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arXiv 1810.04091physics.optics
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四波混频过程中的光学Angular Momentum操纵

Optical Angular Momentum Manipulations in a Four Wave Mixing Process

Nikunj Prajapati, Nathan Super, Nicholas R. Lanning, Jonathan P. Dowling, Irina Novikova

摘要:

研究了双Λ组态中,当入射的探测光和控制光都具有非零的光轨道角动量(OAM)时,通过四波混频产生的探测光场和斯托克斯光场之间的空间和量子强度关联.我们观察到生成的Stokes场的拓扑荷服从OAM守恒定律。然而,探测场和斯托克斯场之间强度压缩的最大值和最佳条件在很大程度上与光束的角动量无关,即使这两个场具有显著不同的OAM电荷。我们还研究了一个复合涡旋泵浦场的情况下,包含两个紧密定位的光学涡旋,并表明所产生的斯托克斯场进行OAM对应的总拓扑电荷的泵浦场,进一步扩大了范围可能的OAM操纵技术。

英文摘要:

We investigate the spatial and quantum intensity correlations between the probe and Stokes optical fields produced via four-wave mixing in a double-Λ configuration, when both incoming probe and control fields carry non-zero optical orbital angular momentum (OAM). We observed that the topological charge of the generated Stokes field obeyed the OAM conservation law. However, the maximum values and optimal conditions for the intensity squeezing between the probe and Stokes fields were largely independent of the angular momenta of the beams, even when these two fields had significantly different OAM charges. We also investigated the case of a composite-vortex pump field, containing two closely-positioned optical vortices, and showed that the generated Stokes field carried the OAM corresponding to the total topological charge of the pump field, further expanding the range of possible OAM manipulation techniques.

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