Hu Cong, Xiao Yu, He Yuhang, Liu Yusong, Song Yuyan, Tang Xiahui
Appl Opt. 2022 Feb 20;61(6):1482-1491. doi: 10.1364/AO.451538.
We report a simple and effective approach for designing resonators with high brightness and high mode discrimination based on optimizing the single-mode power factor of the fundamental mode, which represents the total power extracted by the fundamental mode from the gain medium. By optimizing the single-mode power factor of the fundamental mode, the cavity can be designed to operate in mono-mode, increasing mode purity and improving brightness significantly. Our method is verified on a digital laser with a spatial light modulator as the rear mirror, and the loaded phase profile is acquired by a simulated annealing algorithm. As a result, the optimized resonator with a Fresnel number of 7.2 operates in a single fundamental mode, and the brightness of the output beam yields 240% and 276% improvement, compared with conventional plane-plane and plane-concave resonators, respectively. This approach is ready to be applied to more sophisticated mode selection and may serve as a general method for designing cavities with high efficiency and high brightness.
我们报告了一种基于优化基模的单模功率因数来设计具有高亮度和高模式分辨能力的谐振器的简单有效方法，该功率因数代表基模从增益介质中提取的总功率。通过优化基模的单模功率因数，可以将谐振腔设计为单模运行，从而显著提高模式纯度并提升亮度。我们的方法在以空间光调制器作为后镜的数字激光器上得到了验证，并且通过模拟退火算法获取加载的相位分布。结果，菲涅耳数为7.2的优化谐振腔以单一基模运行，与传统的平-平谐振腔和平-凹谐振腔相比，输出光束的亮度分别提高了240%和276%。这种方法随时可应用于更复杂的模式选择，并且可以作为一种设计高效高亮度谐振腔的通用方法。
