High-power 1560 nm single-frequency erbium fiber amplifier core-pumped at 1480 nm. (17th January 2022)

• Record Type: Journal Article
• Authors: Cheng, Xin; Lin, Zhiquan; Yang, Xuezong; Cui, Shuizhen; Zeng, Xin; Jiang, Huawei; Feng, Yan
• Is Part Of: High power laser science and engineering. Volume 10(2022)
• Publication Date: 2022-01-17
• Subjects: in-band pump -- Raman fiber laser -- single-frequency Er fiber amplifier; High power lasers -- Periodicals; 621.366
• DOI: 10.1017/hpl.2023.6
• Languages: English
• ISSNs: 2095-4719

Abstract

Abstract: High-power continuous-wave single-frequency Er-doped fiber amplifiers at 1560 nm by in-band and core pumping of a 1480 nm Raman fiber laser are investigated in detail. Both co- and counter-pumping configurations are studied experimentally. Up to 59.1 W output and 90% efficiency were obtained in the fundamental mode and linear polarization in the co-pumped case, while less power and efficiency were achieved in the counter-pumped setup for additional loss. The amplifier performs indistinguishably in terms of laser linewidth and relative intensity noise in the frequency range up to 10 MHz for both configurations. However, the spectral pedestal is raised in co-pumping, caused by cross-phase modulation between the pump and signal laser, which is observed and analyzed for the first time. Nevertheless, the spectral pedestal is 34.9 dB below the peak, which has a negligible effect for most applications.