Vortices in multiphoton pair production by two-color rotating laser fields
Vortices in multiphoton pair production by two-color rotating laser fields
复制标题
双色旋转激光场产生多光子对中的涡流
DOI：
10.1088/1361-6455/aaf3f9
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Li Y J
中科院分区：
文献类型：
--
作者：
Li Z L;Xie B S;Li Y J
利用实时Dirac-Heisenberg-Wigner方法研究了双色椭圆偏振场产生多光子对的涡旋斑图。对于具有相同或相反螺旋度的双色圆偏振场，我们揭示了由偶数个螺旋构成的涡旋和由奇数个螺旋构成的涡旋。前者对应于通过从每个旋转场吸收奇数（或偶数）个光子来产生多光子对，而后者对应于通过从一个场吸收奇数个光子和从另一个场吸收偶数个光子来产生多光子对。这一结果与定性的理论分析相一致。对于双色椭圆偏振场，涡旋斑图对椭圆度非常敏感，需要较大的椭圆度才能探测到涡旋。该研究为今后在实验上观察多光子对产生提供了理论参考。
Vortex patterns in multiphoton pair creation by two-color elliptically polarized fields are investigated using the real-time Dirac–Heisenberg–Wigner formalism. For two-color circularly polarized fields with same or opposite helicities, we uncover both the vortices constituted of an even number of spirals and the ones with an odd number of spirals. The former corresponds to multiphoton pair creation by absorbing an odd (or even) number of photons from each rotating field, while the latter corresponds to multiphoton pair creation by absorbing an odd number of photons from one field and an even number of photons from the other one. This result is in agreement with qualitative theoretical analysis. For two-color elliptically polarized fields, vortex patterns are very sensitive to the ellipticity and a large ellipticity is required to detect vortices. This study provide a theoretical reference to observe multiphoton pair creation experimentally in future.