Photonics Research, 2019, 7 (2): 02000167, Published Online: Feb. 19, 2019   

Effective suppression of stimulated Raman scattering in half 10  kW tandem pumping fiber lasers using chirped and tilted fiber Bragg gratings

Meng Wang 1,2,3Zefeng Wang 1,2,3,*Le Liu 1,2,3Qihao Hu 1,2,3Hu Xiao 1,2,3Xiaojun Xu 1,2,3
Author Affiliations
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
3 Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
Abstract
The average power of fiber lasers has been scaled deeply into the kW regime in the past years. However, stimulated Raman scattering (SRS) is still a major factor limiting further power scaling. Here, we have demonstrated for the first time, to the best of our knowledge, the suppression of SRS in a half 10 kW tandem pumping fiber amplifier using chirped and tilted fiber Bragg gratings (CTFBGs). With specially self-designed and manufactured CTFBGs inserted between the seed laser and the amplifier stage, a maximum SRS suppression ratio of >15 dB in spectrum is observed with no reduction in laser efficiency. With one CTFBG, the effective output power is improved to 3.9 kW with a beam quality M2 factor of 1.7 from <3.5 kW with an M2 factor of >2; with two CTFBGs, the effective laser power reaches 4.2 kW with an increasing ratio of 20% and an M2 factor of 1.8, and further power improvement is limited by the power and performance of the 1018 nm pump sources. This work provides an effective SRS suppression method for high-power all-fiber lasers, which is useful for further power scaling of these systems.

Meng Wang, Zefeng Wang, Le Liu, Qihao Hu, Hu Xiao, Xiaojun Xu. Effective suppression of stimulated Raman scattering in half 10  kW tandem pumping fiber lasers using chirped and tilted fiber Bragg gratings[J]. Photonics Research, 2019, 7(2): 02000167.

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