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REVIEW 3 major objections 5 minor 73 references

Enhanced Control of High Harmonic Generation in Mixed Argon-Helium Gaseous Media

T0 review · 3 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read Mixing argon and helium in a gas jet can sculpt the emitted high-harmonic spectrum through species-specific interference, and separating the gases into two jets turns Gouy phase into a spectral tuning dial.

desk verdict The mixed-gas HHG control idea is sound, but the headline suppression at 96.4% He is quantitatively inconsistent with the paper's own single-atom yield ratio. read the letter →

arxiv 2507.01537 v1 pith:LABI5FUJ submitted 2025-07-02 physics.optics

José Miguel Pablos-Marín , Javier Serrano , Carlos Hernández-García This is my paper
classification physics.optics PACS 42.65.Ky32.80.Rm
keywords highharmonicgenerationmixedgastargetsargon-heliummixturesattosecondpulsesintrinsicdipolephaseinterferencecontrolGouyEUVspectralshaping
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper claims that mixing argon and helium in a high-harmonic-generation gas target modulates the emitted extreme-ultraviolet spectrum through coherent interference between the single-atom emissions of the two species, and that the modulation can be tuned by the mixture ratio. A simple concentration-weighted superposition of the two species' harmonic fields, which differ only in their intensity-dependent intrinsic dipole phase, reproduces the deep suppression seen in full quantum macroscopic simulations near harmonic order 30 at 96.4% helium. The paper further claims that placing the two gases in separate jets symmetrically displaced from the focus introduces a Gouy-phase shift that moves the interference pattern across the entire harmonic bandwidth. This matters because it offers a non-laser knob for shaping EUV and attosecond pulses, complementing metallic filters, and it can identify species-specific contributions to high harmonic generation.

What carries the argument

The carrying object is a two-species coherent-superposition field model: the total q-th harmonic field from a thin slab is E_q = (eta/100) E_q^He + (1 - eta/100) E_q^Ar, where each species' field carries the same driving-field amplitude scaling but a species-specific intrinsic dipole phase determined by ionization potential. This dipole-phase difference is the interference engine behind the spectral modulations. The second mechanism is the Gouy phase of a focused Gaussian beam, which the paper exploits by symmetrically displacing the two gas jets from the focal plane to add a controllable phase offset between the species.

What would settle it

Measure the far-field HHG spectrum of a single selected burst, for example by attosecond lighthouse or few-cycle gating, from an 800 nm, 2.84e14 W/cm2 Ar-He jet as the helium concentration is scanned from 85% to 98%; the claim requires a spectral minimum around harmonic 29-30 whose position moves with concentration and with the symmetric displacement of the two jets.

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Extended reading notes

Core claim

The discovery is that the high-order harmonic spectrum of an Ar-He mixture is not the intensity-weighted sum of the two pure-gas spectra but the coherent sum of their fields, so the relative phase between the species determines the spectrum. Because helium and argon have different ionization potentials, the same harmonic order acquires different intrinsic dipole phases in the two atoms; when the mixture ratio brings the two contributions to comparable amplitude, their interference produces a frequency-dependent suppression. In macroscopic simulations of an 800 nm, 2.84e14 W/cm2, 7.7 fs pulse focused in a low-density gas jet, a helium concentration of 96.4% produces a pronounced minimum near the 30th harmonic in the isolated central attosecond burst, while the 37th harmonic is barely affected. The same suppression is predicted by the semiclassical thin slab model, confirming the mechanism, and separating the gases into two jets displaced by plus or minus $\Delta$-z adds the Gaussian beam's Gouy phase as an independent control that shifts the spectral interference across the harmonic comb.

Load-bearing premise

The central claim assumes a single attosecond burst can be cleanly isolated in practice, because the interference minimum near harmonic 30 is predicted only for the selected central burst and would be averaged out over the full pulse train.

Editorial extensions

If this is right

  • A helium concentration near 96.4% creates a deep suppression around harmonic 30 in the isolated central burst, so the mixture ratio can place a spectral notch at a chosen harmonic order.
  • Symmetric displacement of two separate Ar and He jets moves that notch across the full harmonic bandwidth, making the spectral shape controllable by jet geometry rather than by laser or filter changes.
  • Because the interference survives macroscopic phase-matching in low-density jets, the effect should be observable in realistic experimental conditions, not only in single-atom simulations.
  • The same species-phase mechanism should generalize to other noble-gas pairs, with the difference in ionization potentials setting the phase offset and hence the notch position.
  • The two-jet configuration could provide a flexible alternative to metallic spectral filters for shaping the bandwidth of attosecond pulses.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The notch is demonstrated only after a manual temporal window selects the central burst; simulating the proposed gating schemes (few-cycle envelope, attosecond lighthouse, trapezoidal pulse) would show whether the notch survives without post-selection.
  • If the intensity dependence of the dipole phase is as modeled, spatial intensity variations across a real focus will smear the notch; a flattened spatial profile or tighter phase-matching could sharpen it.
  • Scanning the helium concentration around 85-98% while recording one selected burst would turn the mixture into a quantitative probe of the relative single-atom phase between Ar and He, connecting to harmonic ellipsometry measurements.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper investigates high harmonic generation (HHG) in mixed argon-helium gaseous media. Using an AI-based macroscopic simulation approach—neural-network single-atom responses trained on 3D-TDSE data, propagated with a Maxwell solver—and a simpler thin-slab model (TSM), the authors claim that coherent interference between harmonics emitted by Ar and He creates tunable spectral modulations. They report a deep suppression near harmonic 30 at 96.4% He concentration, visible after isolating a single attosecond burst, and show that displacing two species-separated jets symmetrically around the focus provides additional Gouy-phase-based control over the spectrum.

Significance. If the results are correct, the paper offers a new, experimentally relevant control knob for tailoring EUV and attosecond sources, and it provides a physical picture—species-dependent dipole-phase interference—that could be extended to other gas combinations. The strengths are the use of validated AI-based macroscopic simulations (trained on independent 3D-TDSE data and previously benchmarked against experiments) and the transparent TSM that makes the interference mechanism explicit. However, the quantitative self-consistency of the amplitude ratios and the practical realizability of the required single-burst selection need to be established before the central claims can be accepted.

major comments (3)
  1. [Section 3, Fig. 3c; Section 2, Eq. (3)] The claimed 'pronounced minimum' near H30 at η=96.4% (Fig. 2f) is inconsistent with the reported single-atom yield ratio. In Fig. 3c the He/Ar HHG yield ratio at H29 is about 40%, corresponding to an amplitude ratio of r≈0.63 if the plotted quantity is intensity, or r≈0.4 if it is amplitude. For a deep destructive minimum at η=0.964, the macroscopic He and Ar contributions must be nearly equal, which would require r≈(1−η)/η≈0.037. With the stated r, the maximum intensity modulation at η=0.964 is only about 1–2 dB (min/max intensity ≈0.79 for r=0.63, and ≈0.69 for r=0.4), not the strong suppression shown and described. The TSM of Eq. (3) sidesteps this by assuming identical single-atom amplitudes for Ar and He (stated in the Fig. 3 caption), an assumption not supported by the independent 3D-TDSE results. This discrepancy is load-bearing because it undermines the quantitative basis for the choice η=96.4% and for the claim that the modulation arises from single-atom coherent interference. The authors should report the actual complex macroscopic amplitudes of the He and Ar contributions at H29/H30 in the advanced simulation, or move the demonstration to the concentration that the measured/simulated amplitude ratio actually optimizes (η*≈60–70%), or explicitly revise the claim to a much weaker modulation.
  2. [Section 3, Figs. 2c-2d; Section 4] The key spectral minimum is only visible after the authors manually isolate the central attosecond burst by applying a temporal window between 10.4 fs and 11.2 fs. The paper suggests that this selection could be achieved in practice with few-cycle driving pulses, the attosecond lighthouse effect, or a trapezoidal driving envelope, but none of these possibilities is simulated or demonstrated. If such gating cannot be realized cleanly, the interference minimum will be averaged over the full pulse train and the claimed practical control of the EUV spectrum would largely disappear. The authors should either simulate at least one of the proposed gating schemes with the same macroscopic model, or quantify the visibility of the modulation in the ungated spectrum; the current treatment leaves the main observable contingent on an untested post-selection step.
  3. [Section 3, paragraph after Fig. 2a] The statement that 'a regime of comparable HHG contributions from both gases emerges for η%>80' is not supported by the single-atom data. From Fig. 1b and Fig. 3c, the He yield is only about 40% of the Ar yield at H29; at η=80% this gives a simple density-weighted He contribution of 0.8×0.4=0.32 versus 0.2 for Ar (if the plotted quantity is intensity), a factor of 1.6 in intensity, and at η=96.4% the He contribution dominates by about a factor of 10 if the single-atom ratios remain representative. If the macroscopic propagation changes these relative weights, the authors should show this explicitly, for example by plotting the per-species far-field intensities before summation, since the 'comparable contributions' regime is the physical precondition for the interference effect claimed.
minor comments (5)
  1. [Throughout] The word 'specie' appears in the abstract, the Introduction, and Section 2; it should be 'species'.
  2. [Discussion] There is a typo in the Discussion: 'thin metallic filers' should be 'thin metallic filters'.
  3. [Fig. 3c] The text should state explicitly whether the plotted ratio is an intensity ratio or an amplitude ratio, as this is central to interpreting the numbers used in the argument.
  4. [Section 3] The definition of the Gaussian spectral window 'width 6ω0' should specify whether this is the full width at half maximum or the standard deviation, and in which spectral variable.
  5. [Fig. 4] The caption should clarify whether the two displaced jets are pure Ar and pure He or contain mixtures, and how the fixed He concentration η=96.4% is realized when the jets are displaced.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the core mixed-gas interference result rests on independent 3D-TDSE-trained simulations, not on fitted inputs or self-citation chains.

full rationale

The paper's central claim—that Ar-He mixtures produce tunable HHG interference minima—is supported by two independent computational routes. The AI-assisted macroscopic simulations train separate neural networks on 3D-TDSE single-atom data for Ar and He (Section 2); no network is trained on or fitted to the mixed-gas spectra that constitute the reported result. The propagation uses an independently validated Maxwell solver, so the macroscopic interference emerges from the single-atom inputs rather than being imposed by a fitted parameter. The TSM (Eqs. 2-3) is an interpretive slab model whose coherent sum is, by construction, an interference formula, but it is used only as a post-hoc explanatory tool and is explicitly checked against the AI simulation (Figs. 3-4), so it does not smuggle the conclusion into the evidence. The method self-citations [63,64,66,67] are to prior validated propagation and TSM work and are not uniqueness constraints or fitted parameters. The practical caveat about temporal gating of the central burst (10.4-11.2 fs) is a feasibility limitation, not a circular step. A separate internal-consistency question—whether the reported He/Ar single-atom yield ratio at H29 allows a deep minimum at eta=96.4%—is a correctness or skepticism issue, not circularity, because the prediction does not reduce to a fitted input or to a self-citation.

Assumptions & free parameters 3 free parameters · 6 assumptions · 0 invented entities

The paper introduces no new physical entities. Its central modeling rests on standard HHG approximations and on a simple coherent-sum model whose parameters, p=4 and equal amplitudes, are stated. No constants are fitted to the target mixed-gas spectra, and the key interference prediction emerges from independent TDSE-based simulations and a transparent thin slab model.

free parameters (3)
  • TSM harmonic amplitude scaling power p = 4
    Assumed identical for Ar and He in Eq. (2), taken from prior work [67]; if the true p differs between species, the TSM quantitative predictions would change.
  • Temporal window for central burst isolation = 10.4 fs to 11.2 fs
    Manual selection window applied to the time-frequency output to expose the interference minimum; the paper proposes experimental equivalents but does not simulate them.
  • Gaussian spectral window width = 6 omega_0
    Standard Gabor window width chosen for time-frequency analysis; not central to the main claim but used in Fig. 2.
assumptions (6)
  • domain assumption Single-active-electron approximation for He and Ar in 3D-TDSE
    Used to generate single-atom training data; standard in HHG modeling.
  • domain assumption Neural network surrogates accurately reproduce 3D-TDSE results
    Relies on validation in [63], not re-derived here; MSE on the order of 10^-6 is reported on normalized outputs.
  • domain assumption Low-density gas mixture (5 Torr) permits neglecting absorption, plasma dispersion, and species-dependent phase matching
    Invoked to justify infinitely thin jets and the coherent-sum treatment; acknowledged in the Discussion to break down at higher densities.
  • ad hoc to paper Harmonic emission from Ar and He have identical amplitudes in the TSM of Fig. 3
    Explicitly stated in Section 2; used to isolate the phase-interference effect, but actual yields differ by a factor of about 2.5 at harmonic 29.
  • domain assumption Short trajectory contributions dominate in macroscopic phase matching
    Standard HHG assumption; the TSM includes only short trajectories.
  • standard math Symmetric two-jet displacement leaves the peak intensity equal in both jets
    True for a Gaussian beam because the intensity is an even function of z about the focus; the only remaining phase difference is the Gouy phase.

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Cite this review

Pith. "Pith review of Enhanced Control of High Harmonic Generation in Mixed Argon-Helium Gaseous Media." pith.science (2026). https://pith.science/paper/LABI5FUJ

@misc{pith2026250701537,
  author       = {Pith},
  title        = {Pith review of: Enhanced Control of High Harmonic Generation in Mixed Argon-Helium Gaseous Media},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/LABI5FUJ}},
  note         = {Machine review of arXiv:2507.01537}
}
read the original abstract

High harmonic generation (HHG) in gaseous media provides a robust method for producing coherent extreme-ultraviolet (EUV) radiation and attosecond pulses. However, the spectral and temporal properties of these pulses -- such as bandwidth and chirp -- are fundamentally limited by the underlying generation mechanisms. Typically, tailoring the EUV emission involves modifying the properties of the intense infrared femtosecond driving pulse, and/or the macroscopic laser-matter configuration. Here, we focus on controlling the HHG process through the gas specie, introducing mixed-gas targets as a practical approach to enhance control over the EUV harmonic radiation. Through advanced simulations assisted by artificial intelligence that take into account both the quantum microscopic and macroscopic aspects of HHG, we demonstrate how mixtures of argon and helium modulate the emitted EUV harmonics. A simple model reveals that these modulations arise from coherent interference between harmonics emitted by different species at the single-atom level, and that they can be tuned by adjusting the macroscopic relative concentrations. Furthermore, by spatially separating the gas species into two distinct jets in a symmetric configuration, we gain additional control over the whole harmonic bandwidth. This strategy provides a realistic and versatile pathway to tailor EUV light and attosecond sources via HHG, while also enabling the identification of species-specific contributions to the process.

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Works this paper leans on

73 extracted references · 57 canonical work pages

  1. [1]

    McPherson A, Gibson G, Jara H, Johann U, Luk TS, McIntyre IA, Boyer K, and Rhode CK, Studies of multiphoton production of vacuum-ultraviolet radiation in the rare gases. J. Opt. Soc. Am. B 4, 595-601 (1987). https://doi.org/10.1364/JOSAB.4.000595

    work page doi:10.1364/josab.4.000595 1987

  2. [2]

    Ferray M, L’Huillier A, Li XF, Lompé LA, Mainfray G, Manus C, Multiple harmonic conversion of 1064 nm radiation in rare gases. J. Phys. B: At. Mol. Opt. Phys. 21, L31-L35 (1988). doi:10.1088/0953-4075/21/3/001

    work page doi:10.1088/0953-4075/21/3/001 1988

  3. [3]

    Agostini P, DiMauro LF, The physics of attosecond light pulses. Rep. Prog. Phys. 67 813 (2004). doi: 1088/0034- 4885/67/6/R01

    work page 2004

  4. [4]

    Krausz F and Ivanov M, Attosecond physics. Rev. Mod. Phys. 81, 163 (2009). https://doi.org/10.1103/RevModPhys.81.163

    doi:10.1103/revmodphys.81.163 2009

  5. [5]

    Ghimire S, DiChiara AD, Sistrunk E, Agostini P, DiMauro LF, Reis DA, Observation of high-order harmonic generation in a bulk crystal. Nat. Phys., 7(2), 138-141. (2011). https://doi.org/10.1038/nphys1847

    doi:10.1038/nphys1847 2011

  6. [6]

    https://www.science.org/doi/10.1126/science.1218497

    Popmintchev T, Chen MC, Popmintchev D, Arpin P, Brown S, Ališauskas S, Andriukaitis G, Balčiunas T, Mücke OD, Pugzlys A, Bright coherent ultrahigh harmonics in the kev x-ray regime from mid-infrared femtosecond lasers, Science 336 1287–1291 (2012). https://www.science.org/doi/10.1126/science.1218497

    work page doi:10.1126/science.1218497 2012

  7. [7]

    Schafer K, Yang B, DiMauro LF, and Kulander KC, Above threshold ionization beyond the high harmonic cutoff. Phys. Rev. Lett. 70, 1599-1602 (1993). https://doi.org/10.1103/PhysRevLett.70.1599

    work page doi:10.1103/physrevlett.70.1599 1993

  8. [8]

    Corkum PB, Plasma Perspective on Strong-field Multiphoton Ionization. Phys. Rev. Lett. 71, 1994-1997 (1993). https://doi.org/10.1103/PhysRevLett.71.1994

    doi:10.1103/physrevlett.71.1994 1993

Show all 73 references
  1. [9]

    Lompré L, Lhuillier A, Ferray M, Monot P, Mainfray G, Manus C, High-order harmonic generation in xenon: intensity and propagation effects. J. Opt. Soc. Am. B 7, 754-761 (1990). https://doi.org/10.1364/JOSAB.7.000754

    1990 doi

  2. [10]

    Lewenstein M, Balcou P, Ivanov MY, L’Huillier A, Corkum PB, Theory of high-harmonic generation by low- frequency laser fields. Phys. Rev. A 49, 2117 (1994). https://doi.org/10.1103/PhysRevA.49.2117

    1994 doi

  3. [11]

    https://www.science.org/doi/10.1126/science.aac9755

    Popmintchev D, Hernández-García C, Dollar F, Mancuso C, Pérez-Hernández JA, Chen MC, Hankla A, Gao X, Shim B, Gaeta AL, Ultraviolet surprise: Efficient soft x-ray high-harmonic generation in multiply ionized plasmas, Science 350 1225–1231 (2015). https://www.science.org/doi/10...

    2015 doi

  4. [12]

    Seres E, Seres J, Spielmann C, X-ray absorption spectroscopy in the keV range with laser generated high harmonic radiation. Appl. Phys. Lett. 89, 181919 (2006). https://doi.org/10.1063/1.2364126

    2006 doi

  5. [13]

    Lewenstein M, Salières P, L’Huiller A, Phase of the atomic polarization in high-order harmonic generation. Phys. Rev. A 52, 4747-4754 (1995). https://doi.org/10.1103/PhysRevA.52.4747

    1995 doi

  6. [14]

    Bellini M, Lyng C, Tozzi A, Gaarde MB, Hänsch T, L’Huillier A, Wahlström C, Temporal Coherence of Ultrashort High-Order Harmonic Pulses. Phys. Rev. Lett. 81, 297-300 (1998). https://doi.org/10.1103/PhysRevLett.81.297

    1998 doi

  7. [15]

    Science, 302, 1540 (2003)

    Mairesse Y, de Bohan A, Frasinski LJ, Merdji H, Dinu LC, Monchicourt P, Breger P, Kovacev M, Taïeb R, Carré B, Muller HG, Agostini P, Salières P, Attosecond Synchronization of High-Harmonic Soft X-rays. Science, 302, 1540 (2003). https://www.science.org/doi/full/10.1126/scienc...

    2003 doi

  8. [16]

    Zaïr A, Holler M, Guandalini A, Schapper F, Biegert J, Gallmann L, Keller U, Wyatt AS, Monmayrant A, Walmsley IA, Cormier E, Auguste T, Salières P, Quantum Path Interferences in High-Order Harmonic Generation. Phys. Rev. Lett. 100, 143902 (2008). https://doi.org/10.1103/PhysRe...

    2008 doi

  9. [17]

    https://www.science.org/doi/10.1126/science.1059413

    Paul PM, Toma ES, Breger P, Mullot G, Augé F, Balcou P, Muller HG, Agostini P, Observation of a train of attosecond pulses from high harmonic generation, Science 292 1689–1692 (2001). https://www.science.org/doi/10.1126/science.1059413

    2001 doi

  10. [18]

    Attosecond metrology

    Hentschel M, Kienberger R, Spielmann C, Reider GA, Milosevic N, Brabec T, Corkum P, Heinzmann U, Drescher M, Krausz F. Attosecond metrology. Nature 414, 509–513 (2001). https://doi.org/10.1038/35107000

    2001 doi

  11. [19]

    https://doi.org/10.1038/nature16528 J.M

    Hassan MT, Luu TT, Moulet A, Raskazovskaya O, Zhokhov P, Garg M, Karpowicz N, Zheltikov AM, Pervak V, Krausz F, Goulielmakis E, Optical attosecond pulses and tracking the nonlinear response of bound electrons, Nature 530 66–70 (2016). https://doi.org/10.1038/nature16528 J.M. P...

    2016 doi

  12. [20]

    Calegari F, Trabattoni A, Palacios A, Ayuso D, Castrovilli MC, Greenwood JB, Decleva P, Martín F, Nisoli M, Charge migration induced by attosecond pulses in bio-relevant molecules, J. Phys. B: At. Mol. Opt. Phys. 49 142001 (2016). https://doi.org/10.1088/0953-4075/49/14/142001

    2016 doi

  13. [21]

    https://www.science.org/doi/abs/10.1126/science.aao5624

    Beaulieu S, Comby A, Clergerie A, Caillat J, Descamps D, Dudovich N, Fabre B, Géneaux R, Légaré F, Petit S, Pons B, Porat G, Ruchon T, Taïeb R, Blanchet V, Mairesse Y, Attosecond-resolved photoionization of chiral molecules, Science 358 (6368) (2017) 1288–1294. https://www.sci...

    2017 doi

  14. [22]

    https://doi.org/10.1126/science.abb9318

    Grundmann S, Trabert D, Fehre K, Strenger N, Pier A, Kaiser L, Kircher M, Weller M, Eckart S, Schmidt LPH, Trinter F, Jahnke T, Schöffler MS, Dörner R, Zeptosecond birth time delay in molecular photoionization, Science 370 339–341 (2020). https://doi.org/10.1126/science.abb9318

    2020 doi

  15. [23]

    Borrego-Varillas R, Lucchini M, Nisoli M, Attosecond spectroscopy for the investigation of ultrafast dynamics in atomic, molecular and solid-state physics, Rep. Prog. Phys. 85 066401 (2022) https://doi.org/10.1088/1361-6633/ac5e7f

    2022 doi

  16. [24]

    https://doi.org/10.1126/science.aaf6793

    Tao Z, Chen C, Szilvási T, Keller M, Mavrikakis M, Kapteyn H, Murnane M, Direct time-domain observation of attosecond final-state lifetimes in photoemission from solids, Science 353 62–67 (2016). https://doi.org/10.1126/science.aaf6793

    2016 doi

  17. [25]

    Tengdin P, You W, Chen C, Shi X, Zusin D, Zhang Y, Gentry C, Blonsky A, Keller M, Oppeneer PM, Kapteyn HC, Tao Z, Murnane MM, Critical behavior within 20 fs drives the out-of-equilibrium laser-induced magnetic phase transition in nickel, Sci. Adv. 4 (3) (2018) eaap9744. https:...

    2018 doi

  18. [26]

    https://doi.org/10.1126/science.aaa1394

    Miao J, Ishikawa T, Robinson IK, Murnane MM, Beyond crystallography: Diffractive imaging using coherent x-ray light sources, Science 348 (6234) (2015) 530–535. https://doi.org/10.1126/science.aaa1394

    2015 doi

  19. [27]

    Shi X, Liao CT, Tao Z, Cating-Subramanian E, Murnane MM, Hernández-García C, Kapteyn HC, Attosecond light science and its application for probing quantum materials, J. Phys. B: At. Mol. Opt. Phys . 53 (18) (2020) 184008. https://doi.org/10.1088/1361-6455/aba2fb

    2020 doi

  20. [28]

    Midorikawa K, Progress on table-top isolated attosecond light sources, Nat. Photon. 16 (4) (2022) 267–278. https://doi.org/10.1038/s41566-022-00961-9

    2022 doi

  21. [29]

    Salieres P, L’Huillier A, Lewenstein M, Coherence Control of High-Order Harmonics, Phys. Rev. Lett. 74, 3776. (1995). https://doi.org/10.1103/PhysRevLett.74.3776

    1995 doi

  22. [30]

    Phase-Matched Generation of Coherent Soft X-rays

    Rundquist A, Durfee CG, Chang Z, Herne C, Backus S, Murnane MM, Kapteyn HC. Phase-Matched Generation of Coherent Soft X-rays. Science 280,1412-1415(1998). https://doi.org/10.1126/science.280.5368.1412

    1998

  23. [31]

    Macroscopic aspects of attosecond pulse generation

    Gaarde MB, Tate JL, Schafer KJ. Macroscopic aspects of attosecond pulse generation. J. Phys. B: At. Mol. Opt. Phys. 41 132001 (2008). https://doi.org/10.1088/0953-4075/41/13/132001

    2008 doi

  24. [32]

    Popmintchev T, Chen MC, Arpin P, Murnane MM, Kapteyn HC, The attosecond nonlinear optics of bright coherent X- ray generation, Nat. Photon. 4, 822 (2010) https://doi.org/10.1038/nphoton.2010.256

    2010 doi

  25. [33]

    Fu Z, Chen Y, Peng S, Zhu B, Li B, Martín-Hernández R, Fan G, Wang Y, Hernández-García C, Jin C, Murname MM, Kapteyn HC, Tao Z, Extension of the bright high-harmonic photon energy range via nonadiabatic critical phase matching. Sci. Adv.8,eadd7482(2022). https://doi.org/10.112...

    2022 doi

  26. [34]

    Nat Rev Phys 4, 713–722 (2022)

    Weissenbilder R, Carlström S, Rego L, Guo C, Heyl CM, Smorenburg P, Constant E, Arnold CL, L’huillier A, How to optimize high-order harmonic generation in gases. Nat Rev Phys 4, 713–722 (2022). https://doi.org/10.1038/s42254- 022-00522-7

    2022 doi

  27. [35]

    Generalized phase-matching conditions for high harmonics: The role of field-gradient forces

    Balcou P, Salieres P, L'Huillier A, Lewenstein M. Generalized phase-matching conditions for high harmonics: The role of field-gradient forces. Phys. Rev. A 55(4), 3204. (1997). https://doi.org/10.1103/PhysRevA.55.3204

    1997 doi

  28. [36]

    Ideal waveform to generate the maximum possible electron recollision energy for any given oscillation period

    Chipperfield LE, Robinson JS, Tisch JWG, Marangos JP. Ideal waveform to generate the maximum possible electron recollision energy for any given oscillation period. Phys Rev Lett. 102, 063003 (2009). https://doi.org/10.1103/PhysRevLett.102.063003

    2009 doi

  29. [37]

    Johnson AS, Austin DR, Wood DA, Brahms C, Gregory A, Holzner KB, Jarosch S, Larsen EW, Parker S, Strber CS, Ye P, Tisch JWG, Marangos J, High-flux soft x-ray harmonic generation from ionization-shaped few-cycle laser pulses. Sci. Adv.4,eaar3761(2018). https://doi.org/10.1126/s...

    2018 doi

  30. [38]

    Coherent water window x ray by phasematched high-order harmonic generation in neutral media

    Takahashi EJ, Kanai T, Ishikawa KL, Nabekawa Y, Midorikawa K. Coherent water window x ray by phasematched high-order harmonic generation in neutral media. Phys Rev Lett. 101, 253901 (2008). https://doi.org/10.1103/PhysRevLett.101.253901

    2008 doi

  31. [39]

    High-flux table-top soft x-ray source driven by sub-2-cycle, CEP stable, 1.85-μm 1-kHz pulses for carbon K-edge spectroscopy, Opt

    Cousin SL, Silva F, Teichmann S, Hemmer M, Buades B, Biegert J. High-flux table-top soft x-ray source driven by sub-2-cycle, CEP stable, 1.85-μm 1-kHz pulses for carbon K-edge spectroscopy, Opt. Lett. 39 (18), 5383-5386 (2014). https://doi.org/10.1364/OL.39.005383 J.M. Pablos-...

    2014 doi

  32. [40]

    Spatiotemporal coupling of attosecond pulses

    Wikmark H, Guo C, Vogelsang J, Smorenburg PW, Coudert-Alteirac H, Lah J, Pesche J, Rudawski P, Dacasa H, Carlström S, Maclot S, Gaarde MB, Johnsson P, Arnold CL, L'Huillier A. Spatiotemporal coupling of attosecond pulses. Proc. Natl. Acad. Sci. 116.11 4779-4787 (2019). https:/...

    2019 doi

  33. [41]

    Quintard L, Strelkov V, Vabek J, Hort O, Dubrouil A, Descamps D, Burgy F, Péjot C, Mével E, Catoire F, Constant E, Optics-less focusing of XUV high-order harmonics. Sci. Adv.5,eaau7175(2019). https://www.science.org/doi/abs/10.1126/sciadv.aau7175

    2019 doi

  34. [42]

    Rego L, Brooks NJ, Nguyen QLD, Román JS, Binnie I, Plaja L, Kapteyn HC, Murnane MM, Hernández- García C, Necklace-structured high-harmonic generation for low-divergence, soft x-ray harmonic combs with tunable line spacing, Sci. Adv. 8 (5) (2022) eabj7380. https://www.science.o...

    2022 doi

  35. [43]

    APL Photonics 10, 060801 (2025) https://doi.org/10.1063/5.0255843

    Schmidt DD, Pablos-Marín JM, Clarke C, Barolak J, Westlake N, de las Heras A, Serrano J, Shevtsov S, Kazansky P, Adams D, Hernández-García C, Durfee CG, Self-interfering high harmonic beam arrays driven by Hermite–Gaussian beams. APL Photonics 10, 060801 (2025) https://doi.org...

    2025 doi

  36. [44]

    Chen M, Mancuso C, Hernández-García C, Dollar F, Galloway B, Popmintchev D, Huang P, Walker B, Plaja L, Jaroń- Becker AA, Becker A, Murnane MM, Kapteyn HC, Popmintchev T, Generation of bright isolated attosecond soft X-ray pulses driven by multicycle midinfrared lasers, Proc. ...

    2014 doi

  37. [45]

    Isolated attosecond pulse generation in a semi-infinite gas cell driven by time-gated phase matching

    Vismarra F, Fernández-Galán M, Mocci D, Colaizzi L, Segundo VW, Boyero-García R, Serrano J, Conejero-Jarque E, Pini M, Mai L, Wu Y, Wörner HJ, Appi E, Arnold CL, Reduzzi M, Luchini M, Román JS, Nisoli M, Hernánde z-García C, Borrego-Varillas R . Isolated attosecond pulse gener...

    2024 doi

  38. [46]

    https://doi.org/10.48550/arXiv.2412.06339

    Chien YE, Fernández-Galán M, Tsai MS, Liang AY, Conejero-Jarque E, Serrano J, San Román J, Hernández-García C, Chen MC, Filamentation-Assisted Isolated Attosecond Pulse Generation, arXiv:2412.06339 (2024). https://doi.org/10.48550/arXiv.2412.06339

    2024 doi arXiv

  39. [47]

    Hernández-García C, Picón A, San Román J, Plaja L, Attosecond Extreme Ultraviolet Vortices from High-Order Harmonic Generation, Phys. Rev. Lett. 111, 083602 (2013). https://doi.org/10.1103/PhysRevLett.111.083602

    2013 doi

  40. [48]

    https://doi.org/10.1364/optica.4.000520

    Hernández-García C, Turpin A, San Román J, Picón A, Drevinskas R, Cerkauskaite A, Kazansky PG, Durfee CG, Sola IJ, Extreme ultraviolet vector beams driven by infrared lasers, Optica 4, 520 (2017). https://doi.org/10.1364/optica.4.000520

    2017 doi

  41. [49]

    https://doi.org/10.1126/science.aaw9486

    Rego L, Dorney KM, Brooks NJ, Nguyen QL, Liao CT, Román JS, Couch DE, Liu A, Pisanty E, Lewenstein M, Plaja L, Kapteyn HC, Murnane MM, Generation of extreme-ultraviolet beams with time-varying orbital angular momentum, Science 364 (2019). https://doi.org/10.1126/science.aaw9486

    2019 doi

  42. [50]

    Martín-Hernández R, Gui G, Plaja L, Kapteyn HC, Murnane MM, Liao CT, Porras MA, Hernández-García C, Extreme- ultraviolet spatiotemporal vortices via high harmonic generation. Nat. Photon. (2025). https://doi.org/10.1038/s41566- 025-01699-w

    2025 doi

  43. [51]

    Long S, Becker W, McIver JK, Model calculations of polarization-dependent two-color high-harmonic generation, Phys. Rev. A 52, 2262 (1995). https://doi.org/10.1103/PhysRevA.52.2262

    1995 doi

  44. [52]

    Fleischer A, Kfir O, Diskin T, Sidorenko P, Cohen O, Spin angular momentum and tunable polarization in high- harmonic generation, Nat. Photon. 8, 543–549 (2014). https://doi.org/10.1038/nphoton.2014.108

    2014 doi

  45. [53]

    Hickstein DD, Dollar FJ, Grychtol P, Ellis JL, Knut R, Hernández- García C, Zusin D, Gentry C, Shaw JM, Fan T, Dorney KM, Becker A, Jarón-Becker A, Kapteyn HC, Murnane MM, Durfee CG, Non-collinear generation of angularly isolated circularly polarized high harmonics, Nat. Photo...

    2015 doi

  46. [54]

    Huang PC, Hernández-García C, Huang JT, Huang PY, Lu CH, Rego L, Hickstein DD, Ellis JL, Jaron-Becker A, Becker A, Yang SD, Durfee CG, Plaja L, Kapteyn HC, Murnane MM, Kung AH, Chen MC, Polarization control of isolated high-harmonic pulses, Nat. Photon. 12, 349–354 (2018). htt...

    2018 doi

  47. [55]

    https://doi.org/10.1364/OPTICA.413531

    Chang KY, Huang LC, Asaga K, Tsai MS, Rego L, Huang PC, Mashiko H, Oguri K, Hernández-García C, Chen MC, High-order nonlinear dipole response characterized by extreme ultraviolet ellipsometry, Optica 8, 484-492 (2021). https://doi.org/10.1364/OPTICA.413531

    2021 doi

  48. [56]

    Kanai T, Takahashi EJ, Nabekawa Y, Midorikawa K, Destructive Interference during High Harmonic Generation in Mixed Gases, Phys. Rev. Lett. 98, 153904 (2007), https://doi.org/10.1103/PhysRevLett.98.153904

    2007 doi

  49. [57]

    Wang L, Zhu W, Li H, Zhang Y, Spectrum modification of high-order harmonic generation in a gas mixture of Ar and Kr, J. Opt. Soc. Am. B 35, A39-A44 (2018), https://doi.org/10.1364/JOSAB.35.000A39

    2018 doi

  50. [58]

    Wagner N, Zhou X, Lock R, Li W, Wüest A, Murnane M, Kapteyn H, Extracting the phase of high-order harmonic emission from a molecule using transient alignment in mixed samples, Phys. Rev. A 76, 061403(R) (2007), https://doi.org/10.1103/PhysRevA.76.061403 J.M. Pablos-Marín et al...

    2007 doi

  51. [59]

    Kanai T, Takahashi EJ, Nabekawa Y, Midorikawa K, Observing molecular structures by using high-order harmonic generation in mixed gases, Phys. Rev. A 77, 041402(R) (2008), https://doi.org/10.1103/PhysRevA.77.041402

    2008 doi

  52. [60]

    Zhai C, Zhu X, Long J, Shao R, Zhang Y, He L, Tang Q, Li Y, Lan P, Yu B, Lu P, Generation of elliptically polarized attosecond pulses in mixed gases, Phys. Rev. A 103, 033114 (2021). https://doi.org/10.1103/PhysRevA.103.033114

    2021 doi

  53. [61]

    Zhai C, Zhu X, Li Y, Tang Q, Yu B, Lan P and Lu P, Helicity-selected near-circularly polarized attosecond pulses generated from mixed He-Ne gases, Phys. Rev. A 111, 043519 (2025). https://doi.org/10.1103/PhysRevA.111.043519

    2025 doi

  54. [62]

    Sayrac M, Kolomenskii AA, Strohaber J, Schuessler HA, High harmonic generation in Ne and H2 gas mixtures, J. Opt. Soc. Am. B 32, 2400-2405 (2015) https://doi.org/10.1364/JOSAB.32.002400

    2015 doi

  55. [63]

    Pablos-Marín JM, Serrano J, Hernández-García C, Simulating macroscopic high-order harmonic generation driven by structured laser beams using artificial intelligence, Comput. Phys. Commun. 291, 108823 (2023). https://doi.org/10.1016/j.cpc.2023.108823

    2023

  56. [64]

    Hernández-García C, Pérez-Hernández J, Ramos J, Jarque EC, Roso L, Plaja L, High-order harmonic propagation in gases within the discrete dipole approximation, Phys. Rev. A 82 (3) 033432 (2010). https://doi.org/10.1103/PhysRevA.82.033432

    2010 doi

  57. [65]

    Chollet F, Deep learning with Python (Simon and Schuster, 2021)

    2021

  58. [66]

    Hernández-García C, Román JS, Plaja L, Picón A, Quantum-path signatures in attosecond helical beams driven by optical vortices, New J. Phys. 17 (9) (2015) 093029. https://iopscience.iop.org/article/10.1088/1367-2630/17/9/093029

    2015 doi

  59. [67]

    Rego L, San Román J, Picón A, Plaja L, Hernández-García C, Nonperturbative twist in the generation of extreme- ultraviolet vortex beams, Phys. Rev. Lett. 117 (16) (2016) 163202. https://doi.org/10.1103/PhysRevLett.117.163202

    2016 doi

  60. [68]

    Vincenti H, Quéré F, Attosecond lighthouses: How to use spatiotemporally coupled light fields to generate isolated attosecond pulses, Phys. Rev. Lett. 108, 113904 (2012). https://doi.org/10.1103/PhysRevLett.108.113904

    2012 doi

  61. [69]

    Li J, Ren X, Yin Y, Zhao K, Chew A, Cheng Y, Cunningham E, Wang Y, Hu S, Wu Y, Chini M Chang Z, 53- attosecond X-ray pulses reach the carbon K-edge. Nat. Comm. 8, 186 (2017). https://doi.org/10.1038/s41467-017- 00321-0

    2017 doi

  62. [70]

    Streaking of 43-attosecond soft-x-ray pulses generated by a passively cep-stable midinfrared driver

    Gaumnitz T, Jain A, Pertot Y, Huppert M, Jordan I, Ardana-Lamas F, Wörner HJ. Streaking of 43-attosecond soft-x-ray pulses generated by a passively cep-stable midinfrared driver. Opt Express. 2017;25(22): 27506–27518. https://doi.org/10.1364/OE.25.027506

    2017 doi

  63. [71]

    https://doi.org/10.1364/OPTICA.5.000479

    Ellis JL, Dorney KM, Hickstein DD, Brooks NJ, Gentry C, Hernández-García C, Zusin D, Shaw JM, Nguyen QL, Mancuso CA, Jansen GSM, Witte S, Kapteyn HC, and Murnane MM, High harmonics with spatially varying ellipticity, Optica 5, 479-485 (2018). https://doi.org/10.1364/OPTICA.5.000479

    2018 doi

  64. [72]

    Azoury D, Kneller O, Krüger M, Bruner BD, Cohen O, Mairesse Y, Dudovich N, Interferometric attosecond lock-in measurement of extreme-ultraviolet circular dichroism. Nat. Photon. 13, 198–204 (2019). https://doi.org/10.1038/s41566-019-0350-5

    2019 doi

  65. [73]

    Popmintchev T, Chen M, Bahabad A, Gerrity M, Sidorenko P, Cohen O, Christov IP, Murnane MM, Kapteyn HC, Phase matching of high harmonic generation in the soft and hard X -ray regions of the spectrum, Proc. Natl. Acad. Sci. U.S.A. 106 (26) 10516-10521 (2009). https://doi.org/10...

    2009 doi

Pith tools

Reviewed August 6, 2026 · model on record in the stance chip above.