Morizur Jean-François, Nicholls Lachlan, Jian Pu, Armstrong Seiji, Treps Nicolas, Hage Boris, Hsu Magnus, Bowen Warwick, Janousek Jiri, Bachor Hans-A
ARC Centre of Excellence for Quantum-Atom Optics, The Australian National University, Canberra, Australia.
J Opt Soc Am A Opt Image Sci Vis. 2010 Nov 1;27(11):2524-31. doi: 10.1364/JOSAA.27.002524.
Free space propagation and conventional optical systems such as lenses and mirrors all perform spatial unitary transforms. However, the subset of transforms available through these conventional systems is limited in scope. We present here a unitary programmable mode converter (UPMC) capable of performing any spatial unitary transform of the light field. It is based on a succession of reflections on programmable deformable mirrors and free space propagation. We first show theoretically that a UPMC without limitations on resources can perform perfectly any transform. We then build an experimental implementation of the UPMC and show that, even when limited to three reflections on an array of 12 pixels, the UPMC is capable of performing single mode tranforms with an efficiency greater than 80% for the first four modes of the transverse electromagnetic basis.
自由空间传播以及诸如透镜和镜子之类的传统光学系统都执行空间酉变换。然而，通过这些传统系统可用的变换子集在范围上是有限的。我们在此展示一种能够对光场执行任何空间酉变换的酉可编程模式转换器（UPMC）。它基于在可编程变形镜上的一系列反射以及自由空间传播。我们首先从理论上表明，在资源无限制的情况下，一个UPMC可以完美地执行任何变换。然后我们构建了UPMC的实验装置，并表明，即使限制在12像素阵列上进行三次反射，该UPMC对于横向电磁基的前四个模式仍能够以大于80%的效率执行单模变换。
