Supersymmetric nitride-based semiconductor lasers

边缘发射激光器（EELs）的基本横向模式操作通常可以通过使用足够窄或浅蚀刻的激光脊来实现。这反过来又导致小宽度的有源区域，导致适度的发射功率。此外，活动区域宽度小，导致局部产生的高热功率密度难以消散。在这个项目中，我们建议在氮基激光器的背景下采用超对称（SUSY）理论来提高其基模发射。SUSY能够同时扩大激光脊和保持基模发射，这将有助于提高光功率和高质量的由电驱动器件发射的激光束。该项目包括三个主要目标。前两个部分涉及设计和实现在脉冲状态和连续波连续工作下工作的susy激光器。这两个目标都需要不同的susy激光器设计，这将在项目中进行研究。第三个目标是与susy激光器的实验表征有关，揭示了负责稳定单模运行的物理。这种新的电驱动激光器结构，从未在实验和理论上进行过研究，是非厄米物理的一个迷人的例子，它不仅为项目中考虑的结构带来了巨大的希望，而且为所有半导体材料结构中制造的其他平面内激光器带来了巨大的希望，包括带间级联和量子级联激光器，以及垂直腔表面发射激光器（VCSELs）。光纤激光器等。因此，在本项目中，我们不仅关注氮基边缘发射激光器性能的改进，而且还关注susy激光器中发生的关于异常点和奇偶时间对称性破缺作用的基本物理现象的透彻理解，这些现象有望在理解susy激光器的工作原理中发挥关键作用。

Fundamental lateral mode operation of edge-emitting lasers (EELs) can typically be achieved by using a sufficiently narrow or shallowly etched laser ridge. This in turn leads to small width of active area resulting in moderate emitted power. In addition, small width of active areas contributes to local generation of high thermal power density being problematic to dissipate. In this project we propose to adopt supersymmetry (SUSY) theory in a context of nitride-based lasers to boost their fundamental mode emission. SUSY enables widening the laser ridge and sustaining fundamental mode emission simultaneously, that will contribute to enhancement of optical power with high quality of the laser beam emitted by electrically driven devices. The project consists of three main objectives. First two are related to designing and realisation the SUSY-lasers operating under the pulse regime and at continuous-wave CW operation. Both aims require different designs of SUSY-lasers that will be investigated in the project. Third aim is related to experimental characterisation of the SUSY-lasers unveiling reach physics responsible for stable single mode operation. This new electrically driven laser configuration, that has never been studied experimentally nor theoretically, is a fascinating example of non-Hermitian physics that brings great promise for the enhancement of lasing properties not only of the configuration considered in the project, but also other in-plane lasers fabricated in all semiconductor material configurations including interband-cascade and quantum-cascade lasers, as well as vertical-cavity surface emitting lasers (VCSELs), fiber lasers etc. Therefore in this project we focus not only on improvement of nitride-based edge-emitting lasers properties but also on a thorough understanding of the fundamental physical phenomena occurring in SUSY-lasers concerning the role of the exceptional points and parity-time symmetry breaking, that are expected to play a key role in understanding the operational principles of SUSY-lasers.