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.

中文翻译：

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原子在极强激光场中隧道电离时发射的辐射的特定特征

研究了在具有超过 10 ²² W cm ^{-2 的}极端强度的激光脉冲的焦点中重原子的多重隧道电离过程中快速电子发射的辐射。结果表明，发射光子在很宽的角度范围内的光谱角分布是由同步辐射理论的关系定性决定的。估计发射光子的数量和特征频率对激光脉冲参数的依赖性。获得的结果可用于确定焦点中的最大激光强度。