作为laser强度诊断方法的惰性气体中电子种子的对产生
Pair production seeded by electrons in noble gases as a method for the laser intensity diagnostics
摘要：
在这项研究中，我们探讨了利用强激光场中的电子-正电子对产生过程作为测量相应激光辐射强度的工具的可能性。在初始状态下，我们考虑自由电子气体或中性氙气体，其电子被电离。一旦这些种子电子在外部激光场中获得足够的能量，它们就可以发射高能光子，这些光子随后通过Breit-Wheeler机制衰变产生电子-正电子对。通过探测所产生的正电子，人们可以通过本研究中推导出的一一对应关系来恢复激光强度的值。我们分析了两种不同的配置的外场：设置涉及一个单独的聚焦激光脉冲和两个反向传播的激光脉冲的组合。进行数值计算和分析其精度，我们证明，根据我们的估计，激光强度可以确定的范围内的$10^{23}$ - $10^{26}~\text{W}/\text{cm}^2$与$10$ - $50 \%$的相对不确定度。
英文摘要：
In this study we explore the possibility of using the process of electron-positron pair creation in strong laser fields as a tool for measuring the intensity of the corresponding laser radiation. In the initial state we consider either free electron gas or gas of neutral xenon, the electrons of which get ionized. Once these seed electrons gain sufficient energy in the external laser field, they can emit high-energy photons which subsequently decay producing electron-positron pairs via the Breit-Wheeler mechanism. By detecting the resulting positrons, one can recover the value of the laser intensity by means of the one-to-one correspondences deduced in the present investigation. We analyze two different configurations of the external field: the setup involving an individual focused laser pulse and the combination of two counterpropagating laser pulses. Performing numerical calculations and analyzing their accuracy, we demonstrate that based on our estimates, the laser intensity can be determined within the range $10^{23}$-$10^{26}~\text{W}/\text{cm}^2$ with a relative uncertainty of $10$-$50 \%$.
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