2.5 kW TMI-free co-pump Yb-doped fiber oscillator by 971.5 nm pumping wavelength

Rezaei-Nasirabad, Reza; Azizi, Saeed; Paygan, Danial; Tavassoli, Mohammad; Abedinajafi, Ali; Roohforouz, Ali; Chenar, Reza Eyni; Golshan, Ali Hamedani; Hejaz, Kamran; Vatani, Vahid

doi:10.1016/j.optlastec.2022.108652

Cited by 8 publications

(2 citation statements)

References 44 publications

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“…For these measures, there is still much work to be done before they are put into practical application. We can also optimize the signal and pump wavelengths to alleviate the quantum defect [53][54][55][56][57][58][59][60][61][62][63][64]. In addition, the pump absorption of the fiber can be optimized to reduce the temperature gradient in the fiber, inhibit the formation of long-period refractive index gratings, and suppress TMI.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

“…At present, the influence of pump wavelength on TMI reported by other groups is mostly theoretical analysis, lacking systematic experimental research [53,55,58,60,63]. In terms of fiber coiling, TMI is restrained by reducing the fiber coiling diameter [51].…”

Section: Introductionmentioning

confidence: 99%

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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3 kW forward-pumped fiber laser via pump recycler

et al. 2023

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We report a single-end forward-pumped fiber laser with a record high output power of 3 kW. The laser is assembled exclusively from commercially widespread components such as the Yb-doped fiber with core/cladding diameter of 20/400 µm, pump laser diodes at an emission wavelength of 915 nm, and a signal and pump fiber combiner that serves as the pump recycler. The record high power arises from the combination of the 915 nm pumping and pump recycler with an effective reflectivity of 78%, increasing simultaneously the thresholds for stimulated Raman scattering and transverse mode instability (TMI). The length of the oscillator was also varied experimentally from 20 m to 5 m, showing a contrast of up to 19% in the TMI threshold. This shows the importance of accurately partitioning the Yb-doped fiber length in between the oscillator and amplifier sections to minimize the impact of TMI.

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3 kW single-end forward-pumped fiber laser via pump recycler and oscillator length optimization

Lin

Bussières-Hersir²,

Auger³

et al. 2023

Cleo 2023

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2.5 kW TMI-free co-pump Yb-doped fiber oscillator by 971.5 nm pumping wavelength

Cited by 8 publications

References 44 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

3 kW forward-pumped fiber laser via pump recycler

3 kW single-end forward-pumped fiber laser via pump recycler and oscillator length optimization

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