Phase matching of noncollinear sum and difference frequency high harmonic generation above and below the critical ionization level

Ellis, Jennifer L.; Dorney, Kevin M.; Durfee, Charles G.; Hernández-García, Carlos; Dollar, F.; Mancuso, Christopher; Fan, Ting-Jun; Zusin, Dmitriy; Gentry, Christian; Grychtol, Patrik; Kapteyn, Henry C.; Murnane, Margaret M.; Hickstein, Daniel D.

doi:10.1364/oe.25.010126

Cited by 19 publications

(14 citation statements)

References 61 publications

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“…orders with opposite helicity (i.e., left-circular, LCP, or right-circular polarization, RCP) [25][26][27][28][29][30][31][32][33][34][35][36]. Moreover, the driving laser field parameters determine the spectral, temporal, and polarization properties of CPHHG, enabling the creation of tailored CPHHG waveforms.…”

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confidence: 99%

Helicity-Selective Enhancement and Polarization Control of Attosecond High Harmonic Waveforms Driven by Bichromatic Circularly Polarized Laser Fields

Dorney¹,

Ellis²,

Hernández-García³

et al. 2017

Phys. Rev. Lett.

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119

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High harmonics driven by two-color counterrotating circularly polarized laser fields are a unique source of bright, circularly polarized, extreme ultraviolet, and soft x-ray beams, where the individual harmonics themselves are completely circularly polarized. Here, we demonstrate the ability to preferentially select either the right or left circularly polarized harmonics simply by adjusting the relative intensity ratio of the bichromatic circularly polarized driving laser field. In the frequency domain, this significantly enhances the harmonic orders that rotate in the same direction as the higher-intensity driving laser. In the time domain, this helicity-dependent enhancement corresponds to control over the polarization of the resulting attosecond waveforms. This helicity control enables the generation of circularly polarized high harmonics with a user-defined polarization of the underlying attosecond bursts. In the future, this technique should allow for the production of bright highly elliptical harmonic supercontinua as well as the generation of isolated elliptically polarized attosecond pulses.

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mentioning

confidence: 99%

Helicity-Selective Enhancement and Polarization Control of Attosecond High Harmonic Waveforms Driven by Bichromatic Circularly Polarized Laser Fields

Dorney¹,

Ellis²,

Hernández-García³

et al. 2017

Phys. Rev. Lett.

Self Cite

119

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“…31. A geometric additional wave vector was identified, and made responsible for the experimental observation that either DFG or SFG may dominate, depending on the focusing parameters [31] or ionization [44]. We here argue that this "macroscopic" approach, which disregards the fine structure of the two beam focus, is only an approximation limited to weak perturbations.…”

Section: Structure Of a Two Beam Focusmentioning

confidence: 73%

High-order harmonic generation in an active grating

et al. 2019

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We study theoretically and experimentally High Harmonic Generation (HHG) using two non collinear driving fields focused in gases. We show that these two fields form a non stationary blazed active grating in the generation medium. The intensity and phase structure of this grating rule the far field properties of the emission, such as the relative amplitude of the diffraction orders. Full macroscopic calculations and experiments support this general analysis. This insight into the HHG process allows us to envision new structuration schemes to convert femtosecond lasers to attosecond pulses with increased efficiency.

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“…This non-collinear HHG geometry presents numerous advantages [22,[26][27][28][29] , including the separation of the harmonics from the pump beams, angular separation of different order harmonics, generation of high-energy photons, and production of isolated attosecond bursts. Evidently, this HHG process meets the phase-matching requirement, which stipulates that the output momentum of an nth-order harmonic photon (k n ) is only related to the momentum of the input photons (k 1 and k 2 ) by the momentum conservation principle, k n = n 1 k 1 + n 2 k 2 , where n 1 and n 2 are the numbers of photons absorbed from each of the input beams, and n = n 1 + n 2 [22,23,30] . As far as we know, all this interesting research is based on the gas ionization process, where the laser intensity is generally below 10 16 Figure 1.…”

Section: Introductionmentioning

confidence: 99%

New phase-matching selection rule to generate angularly isolated harmonics

Zhang

Shen

Zhang

et al. 2021

High Pow Laser Sci Eng

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High harmonic generation (HHG) is an ideal probing source. In general, all harmonics are coupled with the corresponding input laser when generated, and for applications, they are separated using additional spectrometers. Herein, we report the angular isolation of relativistic harmonics at a predicted emission angle upon generation and, most importantly, a new phase-matching chain selection rule is derived to generate harmonics. Based on the laser plasma mechanism involving two non-collinear relativistic driving lasers, the nth harmonic carrying the information of both input lasers originates from its adjacent (n – 1)th harmonic coupled with one of the input lasers. Meanwhile, the intensity and emission angle of the generated isolated harmonic are both greatly increased compared with those in the gas scheme. These results are satisfactorily verified by theoretical analysis and three-dimensional particle-in-cell simulations, which have physical significance and are essential for practical applications.

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Phase matching of noncollinear sum and difference frequency high harmonic generation above and below the critical ionization level

Cited by 19 publications

References 61 publications

Helicity-Selective Enhancement and Polarization Control of Attosecond High Harmonic Waveforms Driven by Bichromatic Circularly Polarized Laser Fields

Helicity-Selective Enhancement and Polarization Control of Attosecond High Harmonic Waveforms Driven by Bichromatic Circularly Polarized Laser Fields

High-order harmonic generation in an active grating

New phase-matching selection rule to generate angularly isolated harmonics

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