Thermal effects in high-power CW fiber lasers

Lapointe, Marc-André; Châtigny, Stéphane; Piché, Michel; Cain-Skaff, Michael; Maran, J.-N.

doi:10.1117/12.809021

Cited by 53 publications

(33 citation statements)

References 5 publications

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“…For high power laser systems, active fibre is typically placed in thermal contact with a cooled heatsink [15,16]. Figure 2(c) shows a simplified implementation of this, consisting of a water cooled aluminium plate with rectangular shaped trenches machined into the surface.…”

Section: Active Fibre and Heatsink Designmentioning

confidence: 99%

Metal clad active fibres for power scaling and thermal management at kW power levels

Daniel¹,

Simakov²,

Hemming³

et al. 2016

Opt. Express

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We present a new approach to high power fibre laser design, consisting of a polymer-free all-glass optical fibre waveguide directly overclad with a high thermal conductivity metal coating. This metal clad active fibre allows a significant reduction in thermal resistance between the active fibre and the laser heat-sink as well as a significant increase in the operating temperature range. In this paper we show the results of a detailed thermal analysis of both polymer and metal coated active fibres under thermal loads typical of kW fibre laser systems. Through several different experiments we present the first demonstration of a cladding pumped aluminium-coated fibre laser and the first demonstration of efficient operation of a cladding-pumped fibre laser at temperatures of greater than 400 °C. Finally, we highlight the versatility of this approach through operation of a passively (radiatively) cooled ytterbium fibre laser head at an output power of 405 W in a compact and ultralight package weighing less than 100 g.

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Section: Active Fibre and Heatsink Designmentioning

confidence: 99%

Metal clad active fibres for power scaling and thermal management at kW power levels

Daniel¹,

Simakov²,

Hemming³

et al. 2016

Opt. Express

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“…The parameters used in the calculations are given in Table 1. The heat load generated in the gain medium depends on the quantum defect and increases with pump, P pump [12]. The slope efficiency S of the rod fiber is included as a reasonable approximation for determining the heat load as a function of signal power, P signal .…”

Section: Thermally Induced Waveguide Perturbation and Mode Distributionsmentioning

confidence: 99%

Estimating modal instability threshold for photonic crystal rod fiber amplifiers

Johansen¹,

Laurila²,

Alkeskjold³

et al. 2013

Opt. Express

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Abstract:We present a semi-analytic numerical model to estimate the transverse modal instability (TMI) threshold for photonic crystal rod amplifiers. The model includes thermally induced waveguide perturbations in the fiber cross section modeled with finite element simulations, and the relative intensity noise (RIN) of the seed laser, which seeds mode coupling between the fundamental and higher order mode. The TMI threshold is predicted to ~370 W -440 W depending on RIN for the distributed modal filtering rod fiber.

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“…• C) [7] . The heat deposition density in the core has an upper limit that can be tolerated before the onset of coating damage.…”

mentioning

confidence: 99%

“…The thermal contact resistance per unit surface R ′′ tc (m 2 ·K/W) between the fiber and the heat sink can be expressed as [7] R…”

mentioning

confidence: 99%

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Efficient heat transfer in high-power fiber lasers

Fan¹,

He²,

Zhou³

et al. 2012

Chin. Opt. Lett.

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The maximum output power of fiber lasers limited by the thermal degradation of double-clad fiber coatings is theoretically simulated. We investigated the thermal effects on high-power continuous wave (CW) fiber lasers with a focus on heating at the splice joints as well as on the doped fiber caused by quantum defects. Whether thermal interface materials are used or not, the thermal contact resistances between the fiber and its heat sink are measured separately while using different cooling equipments. Though the thermal management of splices is more difficult than that of active fibers, a temperature increase of 0.019 K/W is obtained for a splice joint into which the pump light launches. The splice joint sustains 3 kW of total passing power.

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Thermal effects in high-power CW fiber lasers

Cited by 53 publications

References 5 publications

Metal clad active fibres for power scaling and thermal management at kW power levels

Metal clad active fibres for power scaling and thermal management at kW power levels

Estimating modal instability threshold for photonic crystal rod fiber amplifiers

Efficient heat transfer in high-power fiber lasers

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