Most efficient simultaneous solar laser emissions from three Ce:Nd:YAG rods within a single pump cavity

Liang, Dawei; Vistas, Cláudia R.; Garcia, Dário; Tibúrcio, Bruno D.; Catela, Miguel; Costa, Hugo; Guillot, Emmanuel; Almeida, Joana

doi:10.1016/j.solmat.2022.111921

Cited by 39 publications

(58 citation statements)

References 28 publications

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“…The effect of high thermal load could be prevented by using a cylindrical fused silica homogenizer 6,7,23 instead of that lens. Alternatively, the heat load problem can be solved with multirod configurations 24,25 or using an end-side pumping configuration but with a small diameter rod and small effective collection area. 26 Thus, the results of this study demonstrate that when the aforementioned conditions are met, using Ce:Nd:YAG as an alternative to Nd: YAG in a combined end-side pumping configuration could increase the laser output by >1.5 times.…”

Section: Discussionmentioning

confidence: 99%

Influence of thermal population of lower laser levels on the performance of end-side-pumped Ce:Nd:YAG solar laser

Payziyev

Sherniyozov

2022

J. Photon. Energy

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.We report the results of a theoretical study of the combined end-side pumped solar lasers to solve the problem associated with a recent experimental finding where the unexpected underperformance of the Ce doped Nd:YAG lasers in comparison to pure Nd:YAG lasers was observed. For this, we have developed a theoretical model based on space-dependent rate equations, which considers the effect of the thermal population of the laser levels on the laser output. It is shown that the main reason for the lower laser performance of recently experimentally realized Ce:Nd:YAG solar laser in the end-pumped regime and the fracture of the Ce:Nd:YAG rod at the process is the excessively high thermal load on the end of the laser rod. As a result of our study, we propose easily-feasible solutions based on optimal pumping and cooling configurations. The results of this study also demonstrate that under the necessary conditions, using Ce:Nd:YAG as an alternative to Nd:YAG in the combined end-side pumping configuration could increase the laser output by more than 1.5 times.

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Section: Discussionmentioning

confidence: 99%

Influence of thermal population of lower laser levels on the performance of end-side-pumped Ce:Nd:YAG solar laser

Payziyev

Sherniyozov

2022

J. Photon. Energy

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“…e most efficient conversion efficiency from solar light to laser (conversion efficiency of 4.64%, collection efficiency of 41.25 W/m 2 ) by using Ce/Nd : YAG has been reported [44]. Also, a slope efficiency of 7.64% for using multi-Ce/Nd : YAG rod and 4.5% for using a single Ce/Nd : YAG rod has been achieved [45].…”

Section: Introductionmentioning

confidence: 95%

“…On the other hand, Ce-doped Nd : YAG lasers have been developed [39][40][41][42][43][44][45]. Laser oscillation with end-side solar pumping has been performed.…”

Section: Introductionmentioning

confidence: 99%

Rod-Type Ce/Cr/Nd : YAG Ceramic Lasers with White-Light Pump Source

Saiki

Iwashita

Sakamoto

et al. 2022

International Journal of Optics

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Ceramic is promising for use as a solid-laser material pumped with solar or lamp light. We developed a Cr3+ ion doped Nd : YAG ceramic laser that converts white light into near-infrared laser light more efficiently. Investigation of its optical properties has revealed that large gain can be realized with excitation power that is one order of magnitude less than that in the case of Nd : YAG. Ce3+ ion doping also makes it possible to utilize the excitation light components with wavelengths of 350 nm or less, preventing generation of color centers. A rod-type Ce3+/Cr3+/Nd : YAG ceramic pumped by white light such as solar light or flash lamp light was developed. Fluorescence lifetime of ceramic was measured. Laser oscillations at free running mode were observed. Also, numerical calculation for output laser power and gain at lasing threshold was performed. Fluorescence lifetime increased as temperature rose, which was observed in Cr/Nd : YAG ceramic. This increase suggests the existence of a cross-relaxation effect. Maximum output laser energy of 73 mJ with the peak power of 330 W was obtained. Obtained output laser energy was around twice more than that in case of Cr3+/Nd : YAG ceramic with the same Nd and Cr ion concentration.

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“…To circumvent hindrances, such as laser beam distortion and rod fracture, the potential of multirod solar-pumped laser systems has been investigated 24 – 33 In these systems, each rod absorbs a portion of the total concentrated solar radiation, leading to less thermal load and waning effects of thermal lensing and thermal stress problems. With the paramount importance of the multirod scheme scalability in mind, multirod laser stations have been proposed for megawatt solar furnaces (MWSFs), namely the ones being operated in Uzbekistan 24 and in France 29 , 30 , 32 .…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, an alternative multirod solar laser station with a side-pumping configuration is presented here to improve the solar-to-laser power conversion efficiency in systems for the PROMES-CNRS. Because the external annular area of the parabolic mirror makes the solar rays reach the focal spot at high angles, ending up almost being unutilized for rod pumping, 18 , 23 , 27 , 33 , 36 – 41 18 out of 63 heliostats were selected to collect about a third of 1 MW and illuminate the most central part of the parabolic mirror. A 2D-CPC further concentrated the solar rays, promoting their passage through multiple core-doped Nd:YAG rods, which were positioned after it.…”

Section: Introductionmentioning

confidence: 99%

Multirod approach to enhance solar-to-laser conversion efficiency in the Odeillo solar furnace

et al. 2022

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.A multirod solar laser station for the megawatt solar furnace (MWSF) in Odeillo, France, was conceptualized and numerically studied to improve the solar-to-laser power conversion efficiency. 18 heliostats from the 63-heliostat field were selected, and 347 kW of solar power was obtained at its focus. From there, a two-dimensional compound parabolic concentrator further concentrated and redistributed the solar rays toward 11 core-doped Nd:YAG rods, each fixed inside a fused silica flow tube. 11.40 kW of total multimode laser power was calculated, corresponding to a 3.29% solar-to-laser power conversion efficiency. This efficiency value represents an enhancement of 1.70 and 1.26 times over that attained from single-rod solar laser systems in side-pumping configuration tested in Odeillo, France, in which Nd:YAG rods were codoped with Cr3 + and Ce3 + ions, respectively. It was also 1.44 times higher than that obtained by a previously proposed side-pumping scheme with a solar flux homogenizer and 12 Nd:YAG rods for the same MWSF.

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Most efficient simultaneous solar laser emissions from three Ce:Nd:YAG rods within a single pump cavity

Cited by 39 publications

References 28 publications

Influence of thermal population of lower laser levels on the performance of end-side-pumped Ce:Nd:YAG solar laser

Influence of thermal population of lower laser levels on the performance of end-side-pumped Ce:Nd:YAG solar laser

Rod-Type Ce/Cr/Nd : YAG Ceramic Lasers with White-Light Pump Source

Multirod approach to enhance solar-to-laser conversion efficiency in the Odeillo solar furnace

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