Single mode 43 kW output power from a diode-pumped Yb-doped fiber amplifier

Beier, Franz; Hupel, Christian; Kühn, Stefan; Hein, Sigrun; Nold, Johannes; Proske, Fritz; Sattler, Bettina; Liem, A.; Jáuregui, César; Limpert, Jens; Haarlammert, Nicoletta; Thomas, Sabu; Eberhardt, Ramona; Tünnermann, Andreas

doi:10.1364/oe.25.014892

Cited by 183 publications

(87 citation statements)

References 18 publications

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“…Figure 3 shows the total linear heat density generated at each point along the fiber, plotted for the example above at P p0 = 3500 W. The hottest point is at port 1 where the pump is injected (where the signal also takes its maximum value). The large value of the liner heat density clearly shows that the fiber must be water-cooled as is also the case in [35], where the fiber temperature rises ∆T ≈ 19 K above ambient, which is acceptable.…”

Section: A Heat Generation In a High-gain High-power Amplifiermentioning

confidence: 87%

Thermal modeling, heat mitigation, and radiative cooling for double-clad fiber amplifiers

et al. 2018

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We report a detailed formalism aimed at the thermal modeling and heat mitigation in high-power doubleclad fiber amplifiers. Closed form analytical formulas are developed that take into account the spatial profile of the amplified signal and pump in the double-clad geometry, the presence of the amplified spontaneous emission, and the possibility of radiative cooling due to anti-Stokes fluorescence emission. The formalism is applied to a high-power Yb-doped silica fiber amplifier. The contributions to the heat-load from the pump-signal quantum defect, as well as the pump and signal parasitic absorptions are compared to the radiative cooling. It is shown that for realistic cases, the local heat generation in kiloWatt-class fiber amplifiers is either dominated by the quantum defect or the parasitic absorption depending on the pump wavelength. In conventional designs, radiative cooling can be substantial only in properly designed amplifiers, when the pump power is tens of watts or lower, unless the parasitic absorption is reduced compared to the commonly reported values in the literature. We also explore the impact of the non-ideal quantum efficiency of the gain material. The developed formalism can be used to design fiber amplifiers and lasers for optimal heat mitigation, especially due to radiative cooling.

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Section: A Heat Generation In a High-gain High-power Amplifiermentioning

confidence: 87%

Thermal modeling, heat mitigation, and radiative cooling for double-clad fiber amplifiers

et al. 2018

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“…In this section, we study the suggested configuration of the C/C Yb-doped fiber amplifier which is inspired by a DC fiber amplifier described in Ref. [20] as its schematic is shown in Fig. 2.…”

Section: Core/cladding Yb-doped Fiber Amplifiermentioning

confidence: 99%

Heat mitigation of a core/cladding Yb-doped fiber amplifier using anti-Stokes fluorescence cooling

2019

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A Core/Cladding Yb-doped fiber amplifier configuration is presented that relies on anti-Stokes fluorescence cooling for effective heat mitigation in high-power operation. In the proposed design, the inner cladding of the double clad fiber is doped with the same ion as in the core; therefore, the excess heat generated from the background absorption is removed by the anti-Stokes fluorescence in both core and inner cladding. We consider both silica and ZBLAN glasses for the host material in the Core/Cladding Yb-doped fiber amplifier. The model incorporates the spatial profiles of the signal and pump intensities, as well as the amplified spontaneous emission. The total linear heat density and temperature distribution in the fiber amplifier are calculated. The results show that the anti-Stokes fluorescence cooling in the Core/Cladding Yb-doped configuration can mitigate the generated heat effectively in high-power operation, which obviates the need for an external cooling system. arXiv:1903.05738v3 [physics.optics]

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“…The power generated from optical fiber lasers and amplifiers has increased significantly over the past decade [1][2][3][4]. Consequently, efficient heat mitigation has become one of the main concerns, especially in light of recent reports of limitations in power scaling because of the thermally-induced mode instability, which degrades the output beam quality [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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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Single mode 43 kW output power from a diode-pumped Yb-doped fiber amplifier

Cited by 183 publications

References 18 publications

Thermal modeling, heat mitigation, and radiative cooling for double-clad fiber amplifiers

Thermal modeling, heat mitigation, and radiative cooling for double-clad fiber amplifiers

Heat mitigation of a core/cladding Yb-doped fiber amplifier using anti-Stokes fluorescence cooling

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

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