This article is cited in 2 papers

Interaction of extreme light fields with matter

Specific features of radiation emitted upon tunnel ionisation of atoms in extremely intense laser fields

S. V. Popruzhenko^ab, E. B. Kalymbetov<sup>c

a</sup> Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^b Federal Research Center The Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod
^c National Engineering Physics Institute "MEPhI", Moscow

Abstract: Radiation emitted by fast electrons in the process of multiple tunnel ionisation of heavy atoms in the focus of a laser pulse with extreme intensity exceeding 10²² W cm^-2 is studied. It is shown that the spectral-angular distribution of emitted photons in a wide range of angles is qualitatively determined by relations of the synchrotron radiation theory. The dependences of the number and the characteristic frequency of emitted photons on the laser pulse parameters are estimated. The obtained results can be used to determine the maximum laser intensity in the focus.

Keywords: strong laser field, tunnel ionisation, synchrotron radiation, high-power lasers.

Received: 09.07.2021

 English version: Quantum Electronics, 2021, 51:9, 801–806

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