Li Yufei, Xia Di, Cheng Huanjie, Luo Liyang, Wang Linyi, Zeng Siqing, Yang Shuixian, Li Linze, Chen Baile, Zhang Bin, Li Zhaohui
Opt Lett. 2024 Aug 15;49(16):4529-4532. doi: 10.1364/OL.534233.
Chalcogenide glasses (ChGs) possess a high elasto-optic coefficient, making them ideal for applications in microwave photonics and narrow-linewidth lasers based on stimulated Brillouin scattering (SBS). However, current AsS-based integrated devices suffer from poor stability and low laser-induced damage threshold, and planar ChG devices feature limited quality factors. In this Letter, we propose and demonstrate a high-quality integrated GeSbS ChG Brillouin photonic device. By introducing Euler bending structures, we suppress high-order optical modes and reduce propagation losses in a finger-shaped GeSbS microresonator, resulting in a compact footprint of 3.8 mm and a high intrinsic quality factor of 5.19 × 10. The combination of GeSbS material's high Brillouin gain and the resonator's high-quality factor enables the generation of stimulated Brillouin lasers with a low threshold of 0.96 mW and a fundamental linewidth of 58 Hz. Moreover, cascaded stimulated Brillouin lasers can be realized up to the seventh order, yielding microwave beat frequencies up to 40 GHz.
硫族化物玻璃（ChGs）具有高弹光系数，使其成为基于受激布里渊散射（SBS）的微波光子学和窄线宽激光器应用的理想材料。然而，目前基于AsS的集成器件稳定性差且激光损伤阈值低，平面ChG器件的品质因数有限。在本信函中，我们提出并展示了一种高质量的集成GeSbS ChG布里渊光子器件。通过引入欧拉弯曲结构，我们抑制了高阶光学模式并降低了手指形GeSbS微谐振器中的传播损耗，从而实现了3.8毫米的紧凑尺寸和5.19×10的高本征品质因数。GeSbS材料的高布里渊增益与谐振器的高品质因数相结合，使得能够产生阈值低至0.96毫瓦且基频线宽为58赫兹的受激布里渊激光器。此外，级联受激布里渊激光器最高可实现七阶，产生高达40吉赫兹的微波拍频。
