Relationship between formation of radiation color centers and growth defects in YAG:Nd crystals

Kovaleva, N. S.; Иванов, А. П.; Dubrovina, É. P.

doi:10.1070/qe1981v011n11abeh008633

Cited by 8 publications

(3 citation statements)

References 4 publications

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“…The mutual relation between different types of defects is determined by technological conditions such as purity of raw materials, growth parameters (rotation and pulling rate), temperature conditions in the crystalmelt interface and growth atmosphere. At the present time the processes of SCC and TCC formation, their origin and correlation with technological conditions are mainly studied in YAG:Nd and YAP:Nd [14,15]. In the case of GGG:Nd crystals only SCC have been studied as well as their influence on laser operation of GGG:Nd [12].…”

Section: Introductionmentioning

confidence: 99%

Stable and transient color centers in Gd₃Ga₅O₁₂ crystals

Matkovskii

Потера²,

Sugak

et al. 2004

Cryst. Res. Technol.

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The work is devoted to investigation of stable color centers (CC) that are created in Gd 3 Ga 5 O 12 (GGG) crystals under irradiation with γ-quanta (E=1.25 MeV, D= 10 5 Gy ) as well as transient CC created in the crystals under irradiation with pulsed electron beam (E=0.25 MeV, pulse duration 10 ns, fluence 10 12 cm -2 , time interval of registration 0-500 ns). On the basis of the performed study of optical absorption spectra of the as-grown and irradiated crystals it was established the correlation between a defect subsystem of as-grown crystals and a type of CC induced by radiation in the crystals. The role of Ca 2+ dopant ions in the processes of CC formation is examined. Models of the stable and transient CC are proposed.

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Section: Introductionmentioning

confidence: 99%

Stable and transient color centers in Gd₃Ga₅O₁₂ crystals

Matkovskii

Потера²,

Sugak

et al. 2004

Cryst. Res. Technol.

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“…We assume that the color center in YAG is one of the causes of concentration quenching. It has been reported that impurities contribute to the formation of color centers, 29,30) and that hydroxyl impurities also contribute to this process. 31) The sample that was prepared by the sol-gel method in this study has an estimated sintering temperature of ∼700 °C lower than the sample that was produced by the co-precipitation method of Ref.…”

Section: Discussionmentioning

confidence: 99%

Concentration-dependent fluorescence decay and energy transfer in Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic powder

Honda

Motokoshi

Jitsuno

et al. 2021

Jpn. J. Appl. Phys.

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Energy transfer from Cr3+ to Nd3+ in Cr3+ and Nd3+ co-doped Y3Al5O12 (Nd/Cr:YAG) was investigated by measuring the decay curves of Nd3+ and Cr3+ fluorescence for Cr:YAG and Nd/Cr:YAG ceramic powder samples that were produced by the sol–gel method in a Cr3+ concentration range of 0.1–6.0 mol%. The energy transfer processes in Nd/Cr:YAG could be explained based on dipole–dipole interactions even when the concentration quenching of Cr3+ was included, and the experimental fluorescence decay characteristics of Nd3+ excited through Cr3+ were consistent with the theoretical predictions based on dipole–dipole interactions. For a high-quality Nd/Cr:YAG ceramic with negligible concentration quenching, the energy transfer efficiency from Cr3+ to Nd3+ increased with an increase in Cr3+ concentration.

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“…The analyses were focused on transition metals because they are known to participate in the formation of color centers that deteriorate beam quality. 11,12 As shown in Figure 4, transition metal impurities were picked up from each process. The impurity pickup in the extrusion mix can be attributed to the metals used as polymerization catalysts of the binder, and the higher transition metal concentrations of the extruded green fibers appear to be caused by friction from the inner wall of the high pressure syringe.…”

Section: Rheological Behavior Of Yag Extrusion MIXmentioning

confidence: 99%

Processing and transparency of polycrystalline yttrium aluminum garnet (YAG) fibers for optical applications

et al. 2011

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Polycrystalline YAG fibers are of interest for both optical and structural applications. Various processing routes of YAG fibers for structural applications have been explored; however, processing routes for optical quality polycrystalline YAG fiber have not been investigated intensively despite the potential of the material to enable high power lasers. Recent results in the processing of YAG fiber for laser applications are presented and detailed relationship between processes, microstructures, and optical properties of YAG fibers are discussed. Specifically, details of the processes for green fiber preparation, sintering methods, and transparencies depending on the process variables are shown. Our recent advancement in fiber processing prior to sintering has improved the transparency of YAG fiber significantly. Vacuum or air sintering followed by Hot Isostatic Press (HIP) produced fibers with transparency comparable to that of single crystal YAG fiber.

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Relationship between formation of radiation color centers and growth defects in YAG:Nd crystals

Cited by 8 publications

References 4 publications

Stable and transient color centers in Gd₃Ga₅O₁₂ crystals

Stable and transient color centers in Gd₃Ga₅O₁₂ crystals

Concentration-dependent fluorescence decay and energy transfer in Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic powder

Processing and transparency of polycrystalline yttrium aluminum garnet (YAG) fibers for optical applications

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Relationship between formation of radiation color centers and growth defects in YAG:Nd crystals

Cited by 8 publications

References 4 publications

Stable and transient color centers in Gd3Ga5O12 crystals

Stable and transient color centers in Gd3Ga5O12 crystals

Concentration-dependent fluorescence decay and energy transfer in Cr3+ and Nd3+ co-doped Y3Al5O12 ceramic powder

Processing and transparency of polycrystalline yttrium aluminum garnet (YAG) fibers for optical applications

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Stable and transient color centers in Gd₃Ga₅O₁₂ crystals

Stable and transient color centers in Gd₃Ga₅O₁₂ crystals

Concentration-dependent fluorescence decay and energy transfer in Cr³⁺ and Nd³⁺ co-doped Y₃Al₅O₁₂ ceramic powder