Development and thermal management of 10kW CW, direct diode laser source

Zhu, Hao; Hao, Mingming; Zhang, Jianwei; Ji, Wenyu; Lin, Xingchen; Zhang, Jinsheng

doi:10.1016/j.optlastec.2015.08.001

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…The temperature gradient G and solidification rate R are two important parameters that influence the microstructure and properties of the cladding layer such as grain size, grain morphology, and microhardness [4]. The morphology of the grains after solidification changes in sequence from planar, to cellular, cellular dendrite, and columnar dendrite, and then to equiaxed dendrite as the ratio of R/G is increasing.…”

Section: Temperature Gradient and Solidification Ratementioning

confidence: 99%

“…Recent development of the high power direct diode lasers (HPDDL) is opening new opportunities for localized material surface modifications [3]. HPDDL is characterized by high electrical efficiency, high absorption rate, and low maintenance cost [4]. Moreover, the top-hat distribution of the laser beam produces a more uniform microstructure with a smaller heat affected zone (HAZ) [5].…”

Section: Introductionmentioning

confidence: 99%

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Laser cladding of 420 stainless steel with molybdenum on mild steel A36 by a high power direct diode laser

2016

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Laser cladding, as one of the most promising surface modification technologies, is being widely applied in industry to improve the wear and corrosion resistance of components. The high energy input and high cooling rate during the cladding process lead to severe metallurgical reactions that determine the microstructure and properties of the cladded layer. In this study, a 3-dimensional (3-D) finite element (FE) model was developed to study heat transfer during laser cladding of 420 stainless steel+ 4% molybdenum on mild steel A36. In this model, the effects of laser-powder interaction, temperature-dependent material properties, latent heat, and Marangoni flow were considered. A method based on mass balance was adopted to predict the clad geometry. The thermal results such as the temperature history, temperature gradient, and solidification rate were investigated. Based on the simulated thermal results, the microstructure and Mo distribution in the clad layer were studied. In order to verify the established model, a series of experiments was conducted by using an 8-kW high-power direct diode laser (HPDDL). Thermocouples and a CCD camera were used to monitor the temperature history and molten pool size. The predicted clad height and width showed a good agreement with the experimental results.

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Section: Temperature Gradient and Solidification Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser cladding of 420 stainless steel with molybdenum on mild steel A36 by a high power direct diode laser

2016

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“…Eq. (1) indicates that the combination of high VBG feedback and low front facet reflectance is beneficial to spectrum locking. We take the emitter with a wavelength of 976 nm as an example.…”

Section: Optimizing Of External Cavity Parametersmentioning

confidence: 99%

“…Due to the advantages of excellent electro-optical (E-O) conversion efficiency and high output power, direct diode laser sources are desired in many industrial applications, either direct processing applications [1], or pumping other types of lasers [2], [3]. However, because of brightness limitations, diode laser sources are still not capable to be applied in many aspects of applications, such as fine processing.…”

Section: Introductionmentioning

confidence: 99%

Development and Thermal Management of kW-Class High-Power Diode Laser Source Based on the Structure of Two-Stage Combination

et al. 2019

Self Cite

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In this paper, we present an optical structure for two-stage beam combination to realize a high-power fiber-coupled diode laser source. In the first stage, dense spectral combination based on reflecting volume Bragg gratings is implemented for combining five diode laser blocks with a spectral separation of 1.5 nm, to a high output power submodule. In the second stage, submodules are further coaxially multiplexed by polarization beam combination and coarse spectral combination to obtain a higher output power. In the process of the beam combination, thermal effects of combining elements are also investigated. By using a temperature control, the diode laser source can steadily produce 3120-W power from an optical fiber with 105-μm core diameter and 0.2 numerical aperture. This paper demonstrates the benefits of this combination structure and the effectiveness of the temperature control.

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“…Therefore, laser lighting still faces the problem of heat dissipation under high-power density. For the laser light source, a variety of heat dissipation methods have been developed, including microchannels, heat pipes, forced air cooling, and double heat sinks [28][29][30][31][32]. Though, at present, there are reliable means to dissipate the heat of a laser light, phosphor converters are still facing the challenge of heat dissipation.…”

Section: Introductionmentioning

confidence: 99%

A Luminous Efficiency-Enhanced Laser Lighting Device with a Micro-Angle Tunable Filter to Recycle Unconverted Blue Laser Rays

Ding

Qian

et al. 2021

Micromachines

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In this work, a phosphor converter with small thickness and low concentration, based on a micro-angle tunable tilted filter (ATFPC), was proposed for hybrid-type laser lighting devices to solve the problem of silicone phosphor converters’ carbonizing under high-energy density. Taking advantage of the filter and the scattering characteristics of microphosphors, two luminous areas are generated on the converter. Compared with conventional phosphor converters (CPCs), the lighting effects of ATFPCs are adjustable using tilt angles. When the tilt angle of the micro filter is 20°, the luminous flux of the ATPFCs is increased by 11.5% at the same concentration; the maximum temperature (MT) of ATFPCs is reduced by 22.8% under the same luminous flux and the same correlated color temperature (CCT) 6500 K. This new type of lighting device provides an alternative way to improve the luminous flux and heat dissipation of laser lighting.

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Development and thermal management of 10kW CW, direct diode laser source

Cited by 19 publications

References 15 publications

Laser cladding of 420 stainless steel with molybdenum on mild steel A36 by a high power direct diode laser

Laser cladding of 420 stainless steel with molybdenum on mild steel A36 by a high power direct diode laser

Development and Thermal Management of kW-Class High-Power Diode Laser Source Based on the Structure of Two-Stage Combination

A Luminous Efficiency-Enhanced Laser Lighting Device with a Micro-Angle Tunable Filter to Recycle Unconverted Blue Laser Rays

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