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Article

2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression

by 1,2, 1,2, 1,2, 1,2, 1,2,3, 1,2,3 and 1,2,3,*
1
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2
Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
3
State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
*
Author to whom correspondence should be addressed.
Photonics 2021, 8(12), 532; https://doi.org/10.3390/photonics8120532 (registering DOI)
Received: 3 October 2021 / Revised: 20 November 2021 / Accepted: 22 November 2021 / Published: 25 November 2021
(This article belongs to the Special Issue High-Power Lasers and Amplifiers)
We report a high power, narrow linewidth fiber laser based on oscillator one-stage power amplification configuration. A fiber oscillator with a center wavelength of 1080 nm is used as the seed, which is based on a high reflection fiber Bragg grating (FBG) and an output coupling FBG of narrow reflection bandwidth. The amplifier stage adopted counter pumping. By optimizing the seed and amplifier properties, an output laser power of 2276 W was obtained with a slope efficiency of 80.3%, a 3 dB linewidth of 0.54 nm and a signal to Raman ratio of 32 dB, however, the transverse mode instability (TMI) began to occur. For further increasing the laser power, a high-power chirped and tilted FBG (CTFBG) was inserted between the backward combiner and the output passive fiber, experimental results showed that both the threshold of Stimulated Raman scattering (SRS) and TMI increased. The maximum laser power was improved to 2576 W with a signal to Raman ratio of 42 dB, a slope efficiency of 77.1%, and a 3 dB linewidth of 0.87 nm. No TMI was observed and the beam quality factor M2 maintained about 1.6. This work could provide a useful reference for obtaining narrow-linewidth high-power fiber lasers with high signal to Raman ratio. View Full-Text
Keywords: narrow linewidth; fiber lasers; Stimulated Raman scattering; chirped and tilted fiber Bragg gratings narrow linewidth; fiber lasers; Stimulated Raman scattering; chirped and tilted fiber Bragg gratings
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MDPI and ACS Style

Tian, X.; Gao, C.; Wang, C.; Zhao, X.; Wang, M.; Xi, X.; Wang, Z. 2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression. Photonics 2021, 8, 532. https://doi.org/10.3390/photonics8120532

AMA Style

Tian X, Gao C, Wang C, Zhao X, Wang M, Xi X, Wang Z. 2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression. Photonics. 2021; 8(12):532. https://doi.org/10.3390/photonics8120532

Chicago/Turabian Style

Tian, Xin, Chenhui Gao, Chongwei Wang, Xiaofan Zhao, Meng Wang, Xiaoming Xi, and Zefeng Wang. 2021. "2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression" Photonics 8, no. 12: 532. https://doi.org/10.3390/photonics8120532

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