Sawtooth grating-assisted phase-matching

Sidorenko, Pavel; Kozlov, Maxim; Bahabad, Alon; Popmintchev, Tenio; Murnane, Margaret M.; Kapteyn, Henry C.; Cohen, Oren

doi:10.1364/oe.18.022686

Cited by 13 publications

(11 citation statements)

References 22 publications

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“…There are currently several typical QPM techniques relying either on periodic modulation of the generating field strength: propagation in diameter-modulated capillaries [5]; HHG assisted by a periodic static electric field (or other periodic waveform e.g. sawtooth) [6,7]; QPM induced using two counterpropagating pulses [8,9]; QPM through multi-mode excitation in a waveguide [10]. An alternative QPM arrangement relies on periodic off-switching of generation in a multi-jet configuration [11,12].…”

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confidence: 99%

Quasi-Phase-Matching High-Harmonic Radiation Using Chirped THz Pulses

et al. 2012

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High-order harmonic generation in the presence of a chirped THz pulse is investigated numerically with a complete 3D nonadiabatic model. The assisting THz pulse illuminates the high-order harmonic generation gas cell laterally inducing quasi-phase-matching. We demonstrate that it is possible to compensate the phase mismatch during propagation and extend the macroscopic cutoff of a propagated strong IR pulse to the single-dipole cutoff. We obtain 2 orders of magnitude increase in the harmonic efficiency of cutoff harmonics (≈170 eV) using a THz pulse of constant wavelength, and a further factor of 3 enhancement when a chirped THz pulse is used.

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confidence: 99%

Quasi-Phase-Matching High-Harmonic Radiation Using Chirped THz Pulses

et al. 2012

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“…In theory, perfect elimination of the PMM can be obtained, if a sawtooth-shaped field is applied as proposed in [44]. Therefore, this in not a traditional QPM method, we mention it due to the fact that it also uses an assisting field and, in theory, this can achieve 100% efficiency.…”

Section: Sawtooth-shaped Fieldsmentioning

confidence: 99%

Field strength scaling in quasi-phase-matching of high-order harmonic generation by low-intensity assisting fields

Balogh

Varjú

2016

J. Opt. Soc. Am. B

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High-order harmonic generation in gas targets is a widespread scheme used to produce extreme ultraviolet radiation, however, it has a limited microscopic efficiency. Macroscopic enhancement of the produced radiation relies on phase-matching, often only achievable in quasi-phase-matching arrangements. In the present work we numerically study quasi-phase-matching induced by lowintensity assisting fields. We investigate the required assisting field strength dependence on the wavelength and intensity of the driving field, harmonic order, trajectory class and period of the assisting field. We comment on the optimal spatial beam profile of the assisting field.

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“…The ELI-ALPS pan-European research infrastructure is also based on HHG sources [4], demonstrating that the increasing research efforts dedicated to this field are fully justified. Given the advantages of exploring HHG in the emerging field of Attosecond Science and Technology, considerable research effort is being dedicated to find ways for increasing high-harmonic efficiency by implementing either tight [5] or loose focusing configurations [4,6], inventing different quasi-phase-matching techniques [7][8][9][10][11][12][13][14], multi-color and/or multi-jet configurations [12,[15][16][17], but also to extend the available photon energy to reach the water-window [17][18][19] region.…”

Section: Introductionmentioning

confidence: 99%

Artificial Neural Network Trained to Predict High-Harmonic Flux

et al. 2018

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In this work we present the results obtained with an artificial neural network (ANN) which we trained to predict the expected output of high-order harmonic generation (HHG) process, while exploring a multi-dimensional parameter space. We argue on the utility and efficiency of the ANN model and demonstrate its ability to predict the outcome of HHG simulations. In this case study we present the results for a loose focusing HHG beamline, where the changing parameters are: the laser pulse energy, gas pressure, gas cell position relative to focus and medium length. The physical quantity which we predict here using ANN is directly related to the total harmonic yield in a specified spectral domain (20–40 eV). We discuss the versatility and adaptability of the presented method.

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Sawtooth grating-assisted phase-matching

Cited by 13 publications

References 22 publications

Quasi-Phase-Matching High-Harmonic Radiation Using Chirped THz Pulses

Quasi-Phase-Matching High-Harmonic Radiation Using Chirped THz Pulses

Field strength scaling in quasi-phase-matching of high-order harmonic generation by low-intensity assisting fields

Artificial Neural Network Trained to Predict High-Harmonic Flux

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