High-power 1018  nm ytterbium-doped fiber laser and its application in tandem pump

Hu, Xiao; Leng, Jinyong; Zhang, Hanwei; Huang, Liangjin; Xu, Jiangming; Zhang, Pu

doi:10.1364/ao.54.008166

Cited by 70 publications

(26 citation statements)

References 30 publications

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“…In most of present high-power fiber laser systems, laser diodes are used as pump source. Recently, tandem pumping technique, which uses 'fiber laser' to pump active fiber, has been under intensive research, where the brightness of the pump laser is significantly increased [3,[46][47][48][49] . In the present sub-section, we demonstrate the NFA in tandem pumping scheme for the first time.…”

Section: Tandem-pumped High-power Nfamentioning

confidence: 99%

Toward high-power nonlinear fiber amplifier

Zhang

et al. 2018

High Pow Laser Sci Eng

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Stimulated Raman scattering (SRS) effect is considered to be one of the main obstacles for power scaling in general-type fiber lasers. Different from previous techniques that aim at suppressing SRS, nonlinear fiber amplifier (NFA), which manipulates and employs the SRS for power scaling in rare-earth-doped fiber, is under intensive research in recent years. In this paper, the authors will present an all-round study on this new kind of high-power fiber amplifier. A theoretical model is proposed based on the rate equation and amplified spontaneous emission (ASE), with random noise taken into account. By numerical solving of the theoretical model, the power scaling potential, heat analysis and advantages in suppressing the undesired backscattering light are quantificationally analyzed for the first time. Then two different types of high-power NFAs are demonstrated individually. Firstly, a laser diode pumped NFA has reached kilowatt output power, and the results agree well with theoretical predictions. Secondly, a tandem-pumped NFA is proposed for the first time and validated experimentally, in which 1.5 kW output power has been achieved. The authors also briefly discuss several new issues relating to the complex nonlinear dynamics that occur in high-power NFAs, which might be interesting topics for future endeavors.

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Section: Tandem-pumped High-power Nfamentioning

confidence: 99%

Toward high-power nonlinear fiber amplifier

Zhang

et al. 2018

High Pow Laser Sci Eng

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“…Despite most of the high power, narrow-bandwidth fiber amplifiers being pumped by 976 nm laser diodes (LDs) for being favorable of SBS management, tandem pumping is a robust route for simultaneously decreasing the quantum defect and pump absorption for TMI suppression [33,37] . This technique had been widely used in high power fiber amplifiers with broadband spectral characteristics [38][39][40][41][42] , and the output powers had been remarkably scaled to be beyond 3.5 kW power level by several groups [38,41,42] . Due to the small absorption area of the Yb-doped active fiber at 1018 nm, one point should be noted that the suppressions of SBS and stimulated Raman scattering (SRS) are more difficult when tandem pumping is employed in high power, narrow-bandwidth fiber amplifiers.…”

Section: Introductionmentioning

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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“…It is reported that the 10 kW single-mode fiber lasers developed by IPG photonics were pumped by 1018 nm fiber lasers based on tandem pumping [10]. From then on, the important role of YDFLs operating around 1018 nm attracted much attention for the use of tandem pumping [11][12][13]. After intensive theoretical and experimental investigations, the important rules to build high power 1018 nm YDFLs are well known, which include employing YDF with a high core/inner cladding area ratio, shortening the YDF length, suppressing Fresnel reflection and so on.…”

Section: Introductionmentioning

confidence: 99%

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

Leng

et al. 2017

Laser Phys. Lett.

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In this letter, we present a 2240 W high-brightness 1018 nm fiber laser by power combination. The system consists of seven 1018 nm ytterbium-doped fiber lasers and a homemade 7 × 1 all-fiber power combiner. The output core diameter of the power combiner is 50 µm and the numerical aperture is 0.2. The overall transmission efficiency is about 99%. This high-power, high-brightness fiber laser can be used as a pump source in tandem pumping configurations for several kilowatts of power scaling.

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High-power 1018 nm ytterbium-doped fiber laser and its application in tandem pump

Cited by 70 publications

References 30 publications

Toward high-power nonlinear fiber amplifier

Toward high-power nonlinear fiber amplifier

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

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

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