Research Progress on Narrow-Linewidth Broadband Tunable External Cavity Diode Lasers

作者：Jie Chen, Wei Luo, Yue Lou, Shenglan Li, Enning Zhu, Xiaolei Wu, Su‐Peng Yu, Xiaofei Gao, Zaijin Li, Dongxin Xu, Yi Qu, Lin Li · 发表于：Coatings · 年份：2025 · DOI：10.3390/coatings15091035 · 被引用次数：2 · 研究领域：Semiconductor Lasers and Optical Devices、Advanced Fiber Optic Sensors、Photonic and Optical Devices

Narrow-linewidth broadband tunable external cavity diode lasers (NBTECDLs), with their broadband tuning range, narrow linewidth, high side-mode suppression ratio (SMSR), and high output power, have become important laser sources in many fields such as optical communication, spectral analysis, wavelength division multiplexing systems, coherent detection, and ultra-high-speed optical interconnection. This paper briefly describes the basic theory of NBTECDLs, introduces NBTECDLs with diffraction grating type, fiber Bragg grating (FBG) type, and waveguide type, and conducts an in-depth analysis on the working principles and performance characteristics of NBTECDLs based on different NBTECDL types. Then, it reviews the latest research progress on Littrow-type, Littman-type, FBG-type, and waveguide-type NBTECDLs in detail and compares and summarizes the characteristics of Littrow-type NBTECDLs, Littman-type NBTECDLs, FBG-type NBTECDLs, and waveguide-type NBTECDLs. Finally, it looks at the structural features, key technologies, optical performance, and application fields of the most cutting-edge research in recent years and summarizes the challenges and future development directions of NBTECDLs.