Laguerre-Gaussian mode sorter
Laguerre-Gaussian mode sorter
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DOI：
10.1038/s41467-019-09840-4
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发表时间：
2019-04-26
影响因子：
16.6
通讯作者：
Carpenter, Joel
中科院分区：
文献类型：
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作者：
Fontaine, Nicolas K.;Ryf, Roland;Carpenter, Joel
为特定应用开发特定波特性需要能够基于该特性进行区分的组件。虽然光谱或偏振分解可以很简单，但空间分解本质上更困难，并且无论波类型如何，都存在很少的选择。用透镜进行的傅里叶分解是空间分解的一个罕见的简单例子，它具有重要的实际意义和实用的简单性;它是将光束二维分解成其线性动量分量。然而，这往往不是最合适的空间基础。在此之前，没有一个装置能够将二维分解成轨道角动量分量，或者实际上是任何离散基，尽管它是许多波现象的基本属性。我们展示了一种光学设备，能够分解成一个笛卡尔网格的相同的高斯斑点，每个包含一个单一的拉盖尔-高斯分量的光束，只使用一个空间光调制器和反射镜。
Exploiting a particular wave property for a particular application necessitates components capable of discriminating in the basis of that property. While spectral or polarisation decomposition can be straightforward, spatial decomposition is inherently more difficult and few options exist regardless of wave type. Fourier decomposition by a lens is a rare simple example of a spatial decomposition of great practical importance and practical simplicity; a two-dimensional decomposition of a beam into its linear momentum components. Yet this is often not the most appropriate spatial basis. Previously, no device existed capable of a two-dimensional decomposition into orbital angular momentum components, or indeed any discrete basis, despite it being a fundamental property in many wave phenomena. We demonstrate an optical device capable of decomposing a beam into a Cartesian grid of identical Gaussian spots each containing a single Laguerre-Gaussian component, using just a spatial light modulator and mirror.