Topological insulator lasers are arrays of semiconductor lasers that exploit fundamental features of topology to force all emitters to act as a single coherent laser. In this study, we demonstrate a topological insulator vertical-cavity surface-emitting laser (VCSEL) array. Each VCSEL emits vertically, but the in-plane coupling between emitters in the topological-crystalline platform facilitates coherent emission of the whole array. Our topological VCSEL array emits at a single frequency and displays interference, highlighting that the emitters are mutually coherent. Our experiments exemplify the power of topological transport of light: The light spends most of its time oscillating vertically, but the small in-plane coupling is sufficient to force the array of individual emitters to act as a single laser.

中文翻译：

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拓扑绝缘体垂直腔激光阵列

拓扑绝缘体激光器是半导体激光器阵列，它利用拓扑的基本特征迫使所有发射器充当单个相干激光器。在这项研究中，我们展示了一种拓扑绝缘体垂直腔面发射激光器 (VCSEL) 阵列。每个 VCSEL 垂直发射，但拓扑晶体平台中发射器之间的面内耦合有助于整个阵列的相干发射。我们的拓扑 VCSEL 阵列以单一频率发射并显示干扰，突出显示发射器是相互相干的。我们的实验体现了光的拓扑传输能力：光的大部分时间都在垂直振荡，但小的面内耦合足以迫使单个发射器阵列充当单个激光器。