Single-mode large-mode-area Er-Yb fiber

Khudyakov, M. M.; Лобанов, А. С.; Lipatov, Denis S.; Bobkov, Konstantin K.; Aleshkina, Svetlana S.; Kochergina, Tatyana A.; Bubnov, M M; Абрамов, А. Н.; Vechkanov, N. N.; Guryanov, A. N.; Likhachev, Mikhail E.

doi:10.1117/12.2508547

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…A good splice between EYDF and passive fiber is quite important to keep the beam quality of the laser good and to lower loss. Due to the existence of pedestal in EYDF [24] and the large refractive index difference between EYDF and passive fiber, the splice is challenging. In our experiment, spliced heat is optimized to prevent light from entering the pedestal and to minimize loss.…”

Section: Expermental Results and Discussionmentioning

confidence: 99%

“…The measured pump absorption is actually smaller than true value. Since it is measured by removing and installing CLS after the main amplifier, signal in the fiber's pedestal can also be stripped [24], which makes pump absorption a little bit low. In general, the simulation results are relatively accurate.…”

Section: B Simulation Of In-band Pumped Eydf Amplifiermentioning

confidence: 99%

“…A higher concentration means that PIQ is more likely to occur. To suppress PIQ, Yb ion concentration and other components in EYDF should be optimized simultaneously[16,24,37], which is a high requirement for the manufacture of EYDF.Secondly, considering the ability to withstand high pump power, the core-to-cladding ratio of EYDF should be larger. Increasing core-to-cladding ratio can significantly improve pump absorption coefficient and laser efficiency.…”

mentioning

confidence: 99%

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A 301 W narrow-linewidth in-band pumped Er:Yb co-doped fiber amplifier at 1585 nm and related modeling for dynamics study and optimization

Fu,

Li,

et al. 2024

High Pow Laser Sci Eng

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To overcome Yb lasing, kilowatt-level 1535 nm fiber laser is utilized to in-band pump an Er:Yb co-doped fiber (EYDF) amplifier. An output power of 301 W narrowlinewidth EYDF amplifier operating at 1585 nm, with 3 dB bandwidth of 150 pm and 2 M <1.4, is experimentally demonstrated. To the best of our knowledge, it is the highest output power in L band narrow-linewidth fiber amplifiers with good beam quality.Theoretically, a new ion transition behavior among energy levels for in-band pumping EYDF is uncovered, and a spatial-mode-resolved nonlinearity-assisted theoretical model is developed to understand its internal dynamics. Numerical simulations reveal that the reduction in slope efficiency is significantly related to excited-state absorption (ESA). ESA has a nonlinear hindering effect on power scaling. It can drastically lower the pump

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Section: Expermental Results and Discussionmentioning

confidence: 99%

Section: B Simulation Of In-band Pumped Eydf Amplifiermentioning

confidence: 99%

mentioning

confidence: 99%

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A 301 W narrow-linewidth in-band pumped Er:Yb co-doped fiber amplifier at 1585 nm and related modeling for dynamics study and optimization

Fu,

Li,

et al. 2024

High Pow Laser Sci Eng

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Power scalability of a continuous-wave high-power Er-Yb co-doped fiber amplifier pumped by Yb-doped fiber lasers

Yan

Xiao

et al. 2021

Appl. Opt.

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The power scaling of Er-Yb co-doped fiber lasers and amplifiers has been limited by the bottleneck effect of energy-transfer saturation between Yb ions and Er ions. The emerging method of Er-Yb co-doped fiber amplifiers pumped by Yb-doped fiber lasers is considered as an approach to enhance the threshold of the bottleneck effect. In this paper, we quantitatively characterize the threshold of the bottleneck effect via the method of extreme value analysis of the second-order derivative. The method facilitates the optimization of the amplifier configuration. Afterward, we numerically investigate the bottleneck effect of various Er-Yb co-doped fiber amplifiers off-peak cladding-pumped by 10 × × n m Yb-doped fiber lasers for what we believe, to the best of our knowledge, is the first time. The result shows that the most optimal configuration is long gain fiber over 20 m pumped by a 1020–1025 nm fiber laser, with more than two times the output limit of a conventional laser diode pumping scheme. The essential factors of an amplifier are discussed afterward, including the pump-launching direction, the optimization of large-mode-area fiber, the core-cladding ratio, the concentration of doping ions, the nonlinearity limit, and the distribution of the heat load.

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All fiber combined Er/Er-Yb amplifier for efficient amplification of high peak power single frequency pulses

Khudyakov

Lipatov

Guryanov

et al. 2019

Laser Congress 2019 (ASSL, LAC, LS&C)

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Single-mode large-mode-area Er-Yb fiber

Cited by 3 publications

References 20 publications

A 301 W narrow-linewidth in-band pumped Er:Yb co-doped fiber amplifier at 1585 nm and related modeling for dynamics study and optimization

A 301 W narrow-linewidth in-band pumped Er:Yb co-doped fiber amplifier at 1585 nm and related modeling for dynamics study and optimization

Power scalability of a continuous-wave high-power Er-Yb co-doped fiber amplifier pumped by Yb-doped fiber lasers

All fiber combined Er/Er-Yb amplifier for efficient amplification of high peak power single frequency pulses

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