Mitigation of stimulated Raman scattering in kilowatt-level diode-pumped fiber amplifiers with chirped and tilted fiber Bragg gratings

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英文篇名：Mitigation of stimulated Raman scattering in kilowatt-level diode-pumped fiber amplifiers with chirped and tilted fiber Bragg gratings 作者：Meng ; Wang ; Le ; Liu ; Zefeng ; Wang ; Xiaoming ; Xi ; Xiaojun ; Xu 英文作者：Meng Wang;Le Liu;Zefeng Wang;Xiaoming Xi;Xiaojun Xu;College of Advanced Interdisciplinary Studies, National University of Defense Technology;State Key Laboratory of Pulsed Power Laser Technology;Hunan Provincial Key Laboratory of High Energy Laser Technology; 英文关键词：fiber Bragg gratings;;fiber lasers;;high power;;stimulated Raman scattering 中文刊名：HPLS 英文刊名：高功率激光科学与工程(英文版) 机构：College of Advanced Interdisciplinary Studies, National University of Defense Technology;State Key Laboratory of Pulsed Power Laser Technology;Hunan Provincial Key Laboratory of High Energy Laser Technology; 出版日期：2019-03-30 出版单位：High Power Laser Science and Engineering 年：2019 期：v.7 基金：supported by the National Natural Science Foundation of China(No.11274385) 语种：英文; 页：HPLS201901018 页数：6 CN：01 ISSN：31-2078/O4 分类号：132-137

摘要

The average power of diode-pumped fiber lasers has been developed deeply into the kW regime in the past years.However, stimulated Raman scattering(SRS) is still a major factor limiting the further power scaling. Here, we have demonstrated the mitigation of SRS in kilowatt-level diode-pumped fiber amplifiers using a chirped and tilted fiber Bragg grating(CTFBG) for the first time. The CTFBG is designed and inscribed in large-mode-area(LMA) fibers, matching with the operating wavelength of the fiber amplifier. With the CTFBG inserted between the seed laser and the amplifier stage, an SRS suppression ratio of ~10 dB is achieved in spectrum at the maximum output laser power of 2.35 kW,and there is no reduction in laser slope efficiency and degradation in beam quality. This work proves the feasibility and practicability of CTFBGs for SRS suppression in high-power fiber lasers, which is very useful for the further power scaling.
        The average power of diode-pumped fiber lasers has been developed deeply into the kW regime in the past years.However, stimulated Raman scattering(SRS) is still a major factor limiting the further power scaling. Here, we have demonstrated the mitigation of SRS in kilowatt-level diode-pumped fiber amplifiers using a chirped and tilted fiber Bragg grating(CTFBG) for the first time. The CTFBG is designed and inscribed in large-mode-area(LMA) fibers, matching with the operating wavelength of the fiber amplifier. With the CTFBG inserted between the seed laser and the amplifier stage, an SRS suppression ratio of ~10 dB is achieved in spectrum at the maximum output laser power of 2.35 kW,and there is no reduction in laser slope efficiency and degradation in beam quality. This work proves the feasibility and practicability of CTFBGs for SRS suppression in high-power fiber lasers, which is very useful for the further power scaling.

引文

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