Absolute Gas Density Profiling In High Order Harmonic Generation

Comby, Antoine; Beaulieu, Samuel; Constant, Éric; Descamps, D.; Petit, S.; Mairesse, Y.

doi:10.1364/hilas.2018.hw2a.5

Cited by 5 publications

(7 citation statements)

References 31 publications

(43 reference statements)

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“…The nozzle of the gas jet is 250 µm in diameter leading to a 0.8 mm medium length in the laser interaction region.The back pressure of krypton gas was around 3 bars. The medium length and the pressure in the interaction zone were estimated to 100 − 150 mbar with a gas density measurement technique similar to [50].…”

Section: Methodsmentioning

confidence: 99%

High-order parametric generation of coherent XUV radiation

Hort,

Dubrouil,

Khokhlova

et al. 2020

Preprint

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We observe a new regime of coherent XUV radiation generation in noble gases induced by femtosecond pulses at very high intensities. This XUV emission has both a reduced divergence and spectral width as compared to high-order harmonic generation (HHG). It is not emitted at a moderate intensity of the driving pulses where only high-order harmonics are generated. At high driving intensities, the additional XUV comb appears near all harmonic orders and even exceeds the HHG signal on the axis. The peaks are observed in several gases and their frequencies do not depend on the driving intensity or gas pressure. We analyze the divergence, spectral width and spectral shift of this XUV emission. We show that these specific features are well explained by high-order parametric generation (HPG) involving multiphoton absorption and combined emission of an idler THz radiation and an XUV beam with remarkably smooth spatial and spectral characteristics.

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Section: Methodsmentioning

confidence: 99%

High-order parametric generation of coherent XUV radiation

Hort,

Dubrouil,

Khokhlova

et al. 2020

Preprint

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“…A CCD camera monitors the plasma produced during the high-order harmonic generation process, enabling us to retrieve the absolute density profile of the gas jet [36,37]. The plasma light emission is calibrated by filling in the chamber with a static pressure of argon, and measuring the plasma light intensity as a function of gas density.…”

Section: Overview Of the Beamlinementioning

confidence: 99%

Bright, polarization-tunable high repetition rate extreme ultraviolet beamline for coincidence electron-ion imaging

Comby,

Bloch,

Beauvarlet

et al. 2020

Preprint

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After decades of supremacy of the Titanium:Sapphire technology, Ytterbium-based high-order harmonic sources are emerging as an interesting alternative for experiments requiring high flux of ultrashort extreme ultraviolet (XUV) radiation. In this article we describe a versatile experimental setup delivering XUV photons in the 10-50 eV range. The use of cascaded high-harmonic generation enables us to reach 1.8 mW of average power at 18 eV. Several spectral focusing schemes are presented, to select either a single harmonic or group of high-harmonics and thus an attosecond pulse train. In the perspective of circular dichroism experiments, we produce highly elliptical XUV radiation using resonant elliptical high-harmonic generation, and circularly polarized XUV by bichromatic bicircular high-harmonic generation. As a proof of principle experiment, we focus the XUV beam in a coincidence electron-ion imaging spectrometer, where we measure the photoelectron momentum angular distributions of xenon monomers and dimers.

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“…In the future, additional methods can be used to estimate the laser beam size at the interaction point. The method recently proposed by Comby and co-authors [110] allows for the determination of the absolute density profile of a gas jet used for HHG by measuring the brightness profile of the generated plasma. As an intermediate step, the authors disentangled the contributions of the laser beam profile evolution from the gas jet itself by measuring the profile of the created plasma with a constant argon pressure in the chamber.…”

Section: Tight-focus Extensionmentioning

confidence: 99%

XUV Sources Based on Intra-Oscillator High Harmonic Generation With Thin-Disk Lasers: Current Status and Prospects

Labaye

Gaponenko

Modsching

et al. 2019

IEEE J. Select. Topics Quantum Electron.

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Ultrafast thin-disk laser (TDL) oscillators provide higher intracavity pulse energy, average power, and peak power levels than any other femtosecond laser oscillator technology. They are suitable for driving extreme nonlinear interactions directly inside the laser oscillator. High harmonic generation (HHG) driven inside ultrafast TDL oscillators is a very recent approach for the generation of coherent extreme ultraviolet (XUV) light at multimegahertz repetition rates. In this paper, we review the current state of the development, discuss the technological potential, and give an outlook toward the future developments. We compare the current performance to established technologies and evaluate possible limitations. We discuss future improvements, such as reduction of the driving pulse duration and increase of the intracavity peak power, efficient extraction of the XUV light from the cavity, and carrier-envelope offset frequency stabilization of the generated XUV light. Due to the power scalability of the TDL concept and the possibility to operate in a spectrally broadened regime with pulse durations below the gain bandwidth limitation, intra-oscillator HHG with TDLs has a high potential for powerful table-top multi-megahertz coherent XUV light sources for science and applications.

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Absolute Gas Density Profiling In High Order Harmonic Generation

Cited by 5 publications

References 31 publications

High-order parametric generation of coherent XUV radiation

High-order parametric generation of coherent XUV radiation

Bright, polarization-tunable high repetition rate extreme ultraviolet beamline for coincidence electron-ion imaging

XUV Sources Based on Intra-Oscillator High Harmonic Generation With Thin-Disk Lasers: Current Status and Prospects

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