Laterally coupled photonic crystal surface emitting laser arrays

C. Gautam, M. Pan, Y. Chen, T. Rotter, G. Balakrishnan, W. Zhou
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Abstract

We propose and investigate a novel coherent laser array design based on laterally coupled photonic crystal surface-emitting lasers (PCSELs). As a new type of semiconductor laser technology, PCSELs have field confinement in a planar cavity and laser beam emission in the surface normal direction. By engineering lateral couplings between PCSELs with heterostructure photonic crystal designs, we can achieve coherent operations from an array of PCSELs. In this paper, we demonstrate coherent operation from a passively coupled PCSEL array design. We fabricated PCSEL array devices on a GaAs-based quantum well heterostructure at a target wavelength of 1040 nm. Experimental results show that the 2-by-2 PCSEL arrays have spectral linewidth of 0.14–0.22 nm. Beam combining performance was characterized by self-interference experiments. Similar coherency between the PCSEL array and single PCSEL device was observed. Our compact PCSEL array designs by passive lateral coupling have potential applications in fields of on-chip photonic computing, quantum, and information processing.
横向耦合光子晶体表面发射激光器阵列
我们提出并研究了一种基于横向耦合光子晶体表面发射激光器(PCSEL)的新型相干激光阵列设计。作为一种新型半导体激光技术,PCSEL 在平面腔内具有场约束功能,激光束沿表面法线方向发射。通过异质结构光子晶体设计实现 PCSEL 之间的横向耦合,我们就能通过 PCSEL 阵列实现相干操作。在本文中,我们展示了无源耦合 PCSEL 阵列设计的相干运行。我们在基于砷化镓的量子阱异质结构上制造了目标波长为 1040 nm 的 PCSEL 阵列器件。实验结果表明,2 x 2 PCSEL 阵列的光谱线宽为 0.14-0.22 nm。自干涉实验对光束组合性能进行了鉴定。在 PCSEL 阵列和单个 PCSEL 器件之间观察到了类似的一致性。我们通过无源横向耦合设计的紧凑型 PCSEL 阵列有望应用于片上光子计算、量子和信息处理领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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