Opt Express. 2023 Feb 13;31(4):6770-6781. doi: 10.1364/OE.484580.
Effective manipulation of resonant mode, output power and modulation bandwidth of lasers are all of vital importance for practical application scenarios such as communication systems. We show that by breaking the parity-time (PT) symmetry, single mode operation lasing can be realized in an intrinsic multiple mode Fabry-Perot (FP) resonator. Two identical FP resonators are employed to establish a symmetric system and high output power can be achieved with lower fabrication difficulty and intracavity losses compared with ring resonators. The small-signal response and direct modulation of the PT-symmetric FP laser have also been demonstrated with electrical pumping. Our work opens new avenues for mode selection of high-performance FP lasers and provides a cost-effective candidate for practical applications such as communication systems.
有效控制激光器的谐振模式、输出功率和调制带宽对于通信系统等实际应用场景至关重要。我们通过打破宇称时间（PT）对称，实现了在固有多模法布里-珀罗（FP）谐振腔中的单模激射。两个相同的 FP 谐振腔被用来建立一个对称系统，与环形谐振腔相比，它可以用更低的制作难度和腔内损耗来实现更高的输出功率。我们还用电泵浦演示了 PT 对称 FP 激光的小信号响应和直接调制。我们的工作为高性能 FP 激光器的模式选择开辟了新的途径，并为通信系统等实际应用提供了一种具有成本效益的候选方案。
