Luminescence sensitization properties of Ce: Nd: YAG materials for solar pumped lasers

Payziyev, Sh.; Sherniyozov, A.A.; Bakhramov, S. A.; Zikrillayev, Kh.; Khalikov, G.A.; Makhmudov, Kh.; Исмайлов, М. И.; Payziyeva, D.E.

doi:10.1016/j.optcom.2021.127283

Cited by 18 publications

(8 citation statements)

References 13 publications

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“…The authors of the work 6 proposed Ce:Nd:YAG crystal for solar lasers as an alternative to the widely used Nd:YAG claiming power-to-power efficiency can be doubled in a pumping configuration with a fused silica light guide homogenizer, 7 due to the excellent sensitizing characteristics of Ce ions in Ce:Nd:YAG. 8 However, despite all this, the first experiments carried out recently 9 showed that with a combined (end-side pumping) scheme of pumping Ce:Nd:YAG by solar radiation, it was possible to obtain only 6W, while Nd:YAG gave about 10 W at the same pumping conditions. The authors also note that when the pump power reached ∼600 W, the front end of the Ce:Nd:YAG crystal was fractured due to the high thermal load, while the fracture threshold for Nd:YAG was ∼1500 W. 10 The authors attribute this to the possible scattering losses in used Ce:Nd:YAG crystals.…”

Section: Introductionmentioning

confidence: 99%

“…Their numerical results showed that combinations of the Nd:YAG and Cr:LiCAF active media for configurations with transverse and longitudinal pumping significantly increase the pumping efficiency of the Nd:YAG active medium in both cases. The authors of the work 6 proposed Ce:Nd:YAG crystal for solar lasers as an alternative to the widely used Nd:YAG claiming power-to-power efficiency can be doubled in a pumping configuration with a fused silica light guide homogenizer, 7 due to the excellent sensitizing characteristics of Ce ions in Ce:Nd:YAG 8 . However, despite all this, the first experiments carried out recently 9 showed that with a combined (end-side pumping) scheme of pumping Ce:Nd:YAG by solar radiation, it was possible to obtain only 6W, while Nd:YAG gave about 10 W at the same pumping conditions.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…The Ce:Nd:YAG active medium has already demonstrated the potential to increase the efficiency of broadband-pumped lasers, compared with the Nd:YAG crystal [28][29][30][31][32] because of its strong absorption in ultraviolet (UV) and visible spectral regions at broadband light pumping and efficient energy transfer from Ce 3+ to Nd 3+ . The solar irradiance spectrum, the Nd:YAG and Ce:Nd:YAG absorption spectra, and the Ce:YAG fluorescence spectrum are represented in Figure 1.…”

Section: Optical Spectra and Energy Transfer From Ce 3+ To Nd 3+ Ions...mentioning

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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“…2 Later, the Ce:Nd:YAG laser crystal was experimentally tested for the first time in an end-side-pumped solar laser configuration, but it reported inferior performance. 3 This prompted further studies, where authors investigated the sensitization properties of Ce:Nd:YAG 4 and thoroughly examined thermal effects in another study, 5 concluding that Ce:Nd:YAG is expected to perform better in comparison with Nd:YAG lasers. Finally, in a milestone experimental work, a significant advancement in the Ce:Nd:YAG solar laser performance using a side-pumping configuration was reported, 6 as expected.…”

Section: Introductionmentioning

confidence: 99%

Solar-pumped composite YAG/Ce:Nd:YAG/YAG laser with reduced thermal effects

Payziyev,

Sherniyozov,

Bakhramov

et al. 2024

J. Photon. Energy

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This study reports experimental test results on a solar-pumped laser that utilizes composite YAG/Ce:Nd:YAG/YAG/rod with a diameter of 3 mm. We measured an output power of 8.5 W with optical-to-optical conversion efficiency of 1.43% in multimode operation when the laser was exposed to an incoming solar power of 593 W at an irradiance of 900 W∕m 2 . The YAG/Ce:Nd:YAG/YAG composite laser rod withstood the severe conditions of solar end-pumping for several hours of testing without any negative effects or degradation of laser output over time. To interpret and comprehensively analyze the experimental results, we developed a simulation model based on our experimental setup and conducted calculations with taking into account thermal population of lower laser levels. Simulation calculations show that a small deviation from a straight line in the experimental input-output dependence is a consequence of the weak influence of thermal population of the lower laser levels. To compare with recent achievements with conventional laser rods of comparable sizes and to formulate some useful recommendations when using composite crystals in future studies, we carried out additional numerical experiments taking into account possible optimizations, which do not affect in any way the thermal load on the front part of the laser rod considered in this experiment. The numerical studies demonstrate that solar-to-laser power conversion efficiency of 4.0% is achievable with a 3 mm laser rod when the solar input power is about 600 W. We also discuss the influence of rod size and thermal effects on conversion efficiency. Based on the findings of this study, we conclude that employing laser media composed of a single or multirod system with a composite structure could potentially offer an optimal solution to the thermal challenges inherent in solar-pumped solid-state lasers.

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Luminescence sensitization properties of Ce: Nd: YAG materials for solar pumped lasers

Cited by 18 publications

References 13 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

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

Solar-pumped composite YAG/Ce:Nd:YAG/YAG laser with reduced thermal effects

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