Neodymium-doped laser yttrium oxide ceramics

The paper reports about the results of researches of nanopowder production with a help powerful repetitively pulsed CO 2 laser "LAERT" which generated radiation with pulse energy of ≈1 J, peak power of ≈8 kW and mean power of 500 W. Laser radiation affected and evaporated the target. The target material vapor condensed into nanoparticles as a result of intermixing vapor with a flow of cold gas. In basic the air of atmospheric pressure was used as the carrier gas. However in some experiments were used He and Ar and the gas pressure also was changed. In our experiments we produced nanopowders of such materials as: YSZ, YSZ:Al 2 O 3 , Al 2 O 3 , CeO 2 :Gd 2 O 3 , 0.5%Nd:Y 2 O 3 , 1%Nd:YAG, Fe 3 O 4 and carbon with a middle size 10÷30 nm. Received nanopowders were also weakly agglomerated. We carried out 3D numerical modeling of thermo-hydrodynamic processes occurred during the laser evaporation of a target. Results of calculations have cleared up many details of target evaporation. In particular, influence of liquid melt movement on stoichiometry of evaporation of a target from oxide mixes is found out. Results of calculations are in a good agreement with experimental data.Nanopowder, laser ablation.

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“…8 -Insertion). The technology of sintering was reported in paper [7]. X-ray analysis confirmed the garnet structure of the sample.…”

Section: Calculationssupporting

confidence: 52%

Synthesis of nanopowders with a help of powerful CO 2 laser

2010

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“…Nd‐doped laser material has been considered as an effective four energy‐level laser system due to low laser output threshold, large absorption and emission cross section, etc . Comparing with Nd: YAG, Nd: Y 2 O 3 transparent ceramic possesses broader transmission range, lower thermal expansion coefficient and higher thermal conductivity .…”

Section: Introductionmentioning

confidence: 99%

“…6,7 Nd-doped laser material has been considered as an effective four energy-level laser system due to low laser output threshold, large absorption and emission cross section, etc. [8][9][10][11] Comparing with Nd: YAG, 12 Nd: Y 2 O 3 transparent ceramic possesses broader transmission range, lower thermal expansion coefficient and higher thermal conductivity. [13][14][15] Owing to the inherent flexibility of the ceramic process allows the design of laser sources with complicated architectures, Y 2 O 3 ceramics can be heavily and homogeneously doped with Nd 3+ ion and no optically heterogeneous regions such as facets and cores occurs as seen in single crystals, so the absorption of the pump energy can be dramatically improved.…”

Section: Introductionmentioning

confidence: 99%

Structural and Thermo‐Mechanical Properties of Nd: Y₂O₃ Transparent Ceramics

Zhang

Pan

2015

J. Am. Ceram. Soc.

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Various content of neodymia Nd: Y2O3 (Nd: 0.5–5.0 at.%) transparent ceramics were fabricated by vacuum sintering. The prepared Nd: Y2O3 ceramics exhibit high transmittance (~80%) at the wavelength of 1100 nm. It is found that the increase in Nd concentration enhances the grain size growth, while decreases the phonon energy, which is benefit for improving both the luminescence quantum and up‐conversion efficiency. The thermal conductivity and thermal expansion coefficient of the transparent 1.0 at.% Nd: Y2O3 ceramic is 5.51 W·(m·K)−1 and 8.11 × 10−6 K−1, respectively. The hardness and the fracture toughness of the transparent ceramic is 9.18 GPa and 1.03 Mpa·m1/2, respectively. The results indicate that the Nd: Y2O3 transparent ceramic is a potential candidate material for laser.

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“…Significant progress has been made to improve the properties of ceramics through the transition to the nanotechnology, which implies obtaining simple nano-powders and complex oxides by different methods [27][28][29][30][31][32][33][34][35][36]. For example, obtaining nano-powders eased the technology of synthesis of optically transparent ceramics, which are used as optical windows with a wide range of transparency, as optical and luminescent elements, as magneto elements, or as active elements of solid-state lasers [33,34,[36][37][38][39]. Until recently, the main interest was focused on the development of technologies for the production of powders and ceramics based on binary eutectics as: Y 3 [44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Directed laser processing of compacted powder mixtures Al2O3-TiO2-Y2O3

Власова¹,

Kakazey²,

Aguilar³

et al. 2013

SCI SINTER

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The phase formation, microstructure and surface texture of laser treated ternary powder mixtures of Al2O3-TiO2-Y2O3 had been studied. Rapid high temperature heating and subsequent rapid cooling due to the directed movement of the laser beam forms concave ceramic tracks. Phase composition and microstructure of the tracks depends on the Al2O3 content and the TiO2/Y2O3 ratio of the initial mixtures. The main phases observed are Y3Al5O12, Y2Ti2O7, Al2O3 and Al2TiO5. Due to the temperature gradient in the heating zone, complex layered structures are formed. The tracks consist of three main layers: a thin surface layer, a layer of crystallization products of eutectic alloys, and a lower sintered layer. The thickness of the crystallization layer and the shrinkage of the irradiation zone depend on the amount of Y3Al5O12 and Al2O3 crystallized from the melt.

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Neodymium-doped laser yttrium oxide ceramics

Cited by 25 publications

References 1 publication

Synthesis of nanopowders with a help of powerful CO 2 laser

Synthesis of nanopowders with a help of powerful CO 2 laser

Structural and Thermo‐Mechanical Properties of Nd: Y₂O₃ Transparent Ceramics

Directed laser processing of compacted powder mixtures Al2O3-TiO2-Y2O3

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Neodymium-doped laser yttrium oxide ceramics

Cited by 25 publications

References 1 publication

Synthesis of nanopowders with a help of powerful CO 2 laser

Synthesis of nanopowders with a help of powerful CO 2 laser

Structural and Thermo‐Mechanical Properties of Nd: Y2O3 Transparent Ceramics

Directed laser processing of compacted powder mixtures Al2O3-TiO2-Y2O3

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Structural and Thermo‐Mechanical Properties of Nd: Y₂O₃ Transparent Ceramics