Direct Observation of Density-Gradient Effects in Harmonic Generation from Plasma Mirrors

Kahaly, Subhendu; Monchocé, S.; Vincenti, Henri; Dzelzainis, T.; Dromey, B.; Zepf, M.; Martin, Ph.; Quéré, F.

doi:10.1103/physrevlett.110.175001

Cited by 141 publications

(146 citation statements)

References 23 publications

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“…It appears that for the lowest energy value, the pre-pulse is at a low enough level as not to form a pre-plasma before the arrival of the main pulse. This suggests that the interaction occurs in a plasma with a relatively steep density gradient similar to the conditions encountered when a double plasma mirror is used to reduce the pre-pulse level [17,19]. In contrast, the observed spectral structure of the harmonics for the intermediate and maximum energies appears to be a signature of the interaction taking place in a preformed plasma of increasing scalelength.…”

Section: Resultsmentioning

confidence: 58%

“…This is attributed to the laser pulse characteristics that determine to a great extent the steepness of the density ramp at the plasma-vacuum interface. As has been already reported [19,27,29], the initial density gradient scalelength L has a profound influence on the spectral and spatial properties of the harmonic emission. In our experiment, we were able to observe "beaming" of the harmonic emission and a reproducible spectrum, only when we attenuated the laser beam energy to the level that the pre-pulse effects were switchedoff.…”

Section: Introductionmentioning

confidence: 72%

“…Under ideal conditions regarding the laser pulse characteristics, the ROM mechanism prevails when a L is larger than unity, while for a L 1, the CWE mechanism is considerably more efficient. In the transitional range, the two processes can coexist and which one of the two dominates depends sensitively on the gradient of the plasma density profile [18,19]. Due to its superior properties and predominance at high intensities, the basis for the generation of single attosecond light pulses [20] using this source will most probably be the ROM mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…The solid angle of the emission in these reports was mostly estimated without concurrent determination of the actual emission cone. More recent work has addressed the issues of divergence and XUV efficiency and their dependence on the initial density scalelength prevailing at the plasma-vacuum interface [19,27,28].…”

Section: Introductionmentioning

confidence: 99%

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Multi-μJ harmonic emission energy from laser-driven plasma

et al. 2014

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Section: Resultsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-μJ harmonic emission energy from laser-driven plasma

et al. 2014

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“…However, the peak laser intensity when the PM is used in the experiment is W cm with corresponding a , which is beyond the relativistic intensity threshold. Second, it is verified both by numerical simulations [17,24] and experiments [25,26] that there is an optimum plasma scale length range L for the CWE or the ROM harmonic generation. When the plasma density is steplike L~0, both the CWE and the ROM could not be efficiently excited.…”

mentioning

confidence: 91%

Influence of laser contrast on high-order harmonic generation from solid-density plasma surfaces

Gao¹,

Liu²,

Ge³

et al. 2017

中国光学快报

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This version is available at https://strathprints.strath.ac.uk/62716/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output.Influence of laser contrast on high-order harmonic generation from solid-density plasma surfaces The influence of the laser temporal contrast on the high-order harmonic generation from intense laser interactions with solid-density plasma surfaces is experimentally studied. A switchable plasma mirror system is set up to improve the contrast by two orders of magnitude at 10 ps prior to the main peak. By using the plasma mirror and tuning the prepulse, the dependence of HOHG on laser contrast is investigated. Harmonics up to the 21 st order via the mechanism of coherent wake emission are observed only when the targets are irradiated by high contrast laser pulses by applying the plasma mirror.

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In‐Band Noise Filtering via Spatio‐Spectral Coupling

Wang

Yuan

et al. 2018

Laser & Photonics Reviews

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Noise is a fundamental and ubiquitous problem in optics, and only those out of the signal bandwidth can be filtrated away by traditional spectral filters. This paper presents an in‐band noise filtering scheme where the ultrafast signal is controlled by spatio‐spectral coupling such that the signal and its in‐band noise can be separated in the spatio‐spectral domain. As an example of its impact on ultra‐intense lasers, this filter is applied to show that the noise produced in chirped‐pulse amplification can be efficiently filtrated within the signal bandwidth. Near‐noiseless amplification of pulses with contrast as high as 1011 is demonstrated in a high‐gain optical parametric chirped‐pulse amplifier, resulting in approximately 40 times enhancement in output contrast. The simplicity, efficiency, and direct compatibility with existing techniques for short‐pulse generation will make in‐band filtering attractive to a wide range of applications in ultrafast optics and time‐resolved spectroscopy.

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Direct Observation of Density-Gradient Effects in Harmonic Generation from Plasma Mirrors

Cited by 141 publications

References 23 publications

Multi-μJ harmonic emission energy from laser-driven plasma

Multi-μJ harmonic emission energy from laser-driven plasma

Influence of laser contrast on high-order harmonic generation from solid-density plasma surfaces

In‐Band Noise Filtering via Spatio‐Spectral Coupling

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