2240 W high-brightness 1018 nm fiber laser for tandem pump application

Li, Ruixian; Hu, Xiao; Leng, Jinyong; Chen, Zilun; Xu, Jiangming; Wu, Jian; Zhang, Pu

doi:10.1088/1612-202x/aa7d84

Cited by 11 publications

(7 citation statements)

References 17 publications

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“…The final amplifier is pumped by using three 2 kW power level 1018 nm all-fiberized lasers via a combiner. Each 2 kW level 1018 nm pump laser is constructed by power combining of seven 300 W level 1018 nm single mode fiber lasers via a homemade all-fiberized power combiner [44] . The active fiber used in this amplifier is large mode area and double clad Yb-doped fiber (YDF-III) with a core diameter of and an inner cladding diameter of .…”

Section: Methodsmentioning

confidence: 99%

High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

Meng

et al. 2018

High Pow Laser Sci Eng

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An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with record output power of 4 kW level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced into the narrow-bandwidth MOPA system for thermally induced mode instability (TMI) suppression. The stimulated Brillouin scattering (SBS) effect is balanced by simply using one-stage phase modulation technique. With different phase modulation signals, SBS limited output powers of 336 W, 1.2 kW and 3.94 kW are respectively achieved with spectral bandwidths accounting for 90% power of ${\sim}$0.025, 0.17 and ${\sim}$0.89 nm. Compared with our previous 976 nm pumping system, TMI threshold is overall boosted to be ${>}$5 times in which tandem pumping increases the TMI threshold of ${>}$3 times. The beam quality ($M^{2}$ factor) of the output laser is well within 1.5 below the TMI threshold while it is ultimately saturated to be 1.86 with the influence of TMI at maximal output power. Except for SBS and TMI, stimulated Raman scattering (SRS) effect will be another challenge for further power scaling. In such a high power MOPA system, multi-detrimental effects (SBS, SRS and TMI) will coexist and may be mutual-coupled, which could provide a well platform for further comprehensively investigating and optimizing the high power, narrow-bandwidth fiber amplifiers.

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Section: Methodsmentioning

confidence: 99%

High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

Meng

et al. 2018

High Pow Laser Sci Eng

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“…For this fiber, we obtain 1.5 X 7.5 and D o /D th ≈ 3.5 × 10 −3 ; therefore, 0.005 δT o /∆T 0.026. Note that the upper limit is obtained for γ 1, which is generally the case when the heating from the quantum defect totally overwhelms the contribution from the parasitic absorption of the pump and signal-this limit can be avoided in modern high-power fiber amplifiers by lowering the quantum defect [9] or in nearly radiationbalanced lasers [10][11][12][13]. We have 0.0016 δT a /δT o 0.13, depending on the value of γ.…”

Section: B Cladding-pumped Fiber Lasermentioning

confidence: 98%

Temperature distribution inside a double-cladding optical fiber laser or amplifier

Mafi

2020

J. Opt. Soc. Am. B

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It is shown using general arguments that at any location along an optical fiber laser or amplifier, the temperature variation across the fiber is two to three orders of magnitude smaller than the difference between the fiber surface temperature and the ambient temperature. Therefore, the fiber heats almost uniformly in its transverse cross-section regardless of how hot it gets relative to its surroundings, and regardless of how the temperature varies along the fiber. The analysis applies to a broad range of fiber laser and amplifier designs subject to convective air-cooling but can be readily adapted to other forms of cooling.

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“…The seed fiber laser operates at ~1080 nm and can deliver up to ~300 W output power. The 1018 nm pump laser module is based on the 7×1 beam combining technique [31], which consists of seven individual 1018 nm fiber oscillators. Each fiber oscillator exploits optical fiber with the core/inner-cladding diameter of 15/130 μm and is capable of delivering…”

Section: Fiber Characterization and Experimental Setupmentioning

confidence: 99%

Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control

et al. 2022

High Pow Laser Sci Eng

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In this work, the confined-doped fiber with the core/inner-cladding diameter of 40/250 µm and a relative doping ratio of 0.75 is fabricated through the modified chemical vapor deposition method combined with the chelate gas deposition technique, and subsequently applied in a tandem-pumped fiber amplifier for high power operation and transverse mode instability (TMI) mitigation. Notably, the impact of the seed laser's power

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2240 W high-brightness 1018 nm fiber laser for tandem pump application

Cited by 11 publications

References 17 publications

High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression

Temperature distribution inside a double-cladding optical fiber laser or amplifier

Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control

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