Thermal effects in kilowatt all-fiber MOPA

Fan, Yuanyuan; He, Bing; Zhou, Jun; Zheng, Jituo; Liu, Houkang; Wei, Yunrong; Dong, Junping; Lou, Qihong

doi:10.1364/oe.19.015162

Cited by 96 publications

(52 citation statements)

References 16 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 temperature rise can be large and result in the changes of absorption cross section. An analysis of temperature distribution is conducted according to the theoretical model reported [9] . A rate equation model is developed to calculate the pump and laser power distribution along the fiber length.…”

Section: Temperature Dependent Absorptionmentioning

confidence: 99%

Single-mode linearly polarized high power fiber laser at 1120 nm

Wang

Zhang

et al. 2012

SPIE Proceedings

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A 100 W-class all-fiber linearly-polarized single-mode fiber laser at 1120 nm with an optical pump efficiency of 50% was demonstrated. Linearly polarized output with a polarization extinction ratio of 15 dB is achieved by a cavity that selects both wavelength and polarization. Macro pulse operations with square shaped pulses from 100 μs to 1 ms are achieved without relaxation oscillation. The exact wavelength of pump diode is found to be crucial for amplified spontaneous emission and parasitic oscillation in high power 1120 nm fiber laser. Effects of inhomogeneous spectral broadening and temperature dependent absorption are proposed to explain experimental observations.

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“…Although the intrinsic large surfaceto-active-volume ratio of fibers has direct and indirect advantages to heat dissipation, the use of shorter fibers with higher thermal loading densities in kW fiber lasers requires careful thermal management [4−7] . Polymer coatings needed for fiber handling have low thermal stability and are the primary limiting factors for heat load in the fiber [8] . Therefore, the thermal management of polymer coatings greatly influences the maximum output power and reliability.…”

mentioning

confidence: 99%

“…Although previous works have proposed the use of thermal contact resistance to analyze the thermal effects of kW-level fiber lasers [8,9] , they do not use thermal interface materials (TIMs). Given that TIMs are used to minimize the thermal contact resistance between two rigid surfaces [10] , the significant power increase in fiber lasers raises a need for improved TIMs that allows efficient heat transfer across the fiber-heat sink interface, thus reducing thermal contact resistance.…”

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 kilowatt all-fiber MOPA

Cited by 96 publications

References 16 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

Single-mode linearly polarized high power fiber laser at 1120 nm

Efficient heat transfer in high-power fiber lasers

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