5.5 W continuous-wave TEM00-mode Nd:YAG solar laser by a light-guide/2V-shaped pump cavity

Almeida, Joana; Liang, Dawei; Vistas, Cláudia R.; Bouadjemine, R.; Guillot, Emmanuel

doi:10.1007/s00340-015-6257-z

Cited by 26 publications

(21 citation statements)

References 20 publications

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“…Similar to our previous solar laser schemes, [20][21][22][23][24][25][26][27][28][29] all the aforementioned design parameters of the seven-rod scheme were first optimized by nonsequential ray-tracing Zemax ® software to achieve the maximum absorbed pump power by each laser rod, while ensuring an efficient redistribution of pump light to each one. The standard solar spectrum for one-and-a-half air mass (AM1.5) 45 was used as the reference data for consulting the spectral irradiance (Wm −2 nm −1 ) at each wavelength of the solar spectrum.…”

Section: Modeling Of the Optical Design Parameters Through Zemax ® Ray Tracingmentioning

confidence: 99%

“…5) when compared to the classical single-rod/single-beam solar pumping schemes. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] Thus the mode-matching will be much less sensitive to the variation of both solar power and resonator length and, consequently, stable TEM 00 -mode solar laser emission may be observed.…”

Section: Modeling Of the Laser Resonator Parameters Through Lascad™mentioning

confidence: 99%

“…Substantial improvement in solar laser beam quality had only been possible by pumping small diameter laser rods within a large-mode volume resonator configuration, enabling efficient extraction of fundamental TEM 00 -mode solar laser. [21][22][23][24][25][26] Since the laser rod acts as an aperture, high-order resonator modes can be suppressed by pumping laser rods of small diameter. Consequently, beam quality improves, but with the loss of efficiency as a counterpart.…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons, since the first TEM 00 -mode solar laser emission, 21 our research team has been insisting on improving its solar laser collection efficiency. [22][23][24][25][26] For that purpose, parabolic mirrors have been used as primary concentrators, since they can concentrate the sunlight into a small focal spot without chromatic or spherical aberration, thus pumping more efficiently a small diameter laser rod. In 2017, 7.9 W∕m 2 TEM 00 -mode solar laser collection efficiency was reached by end-side-pumping a 1.0 at.…”

Section: Introductionmentioning

confidence: 99%

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Seven-rod pumping concept for simultaneous emission of seven TEM00-mode solar laser beams

et al. 2020

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In present-day single-rod/single-beam solar laser systems, the thermal lens effect is a serious issue that limits its ability for a scale-up to higher powers and improved beam quality. Aiming at resolving this shortcoming, the concept of a seven-rod/seven-beam solar pumping scheme is proposed. This scheme was composed of a first-stage heliostat-parabolic mirror system and a single large laser head. The large laser head consisted of seven fused silica compound parabolic concentrators, which transmitted and focused the concentrated solar radiation to each single-laser rod of small diameter, within a conical cavity, which enabled multiple passages of the pump rays. Consequently, each laser rod was pumped by only one-seventh of the total concentrated solar power, ensuring a significant reduction of the thermal induced effects in the laser rods. 13.3 W∕m 2 TEM 00 -mode solar laser collection efficiency was numerically achieved, representing an enhancement of 1.68 times over the experimental record from a single-rod prototype. 1.80 times improvement in solar-to-TEM 00 -mode laser power conversion efficiency was also registered in relation to the previous experimental record.

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Section: Modeling Of the Optical Design Parameters Through Zemax ® Ray Tracingmentioning

confidence: 99%

Section: Modeling Of the Laser Resonator Parameters Through Lascad™mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seven-rod pumping concept for simultaneous emission of seven TEM00-mode solar laser beams

et al. 2020

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“…Nevertheless, in both these schemes, the thermal lensing was still very pronounced in the large diameter rods, so operating with rods with smaller diameter was not possible. The maximum extraction of TEM 00 -mode solar laser is only conceivable by adopting laser rods of small diameter and resonator configurations of large-mode volume, which leads to a substantial improvement of the laser beam quality [16,[40][41][42][43][44]. Gaussian TEM 00 -mode laser beams are desired for many applications due to having the lowest divergence and, consequently, the highest intensity and brightness, allowing greater energy concentration for long distances [18].…”

Section: Introductionmentioning

confidence: 99%

Zigzag Multirod Laser Beam Merging Approach for Brighter TEM00-Mode Solar Laser Emission from a Megawatt Solar Furnace

Costa¹,

Almeida²,

Liang³

et al. 2021

Energies

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An alternative multirod solar laser end-side-pumping concept, based on the megawatt solar furnace in France, is proposed to significantly improve the TEM00-mode solar laser output power level and its beam brightness through a novel zigzag beam merging technique. A solar flux homogenizer was used to deliver nearly the same pump power to multiple core-doped Nd:YAG laser rods within a water-cooled pump cavity through a fused silica window. Compared to the previous multibeam solar laser station concepts for the same solar furnace, the present approach can allow the production of high-power TEM00-mode solar laser beams with high beam brightness. An average of 1.06 W TEM00-mode laser power was numerically extracted from each of 1657 rods, resulting in a total of 1.8 kW. More importantly, by mounting 399 rods at a 30° angle of inclination and employing the beam merging technique, a maximum of 5.2 kW total TEM00-mode laser power was numerically extracted from 37 laser beams, averaging 141 W from each merged beam. The highest solar laser beam brightness figure of merit achieved was 148 W, corresponding to an improvement of 23 times in relation to the previous experimental record.

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Brief History of Solar-Pumped Lasers

Almeida

2023

Green Energy and Technology

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5.5 W continuous-wave TEM00-mode Nd:YAG solar laser by a light-guide/2V-shaped pump cavity

Cited by 26 publications

References 20 publications

Seven-rod pumping concept for simultaneous emission of seven TEM00-mode solar laser beams

Seven-rod pumping concept for simultaneous emission of seven TEM00-mode solar laser beams

Zigzag Multirod Laser Beam Merging Approach for Brighter TEM00-Mode Solar Laser Emission from a Megawatt Solar Furnace

Brief History of Solar-Pumped Lasers

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