Pump RIN coupling to frequency noise of a polarization-maintaining 2 µm single frequency fiber laser

作者：Qian Zhang, Yubin Hou, Weihua Song, Xi Wang, C. D. Blair, Xu Chen, L. Ju, C. Zhao, Pu Wang · 发表于：Optics Express · 年份：2021 · DOI：10.1364/oe.415298 · 被引用次数：17 · 研究领域：Advanced Fiber Optic Sensors、Advanced Fiber Laser Technologies、Photonic Crystal and Fiber Optics

We investigated the frequency noise coupling mechanism of a 2 μ m polarization-maintaining single frequency fiber laser (SFFL) theoretically and experimentally. The coupling of pump’s relative intensity noise (RIN) to frequency noise of a single-frequency high-gain silica fiber laser is shown experimentally to be consistent with a theoretical model where thermal expansion and thermo-optic effect mediate the coupling. The measured and theoretical frequency noise of the 2 μ m SFFL with three pump sources is compared. We find using a 1550 nm single frequency laser pump source produces the lowest frequency noise, less than 100 H z / H z at frequencies higher than 100 Hz.