phase-mismatch and absorption into accou...

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“…An example is the retrieval of structural and dynamical information on sub-nanometer and attosecond scales via high-harmonic generation. 9 Another example is the density contrast that can be obtained in the periodic structuring of the cluster jets, e.g., via an array of wires. 10 Here, a lower temperature in the jet increases the cluster size and improves the directedness of the flow, whereas the monomer contribution in the flow gives rise to shock waves that reduce the cluster size and the density contrast.…”

Section: Introductionmentioning

confidence: 99%

Revisiting argon cluster formation in a planar gas jet for high-intensity laser matter interaction

Yin

Hagmeijer

Weide

et al. 2016

Journal of Applied Physics

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We determine the size of argon clusters generated with a planar nozzle, based on the optical measurements in conjunction with theoretical modelling. Using a quasi-one dimensional model for the moments of the cluster size distribution, we determine the influence of critical physical assumptions. These refer to the surface tension depending on the presence of thermal equilibrium, the mass density of clusters, and different methods to model the growth rate of the cluster radius. We show that, despite strong variation in the predicted cluster size, 〈N〉, the liquid mass ratio, g, can be determined with high trustworthiness, because g is predicted as being almost independent of the specific model assumptions. Exploiting this observation, we use the calculated value for g to retrieve the cluster size from optical measurements, i.e., calibrated Rayleigh scattering and interferometry. Based on the measurements of the cluster size vs. the nozzle stagnation pressure, we provide a new power law for the prediction of the cluster size in experiments with higher values of the Hagena parameter (Γ*>104). This range is of relevance for experiments on high-intensity laser matter interactions.

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Inhomogeneous High Harmonic Generation in Krypton Clusters

Cited by 70 publications

References 32 publications

Ablation of nanoparticles and efficient harmonic generation using a 1-kHz laser

Ablation of nanoparticles and efficient harmonic generation using a 1-kHz laser

Enhancing the Macroscopic Yield of Narrow-Band High-Order Harmonic Generation by Fano Resonances

Revisiting argon cluster formation in a planar gas jet for high-intensity laser matter interaction

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