• High Power Laser Science and Engineering
  • Vol. 9, Issue 1, 010000e6 (2021)
Fabien Quéré* and Henri Vincenti*
Author Affiliations
  • LIDYL, CEA-CNRS, Université Paris-Saclay, 91191Gif-sur-Yvette, France
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    The quantum vacuum plays a central role in physics. Quantum electrodynamics (QED) predicts that the properties of the fermionic quantum vacuum can be probed by extremely large electromagnetic fields. The typical field amplitudes required correspond to the onset of the ‘optical breakdown’ of this vacuum, expected at light intensities >4.7×1029 W/cm2. Approaching this ‘Schwinger limit’ would enable testing of major but still unverified predictions of QED. Yet, the Schwinger limit is seven orders of magnitude above the present record in light intensity achieved by high-power lasers. To close this considerable gap, a promising paradigm consists of reflecting these laser beams off a mirror in relativistic motion, to induce a Doppler effect that compresses the light pulse in time down to the attosecond range and converts it to shorter wavelengths, which can then be focused much more tightly than the initial laser light. However, this faces a major experimental hurdle: how to generate such relativistic mirrors? In this article, we explain how this challenge could nowadays be tackled by using so-called ‘relativistic plasma mirrors’. We argue that approaching the Schwinger limit in the coming years by applying this scheme to the latest generation of petawatt-class lasers is a challenging but realistic objective.

    1 Introduction

    Quantum electrodynamics (QED) is one of the cornerstones of modern physics. It is considered as the most accurately tested physical theory, thanks to high-precision measurements of quantities such as the anomalous magnetic dipole moment of the electron[1,2]. This theory predicts that for large amplitudes of the electromagnetic field, the coupling of photons to the fermionic quantum vacuum plays a major role. This regime of so-called strong-field (SF) QED[3–5] is characterized by effects such as the polarization of vacuum affecting light propagation[6], or the light-induced creation of particle–antiparticle pairs from pure vacuum, a process that can be viewed as the ‘optical breakdown of vacuum’[7–9].

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    Fabien Quéré, Henri Vincenti. Reflecting petawatt lasers off relativistic plasma mirrors: a realistic path to the Schwinger limit[J]. High Power Laser Science and Engineering, 2021, 9(1): 010000e6
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    Category: Research Articles
    Received: Nov. 8, 2020
    Accepted: Nov. 18, 2020
    Published Online: Feb. 8, 2021
    The Author Email: Fabien Quéré (fabien.quere@cea.fr), Henri Vincenti (henri.vincenti@cea.fr)