两个反向旋转场对产生的动量涡
Momentum vortices on pairs production by two counter-rotating fields
摘要：
研究了两个圆偏振场作用下多光子对产生的动量结构。在动量谱上，与同旋向的Ramsey干涉条纹的同心圆环不同，旋向相反的两个旋向场的涡旋结构明显由阿基米德螺线构成。分析和讨论了潜在的物理原因。研究还发现，涡旋斑图对两个光场的相对载波包络相位、时间延迟和旋向性都很敏感，可以作为探测光场特性的一种手段。
英文摘要：
Multiphoton pair production is investigated by focusing on the momentum structures of produced pairs in the polarization plane for the two circularly polarized fields. Upon the momentum spectra, different from the concentric rings with the familiar Ramsey interference fringes for the same handedness, however, the obvious vortex structures are found constituted by the Archimedean spirals for two opposite handedness fields. The underlying physical reasons are analyzed and discussed. It is also found that the vortex patterns are sensitive to the relative carrier envelope phase, the time delay, and the handedness of two fields, which can be used to detect the applied laser field characteristics as a probe way.
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