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

Wu, Hanshuo; Li, Haobo; An, Yi; Li, Ruixian; Chen, Xiao; Hu, Xiao; Huang, Liangjin; Yang, Huan; Yan, Zhuangzhi; Leng, Jinyong; Pan, Zhiyong; Zhang, Pu

doi:10.1017/hpl.2022.31

Cited by 7 publications

(5 citation statements)

References 46 publications

(49 reference statements)

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“…At the same pump wavelength, although the beam quality of the output laser may be slightly degraded (affected by fiber fusion), the improvement of the maximum output power also brings the improvement of the brightness of the laser. In fact, similar abnormal TMI phenomena were reported as early as 2019, and in recent years, there have been reports of increasing the TMI threshold by introducing higher order modes [89][90][91]. In [90], they believe that introducing higher-order modes The results are shown in Table 5.…”

Section: Abnormal Tmi Suppression Methods Based On Fiber Coilingsupporting

confidence: 59%

Section: Abnormal Tmi Suppression Methods Based On Fiber Coilingsupporting

confidence: 59%

“…In fact, similar abnormal TMI phenomena were reported as early as 2019, and in recent years, there have been reports of increasing the TMI threshold by introducing higher order modes [89][90][91]. In [90], they believe that introducing higher-order modes without frequency shift from the fundamental mode (which will not affect TMI) can reduce the pump gain of higher-order modes with frequency shift from the fundamental mode (which will affect TMI), thereby increasing the TMI threshold. Theoretical research has proved that VCAF can balance SRS and TMI in high-power fiber lasers.…”

Section: Abnormal Tmi Suppression Methods Based On Fiber Coilingsupporting

confidence: 59%

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Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

Zeng

Wang

et al. 2023

Photonics

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Up to now, transverse mode instability (TMI) and stimulated Raman scattering (SRS) have become the main factors limiting the power scaling of conventional ytterbium-doped fiber laser. Many technologies are proposed to suppress the SRS or TMI individually, but most of them are contradictions in practical application. In this article, we focus on the technologies that can balance the suppression of both SRS and TMI, including fiber coiling optimization, pump wavelength optimization, pump configuration optimization, and novel vary core diameter active fiber. Firstly, we validate the effectiveness of these technologies in both theoretical and relatively low-power experiments, and introduce the abnormal TMI threshold increasing in a few-mode fiber amplifier with fiber coiling. Then, we scale up the power through various types of fiber lasers, including wide linewidth and narrow linewidth fiber lasers, as well as quasi-continuous wave (QCW) fiber lasers. As a result, we achieve 5~8 kW fiber laser oscillators, 10~20 kW wide linewidth fiber laser amplifiers, 4 kW narrow linewidth fiber amplifiers, and 10 kW peak power QCW fiber oscillators. The demonstration of these new technical schemes is of great significance for the development of high-power fiber lasers.

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Section: Abnormal Tmi Suppression Methods Based On Fiber Coilingsupporting

confidence: 59%

Section: Abnormal Tmi Suppression Methods Based On Fiber Coilingsupporting

confidence: 59%

Section: Abnormal Tmi Suppression Methods Based On Fiber Coilingsupporting

confidence: 59%

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Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

Zeng

Wang

et al. 2023

Photonics

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“…In our recent study [45], the TMI threshold is experimentally found to be closely related to the high-order mode (HOM) content of the seed laser. Further theoretical analysis indicated that by introducing incoherent HOM content (with the same frequency as the fundamental mode) into the fiber amplifier, the gain of anti-Stokes HOM (coherent HOM) in the amplifier could be suppressed through transverse mode competition, which leads to a weaker interference between the FM and coherent HOM, thus facilitating a higher TMI threshold.…”

Section: Controlling the Seed Laser's Mode Puritymentioning

confidence: 97%

New avenues for high-power high-brightness tandem-pumped fiber lasers

Xiao

et al. 2023

Advanced Fiber Laser Conference (AFL2022)

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The tandem pumping technique has been proven effective in power scaling of fiber lasers, which enabled the most powerful high-brightness fiber lasers to date. However, further performance improvement of tandem-pumped fiber lasers is challenged by the contradiction between nonlinearity suppression and good beam quality maintaining. To address these challenges, researchers from worldwide devoted to expediting the development of high-power tandem-pumped fiber lasers, and a series of new results and new applications emerged in recent years. This paper will highlight the recent advances in the enabling techniques of high-brightness tandem-pumped fiber lasers and the new applications of tandem pumping since the first review paper on this topic in 2017 [J. Opt. Soc. Am. B 34(3): A29-A36 (2017)]. A brief outlook on the further development of tandem pumping technique is also given.

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“…Fiber lasers have various applications owing to their high conversion efficiency, beam quality, compactness, and reliability 1 – 5 However, with an increase in the optical power, a series of unwanted nonlinear effects emerge. Specifically, stimulated Brillouin scattering (SBS) is the primary obstacle in scaling the power of narrow-linewidth lasers 6 , 7 .…”

Section: Introductionmentioning

confidence: 99%

Wavelength selective bending sensitive multi-ring fiber for suppressing stimulated Raman scattering

He,

Liao,

Wang

et al. 2024

Opt. Eng.

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Stimulated Raman scattering (SRS) must be suppressed owing to its adverse effect on high-power fiber lasers. We propose a bending-sensitive multi-ring fiber composed of three parts: a core, multiple high-refractive-index rings, and a cladding. Appropriate bending of the fiber produces a high loss of the first-order Raman Stokes wavelength at 1114 nm and low loss of the signal wavelength at 1064 nm, thus enabling the signal light to be confined to the core while maintaining singlemode transmission. This principle relies on the resonant coupling between the core and ring modes. Numerical analysis indicated that the loss ratio of the fundamental mode could reach 2650.041 by optimizing the structural parameters. Moreover, when the three-ring fiber was subjected to a bending radius of 6 cm, a bend-induced loss of the Raman wavelength reached 11.315 dB∕m, which effectively suppressed the first Stokes SRS generation.

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

Cited by 7 publications

References 46 publications

Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects

New avenues for high-power high-brightness tandem-pumped fiber lasers

Wavelength selective bending sensitive multi-ring fiber for suppressing stimulated Raman scattering

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