Orbital angular momentum modes of high-gain parametric down-conversion
Orbital angular momentum modes of high-gain parametric down-conversion
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DOI：
10.1088/2040-8986/aa600f
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发表时间：
2016-12
影响因子：
2.1
通讯作者：
Lina Beltran;Gaetano Frascella;A. Pérez;R. Fickler;P. Sharapova;M. Manceau;O. Tikhonova;R. Boyd;G. Leuchs;M. Chekhova
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文献类型：
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作者：
Lina Beltran;Gaetano Frascella;A. Pérez;R. Fickler;P. Sharapova;M. Manceau;O. Tikhonova;R. Boyd;G. Leuchs;M. Chekhova
具有轨道角动量（OAM）的光束是量子信息的方便载体。它们还可以用于赋予颗粒旋转运动并在成像中提供高分辨率。由于参量下转换（PDC）中OAM的守恒性，在低增益下产生的信号光子和闲频光子具有完全反相关的OAM值。研究高增益PDC的OAM特性是有趣的，其中相同的OAM模式可以填充有大量但相关的光子。在这里，我们研究了高增益PDC的OAM谱，并表明OAM模式的内容可以通过改变泵浦功率和源的配置来控制。在我们的实验中，我们使用的源由两个非线性晶体分开的空气间隙。我们讨论了这个源发出的PDC辐射的OAM特性，并提出了可能的修改。
Light beams with orbital angular momentum (OAM) are convenient carriers of quantum information. They can also be used for imparting rotational motion to particles and providing high resolution in imaging. Due to the conservation of OAM in parametric down-conversion (PDC), signal and idler photons generated at low gain have perfectly anti-correlated OAM values. It is interesting to study the OAM properties of high-gain PDC, where the same OAM modes can be populated with large, but correlated, numbers of photons. Here we investigate the OAM spectrum of high-gain PDC and show that the OAM mode content can be controlled by varying the pump power and the configuration of the source. In our experiment, we use a source consisting of two nonlinear crystals separated by an air gap. We discuss the OAM properties of PDC radiation emitted by this source and suggest possible modifications.