论文标题
对极化电场中对生产的不对称脉冲影响
Asymmetric pulse effects on pair production in polarized electric fields
论文作者
论文摘要
使用狄拉克 - 黑森堡 - 束缚（DHW）形式主义，研究了在三个典型的极化场（即线性，中椭圆形和圆形的圆极化场）中产生不对称脉冲形状的E ects。研究了两种不对称脉冲长度的不对称性，一种是压缩的，另一种是伸长的。发现干扰E ect随着脉冲长度的压缩而消失，最后，动量光谱的峰值集中在动量空间的中心。对于相反的情况，通过延长脉冲长度，在动量谱系中出现了不干扰的多环结构。研究结果表明，动量光谱对脉冲的不对称性以及田地的极化非常敏感。还发现，在di eRent极化下的电子峰值对的数量密度对电场的不对称性敏感。对于压缩脉冲，数量密度可以在2个数量级上显着增强。这些结果对于计划高功率或/和高强度激光实验可能很有用。
Using the Dirac-Heisenberg-Wigner (DHW) formalism, e?ects of asymmetric pulse shape on the generation of electron-positron pairs in three typical polarized fields, i.e., the linear, middle elliptical and circular ones, are investigated. Two kinds of asymmetries for the falling pulse length, one is compressed and the other is elongated, are studied. It is found that the interference e?ect disappears with the compression of the pulse length, and finally the peak value of the momentum spectrum is concentrated in the center of the momentum space. For the opposite situation by extending the falling pulse length, a multi-ring structure without interference appears in the momentum spectrum. Research results exhibit that the momentum spectrum is very sensitive to the asymmetry of the pulse as well as to the polarization of the fields. It is also found that the number density of electron-positron pairs under di?erent polarizations is sensitive to the asymmetry of electric field. For the compressed falling pulse, the number density can be enhanced significantly over 2 orders of magnitude. These results could be useful in planning high power or/and high-intensity laser experiments.
