Stable TEM 00 -mode Nd:YAG solar laser operation by a twisted fused silica light-guide

Bouadjemine, R.; Liang, Dawei; Almeida, Joana; Mehellou, Said; Vistas, Cláudia R.; Kellou, A.; Guillot, Emmanuel

doi:10.1016/j.optlastec.2017.06.003

Cited by 16 publications

(5 citation statements)

References 26 publications

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“…Some literatures [1][2][3]6,7,9,[21][22][23][24][25][26][27][28][29] were made for the solar-laser efficiency improvement, whereas others included laser beam quality enhancements. 11,[26][27][28][30][31][32][33][34][35] Research details will be given for both multimode and monomode (fundamental-mode) solar-laser operations, respectively.…”

Section: Summary Of Research Details For Exhibitingmentioning

confidence: 99%

Thermal loading effects on Nd:YAG solar-laser performance in end-pumping and side-pumping configurations: a review

et al. 2018

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Section: Summary Of Research Details For Exhibitingmentioning

confidence: 99%

Thermal loading effects on Nd:YAG solar-laser performance in end-pumping and side-pumping configurations: a review

et al. 2018

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“…Two commonly used methods for solar pumping are side-pumping [12][13][14] and endside-pumping [6,11,15,16]. Side-pumping offers the advantage of distributing the absorbed power more evenly along the axis of the laser rod, thereby mitigating thermal lensing concerns.…”

Section: Introductionmentioning

confidence: 99%

“…The Ce:Nd:YAG medium has been evaluated for use in solar lasers in both end-sidepumping [17][18][19] and side-pumping [13,14] setups. In 2022, Garcia et al employed a parabolic mirror with a small collection area of 0.293 m 2 to pump a thin Ce:Nd:YAG rod with a 2.5 mm diameter and 25 mm length, achieving a high collection efficiency of 38.22 W/m 2 , along with solar-to-laser power conversion and slope efficiencies of 6.02% and 9.9%, respectively, at the primary concentrator's focus [17].…”

Section: Introductionmentioning

confidence: 99%

Efficient Production of Doughnut-Shaped Ce:Nd:YAG Solar Laser Beam

Garcia,

Liang,

Almeida

et al. 2023

Sustainability

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Laser beams with a doughnut-shaped profile have garnered much attention for their contribution to trapping nanoparticles and improving the scanning speed during laser-based 3D metal printing. For this reason, the production of a doughnut-shaped solar laser beam by end-side pumping a Ce:Nd:YAG rod with a small reflective parabolic collector was investigated. The resultant beam profile shape depended on the absorbed solar power, displaying a TEM00-mode profile at elevated input power. This phenomenon was primarily attributed to the role of distributing energy around the central region of the crystal. In contrast, at lower input power, a doughnut-shaped beam emerged, characterized by minimal energy distribution at the center. Through experiments conducted with a collection area of 0.226 m2 and a nominal solar irradiance from 970 W/m2 to 1000 W/m2, it was demonstrated that sufficient energy was available to generate a doughnut-shaped beam with a solar laser collection efficiency of 5.96 W/m2, surpassing previous measurements by 1.32 times. Further research with a larger collection area of 0.332 m2 and a diverse solar irradiance range of 650 W/m2 to 800 W/m2 revealed that the presence of a thin layer of cloud caused a transition from a doughnut-shaped to a TEM10-mode and, eventually, a TEM00-mode as the absorbed input solar power increased. Notably, under heavier cloud cover, the laser beam exhibited deformation at low input power instead of maintaining a doughnut-shaped profile. This research significantly enhances our comprehension of doughnut-shaped solar laser beams and their reliance on solar energy. By harnessing the plentiful and readily accessible energy from the Sun, the incorporation of solar energy into the realm of solar-pumped lasers holds immense promise for promoting sustainability. This transformative utilization can progressively diminish the industry’s carbon footprint, yielding long-term environmental benefits.

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“…Tertiary concentrators, such as 2D compound parabolic concentrators (CPCs), 3D CPCs, and V-shaped pump cavities, are also indispensable for high-flux pumping of the laser medium since they can either compress or wrap the concentrated solar radiation from their input aperture to the laser-active medium. Two most widely used methods of solar pumping are end-side-pumping [9][10][11][12][13][14][15][16][17] and side-pumping [8,[18][19][20][21][22][23]. Although the end-side-pumping approach allows greater laser efficiency, the distribution of pump light is non-uniform, which may lead to serious Energies 2022, 15, 3577 2 of 12 thermal loading problems [12].…”

Section: Introductionmentioning

confidence: 99%

“…Although the side-pumping configuration may allow a more uniform light distribution along the rod compared with the end-side-pumping configuration it is the secondary concentrator that plays a fundamental role in the distribution and uniformization of the light rays. The two most used secondary concentrators in side-pumped solar lasers are the fused silica aspherical lens [13,14,18,23] and fused silica light guide [19,21,22]. Even though these concentrators have been frequently applied in solar laser prototypes, a comparative study between them to evaluate their performance on solar lasers is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Uniform and Non-Uniform Pumping Effect on Ce:Nd:YAG Side-Pumped Solar Laser Output Performance

et al. 2022

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The Ce:Nd:YAG is a recent active medium in solar-pumped lasers with great potential. This study focuses on the influence of two secondary concentrators: a fused silica aspherical lens and a rectangular fused silica light guide; and consequent pump light distribution on the output performance of a Ce:Nd:YAG side-pumped solar laser. The solar laser head with the aspherical lens concentrated the incident pump light on the central region of the rod, producing the highest continuous-wave 1064 nm solar laser power of 19.6 W from the Ce:Nd:YAG medium. However, the non-uniformity of the absorbed pump profile produced by the aspherical lens led to the rod fracture because of the high thermal load, limiting the maximum laser power. Nevertheless, the solar laser head with the light guide uniformly spread the pump light along the laser rod, minimizing the thermal load issues and producing a maximum laser power of 17.4 W. Despite the slight decrease in laser power, the use of the light guide avoided the laser rod fracture, demonstrating its potential to scale to higher laser power. Therefore, the pumping distribution on the rod may play a fundamental role for Ce:Nd:YAG solar laser systems design.

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Stable TEM 00 -mode Nd:YAG solar laser operation by a twisted fused silica light-guide

Cited by 16 publications

References 26 publications

Thermal loading effects on Nd:YAG solar-laser performance in end-pumping and side-pumping configurations: a review

Thermal loading effects on Nd:YAG solar-laser performance in end-pumping and side-pumping configurations: a review

Efficient Production of Doughnut-Shaped Ce:Nd:YAG Solar Laser Beam

Uniform and Non-Uniform Pumping Effect on Ce:Nd:YAG Side-Pumped Solar Laser Output Performance

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