Narrow linewidth all-fiber laser with 666 W power output

Xiaolin, 王小林 Wang; Pu, 周朴 Zhou; Hu, 肖虎 Xiao; Rongtao, 粟荣涛 Su; Shaofeng, 郭少锋 Guo; Lei, 司磊 Si; Xiaojun, 许晓军 Xu; Zejin, 刘泽金 Liu

doi:10.3788/hplpb20122406.1261

Cited by 4 publications

(1 citation statement)

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“…At present, the technical scheme of Master oscillator power amplifier (MOPA) is generally used to improve the output power of fiber lasers. However, as laser power increases, nonlinear effects such as self-phase modulation (SPM) [5] , four-wave mixing (FWM) [6] , stimulated Raman scattering (SRS) [7] , stimulated Brillouin scattering (SBS) [8] , and transverse mode instability (TMI) occur in lasers [9] . Among them, the TMI effect is one of the main factors limiting the power improvement of narrow linewidth fiber lasers.…”

Section: Introductionmentioning

confidence: 99%

2.2kW linearly polarized narrow linewidth all-fiber laser

Zhang,

Zhang

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

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Recently, narrow linewidth fiber lasers are widely applied in coherent detection and wavelength beam combining. In high-power linearly polarized narrow linewidth fiber lasers, the effect of mode instability (TMI) is one of the main factors limiting its power increase. In this paper, the influence of TMI effect on the output power of high-power linearly polarized narrow-linewidth fiber laser is analyzed, and the suppression method of TMI effect is proposed. Long-wave pumping technologies are used in this article. A single frequency laser with an output power of 100mW is used as the seed source. And the phase modulator broadens the linewidth of the seed source to 23GHz. After three stage amplification, the linewidth of 23GHz, power of 2.2kW, and center wavelength of 1064nm are finally realized. Linearly polarized narrow linewidth fiber laser output with extinction ratio of 98% is achieved. Beam quality is M 2 x=1.2 and M 2 y=1.21. The influence of the pump wavelength on the TMI effect is analyzed. Due to the small core diameter of the fiber (20μm), a high absorption coefficient of the gain fiber for the pump light (1.8dB/m@976nm), the core temperature is high. And the heat introduced by the pump photo quantum defect, causes the refractive index of the fiber core to change. Finally, the TMI effect occurs at lower power. When the pump wavelength is shifted to the long wavelength, the quantum defect of the pump light and the pump absorption coefficient are both reduced. The heat distribution on the entire length of the fiber or on the unit length is reduced. The TMI threshold is increased. And the output power of the linearly polarized narrow linewidth fiber laser is improved.

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Section: Introductionmentioning

confidence: 99%

2.2kW linearly polarized narrow linewidth all-fiber laser

Zhang,

Zhang

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

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Coherent beam combining of high power fiber lasers: Progress and prospect

Liu

Zhang

et al. 2013

Sci. China Technol. Sci.

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Development status of high power fiber lasers and their coherent beam combination

Liu

Jin

et al. 2019

Sci. China Inf. Sci.

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High-power fiber laser has been emerged great potential in a wide range of applications and becomes a robust candidate for high energy solid state laser system. To further increase the output brightness of single-channel fiber laser, high-brightness pump sources and high-power-handling passive components should be fabricated and utilized in the fiber laser systems, in addition to the advanced techniques for multiple nonlinear effects managements. The state-of-the-art high power fiber lasers are reviewed, in terms of narrow-linewidth fiber lasers, broadband fiber lasers and fiber lasers at 2 µm. Coherent beam combining is a promising technique to obtain higher output power while maintaining excellent beam quality simultaneously, which breaks through the bottlenecks of single-channel fiber laser. Based on a series of key techniques for coherent beam combining, high-power coherent beam combining of fiber lasers could be enabled with high combining efficiency. In this paper, we review the progress of high-power fiber lasers and their coherent beam combining in the recent decade, particularly the relevant work in our group. The future prospects of fiber lasers and coherent beam combining technique are also discussed.

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Narrow linewidth all-fiber laser with 666 W power output

Cited by 4 publications

References 0 publications

2.2kW linearly polarized narrow linewidth all-fiber laser

2.2kW linearly polarized narrow linewidth all-fiber laser

Coherent beam combining of high power fiber lasers: Progress and prospect

Development status of high power fiber lasers and their coherent beam combination

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