Opt Express. 2023 Feb 27;31(5):8518-8534. doi: 10.1364/OE.479222.
In this paper, an analysis of the nonlinear laser operation in an active medium made of a parity time (PT) symmetric structure placed in a Fabry-Perot (FP) resonator is demonstrated for the first time. The FP mirrors' reflection coefficients and phases, the PT symmetric structure period, primitive cell number, and the gain and loss saturation effects are taken into account in a presented theoretical model. The modified transfer matrix method is used to obtain characteristics of laser output intensity. Numerical results show that the selection of the appropriate phase of the FP resonator's mirrors makes it possible to obtain different levels of the output intensity. Moreover, for certain value of a ratio of the grating period to the operating wavelength, it is possible to obtain the bistability effect.
本文首次演示了在放置在法布里-珀罗（FP）谐振器中的奇偶时间（PT）对称结构的有源介质中进行非线性激光操作的分析。所提出的理论模型考虑了 FP 镜的反射系数和相位、PT 对称结构的周期、原胞数、增益和损耗饱和效应。使用改进的传输矩阵方法获得激光输出强度特性。数值结果表明，选择适当的 FP 谐振器镜的相位可以获得不同水平的输出强度。此外，对于光栅周期与工作波长的比值为一定值，可以获得双稳效应。
