Chirp-controlled high-harmonic and attosecond-pulse generation via coherent-wake plasma emission driven by mid-infrared laser pulses

Mitrofanov, A. V.; Sidorov‐Biryukov, D. A.; Glek, P. B.; Рожко, М. В.; Stepanov, Evgeny A.; Shutov, Anton D.; Ryabchuk, S. V.; Voronin, A. A.; Федотов, А. Б.; Zheltikov, A. M.

doi:10.1364/ol.45.000750

Cited by 18 publications

(10 citation statements)

References 20 publications

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“…Specifically, as can be seen from the comparison of THz yields attainable from laser-plasma sources driven with 0.8- and 3.9-μm laser pulses (green and blue boxes in Fig. 5 a along with the respective Φ( I 0 λ 0 2 ) asymptotes), the use of a 3.9-μm, sub-100-fs output of the latest-generation high-power OPCPAs 37 – 39 , 63 – 65 can significantly enhance THz generation from relativistic laser–plasma settings relative to plasmas driven by standard, 0.8-μm Ti: sapphire laser pulses. Relativistic field intensities have been already achieved for such sources 63 , 64 .…”

Section: Discussionmentioning

confidence: 99%

“…In Fig. 5 a, the THz intensity I THz is plotted as a function of the driver field intensity I 0 for two values of the driver wavelength, representing two types of relativistic-intensity short-pulse laser sources—Ti: sapphire lasers, λ 0 = 0.8 μm 61 , 62 , and high-peak-power mid-infrared OPCPAs, λ 0 = 3.9 μm 63 – 65 . Simulations here are performed for a laser driver with a pulse width τ 0 = 80 fs and a beam-waist diameter d 0 = 4 λ 0 .…”

Section: The I 0 λ ...mentioning

confidence: 99%

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Enhanced coherent transition radiation from midinfrared-laser-driven microplasmas

Glek

Zheltikov

2022

Sci Rep

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We present a particle-in-cell (PIC) analysis of terahertz (THz) radiation by ultrafast plasma currents driven by relativistic-intensity laser pulses. We show that, while the I0$${\lambda }_{0}^{2}$$ λ 0 2 product of the laser intensity I0 and the laser wavelength λ0 plays the key role in the energy scaling of strong-field laser-plasma THz generation, the THz output energy, WTHz, does not follow the I0$${\lambda }_{0}^{2}$$ λ 0 2 scaling. Its behavior as a function of I0 and λ0 is instead much more complex. Our two- and three-dimensional PIC analysis shows that, for moderate, subrelativistic and weakly relativistic fields, WTHz(I0$${\lambda }_{0}^{2}$$ λ 0 2 ) can be approximated as (I0λ02)α, with a suitable exponent α, as a clear signature of vacuum electron acceleration as a predominant physical mechanism whereby the energy of the laser driver is transferred to THz radiation. For strongly relativistic laser fields, on the other hand, WTHz(I0$${\lambda }_{0}^{2}$$ λ 0 2 ) closely follows the scaling dictated by the relativistic electron laser ponderomotive potential $${\mathscr{F}}_{{\text{e}}}$$ F e , converging to WTHz ∝ $${I}_{0}^{1/2}{\lambda }_{0}$$ I 0 1 / 2 λ 0 for very high I0, thus indicating the decisive role of relativistic ponderomotive charge acceleration as a mechanism behind laser-to-THz energy conversion. Analysis of the electron distribution function shows that the temperature Te of hot laser-driven electrons bouncing back and forth between the plasma boundaries displays the same behavior as a function of I0 and λ0, altering its scaling from (I0λ02)α to that of $${\mathscr{F}}_{{\text{e}}}$$ F e , converging to WTHz ∝ $${I}_{0}^{1/2}{\lambda }_{0}$$ I 0 1 / 2 λ 0 for very high I0. These findings provide a clear physical picture of THz generation in relativistic and subrelativistic laser plasmas, suggesting the THz yield WTHz resolved as a function of I0 and λ0 as a meaningful measurable that can serve as a probe for the temperature Te of hot electrons in a vast class of laser–plasma interactions. Specifically, the α exponent of the best (I0λ02)α fit of the THz yield suggests a meaningful probe that can help identify the dominant physical mechanisms whereby the energy of the laser field is converted to the energy of plasma electrons.

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Section: Discussionmentioning

confidence: 99%

Section: The I 0 λ ...mentioning

confidence: 99%

Enhanced coherent transition radiation from midinfrared-laser-driven microplasmas

Glek

Zheltikov

2022

Sci Rep

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“…The intensity dependence of the Brunel trajectories leads to increasing delays between successive attosecond pulses under the driving pulse envelope and thus to frequencybroadened negatively chirped individual CWE harmonics [33,36]. A positively chirped driving pulse can partially compensate the effect and consequently lead to spectrally narrower CWE harmonics [33,37,38]. In contrast, for moderate a 0 ~1, the relativistic SHHG emission is Fourier-limited [4,17] such that despite its much steeper intensity dependence and consequently shorter temporal envelope, its harmonic spectral width is narrower than that of CWE harmonics generated in the same conditions [4,20,39].…”

Section: (I) Intensity Dependencementioning

confidence: 99%

High-Harmonic Generation and Correlated Electron Emission from Relativistic Plasma Mirrors at 1 kHz Repetition Rate

et al. 2022

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We report evidence for the first generation of XUV spectra from relativistic surface high-harmonic generation (SHHG) on plasma mirrors at a kilohertz repetition rate, emitted simultaneously with energetic electrons. SHHG spectra and electron angular distributions are measured as a function of the experimentally controlled plasma density gradient scale length Lg for three increasingly short and intense driving pulses: 24 fs and a0=1.1, 8 fs and a0=1.6, and finally 4 fs and a0≈2.1, where a0 is the peak vector potential normalized by mec/e with the elementary charge e, the electron rest mass me, and the vacuum light velocity c. For all driver pulses, we observe correlated relativistic SHHG and electron emission in the range Lg∈λ/20,λ/4, with an optimum gradient scale length of Lg≈λ/10. This universal optimal Lg-range is rationalized by deriving a direct intensity-independent link between the scale length Lg and an effective similarity parameter for relativistic laser-plasma interactions.

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“…The rapid development of the technique for generating short laser pulses with given parameters, including a frequency chirp [1], necessitates the development of adequate methods for the theoretical description of photo-processes in the field of such pulses with prescribed parameters. Along with the amplitude, carrier frequency, and pulse duration, an important parameter is the frequency chirp of the pulse.…”

Section: Introductionmentioning

confidence: 99%

Chirped Laser Pulse Effect on a Quantum Linear Oscillator

Astapenko

Sakhno

2020

Symmetry

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We present a theoretical study of the excitation of a charged quantum linear oscillator by chirped laser pulse with the use of probability of the process throughout the pulse action. We focus on the case of the excitation of the oscillator from the ground state without relaxation. Calculations were made for an arbitrary value of the electric field strength by utilizing the exact expression for the excitation probability. The dependence of the excitation probability on the pulse parameters was analyzed both numerically and by using analytical formulas.

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Chirp-controlled high-harmonic and attosecond-pulse generation via coherent-wake plasma emission driven by mid-infrared laser pulses

Cited by 18 publications

References 20 publications

Enhanced coherent transition radiation from midinfrared-laser-driven microplasmas

Enhanced coherent transition radiation from midinfrared-laser-driven microplasmas

High-Harmonic Generation and Correlated Electron Emission from Relativistic Plasma Mirrors at 1 kHz Repetition Rate

Chirped Laser Pulse Effect on a Quantum Linear Oscillator

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