Study of structural and optical properties of YAG and Nd:YAG single crystals

Kostić, S.; Lazarević, Zorica Ž.; Radojević, Vesna; Milutinović, A.; Romčević, M.; Romčević, N.; Valcic, Andreja

doi:10.1016/j.materresbull.2014.11.033

Cited by 100 publications

(36 citation statements)

References 31 publications

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“…The most typical point defects in garnet crystals are extrinsic substitutional point defects, intrinsic antisite defects, and vacancies (see, e.g., Refs. ). Particularly, the creation of antisite defects in GGG crystals grown by Czochralski method from the melt‐solution (3Gd 2 O 3 + 5Ga 2 O 3 ) occurs due to the gallium evaporation, which causes the change of stoichiometric ratio 3:5 toward the increase of gadolinium cations Gd 3+ .…”

Section: Defects and Strains In Imperfect Garnetsmentioning

confidence: 97%

Dynamical X‐ray diffraction theory: Characterization of defects and strains in as‐grown and ion‐implanted garnet structures

Olikhovskii

Molodkin

Skakunova

et al. 2017

Physica Status Solidi (b)

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The generalized dynamical theory of X-ray diffraction by imperfect single crystals is extended to characterize structure imperfections of real single crystals with complex basis and similar crystalline films with inhomogeneous strain fields. The influence of various defects (intrinsic and extrinsic point defects, nanoclusters, and microdefects), simultaneously presented in such structures, on changing both average and fluctuating strain fields as well as structure factors are taken into account. The analytical expressions connecting immediately the coherent and diffuse components of the scattering intensity with statistical characteristics of these defects are obtained. Thus, the self-consistent description of the coherent and diffuse dynamical diffraction intensity components is provided. Some examples of the application of the developed theoretical model to treat rocking curves measured from various garnet structures by using high-resolution double-crystal X-ray diffractometer are reviewed. Possibilities for the quantitative characterization of structural defects and strain profiles in the as-grown and ion-implanted garnet single crystals and yttrium iron garnet films are demonstrated.The self-consistent dynamical description of coherent and diffuse scattering intensities from imperfect crystal structures with inhomogeneous strain fields and randomly distributed defects make it possible to determine the parameters of strain profiles and statistical characteristics of defects by analytical treating the coherent and diffuse components of rocking curves measured by the high-resolution double-crystal X-ray diffractometer with widely open detector window.

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Section: Defects and Strains In Imperfect Garnetsmentioning

confidence: 97%

Dynamical X‐ray diffraction theory: Characterization of defects and strains in as‐grown and ion‐implanted garnet structures

Olikhovskii

Molodkin

Skakunova

et al. 2017

Physica Status Solidi (b)

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“…For YAG, the low frequency peaks at ~ 161 and 217 cm −1 can be assigned as the translational modes of YO 8 unit, and those ranging from 240 to 420 cm −1 can be ascribed to mixing of the translational and rotational modes of YO 8 frequency region of 500-900 cm −1 correspond to the υ 1 breathing, υ 2 quadruple and υ 4 molecular internal modes of AlO 4 . 38,39 In contrast, much fewer Raman modes were identified in the spectrum of Li 6 CaLa 2 Nb 2 O 12 , which was attributed by Papagelis et al to the weakness or degeneracy of some modes, 40 and the four main groups of bands in the ranges of ~ 80-175, 175-320, 320-600 and 600-900 cm −1 , respectively, are similar to the characteristic Raman bands observed for Al-doped Li 7 La 3 Zr 2 O 12 garnet (Ia-3d space group). 41 This verified the structure model of Li 6 CaLa 2 Nb 2 O 12 in this work.…”

Section: Characterizationsmentioning

confidence: 99%

Phase evolution, structure, and up‐/down‐conversion luminescence of Li₆CaLa₂Nb₂O₁₂:Yb³⁺/RE³⁺ phosphors (RE = Ho, Er, Tm)

Zhu

et al. 2020

J Am Ceram Soc

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Garnet‐type Li6Ca(La0.97Yb0.02RE0.01)2Nb2O12 (RE = Ho, Er, Tm) new phosphors were successfully synthesized via solid reaction at 900°C for 5 hours, whose course of phase evolution, macroscopic/local crystal structure and up‐/down‐conversion (UC/DC) photoluminescence were clarified. Mechanistic study and materials characterization were attained via XRD, Rietveld refinement, DTA/TG, electron microscopy (FE‐SEM/TEM), and Raman/reflectance/fluorescence spectroscopies. The phosphors were shown to exhibit UC luminescence dominated by a ~ 553 nm green band (5F4/5S2 → 5I8 transition) for Ho3+, a ~ 568 nm green band (4S3/2 → 4I15/2 transition) for Er3+ and a ~ 806 nm near‐infrared band (3H4 → 3H6 transition) for Tm3+ under 978 nm laser excitation, with CIE chromaticity coordinates of around (0.31, 0.68), (0.38, 0.60) and (0.17, 0.24), respectively. Analysis of the pump‐power dependence of UC intensity indicated that all the emissions involve a two‐photon mechanism except for the ~ 486 nm blue emission of Tm3+ (1G4 → 3H6), which requires a three‐photon process. The DC luminescence of these phosphors is featured by dominant bands at ~ 553 nm for Ho3+ (green, 5F4/5S2 → 5I8 transition), ~568 nm for Er3+ (green, 4S3/2 → 4I15/2 transition) and ~ 464 nm for Tm3+ (blue, 1D2 → 3F4 transition). The UC and DC properties were also comparatively discussed.

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“…It is well-known that the YAG crystals applied to high-power laser programs such as HiPER and LUCIA must guarantee large-size and high quality gain medium of its own kind with a good thermal conductivity [2,3]. Unfortunately, the limit of the conventional Czochralski (CZ) technique [4] to fabricate the desired Nd-doped YAG single crystals is that it introduces the defects which would affect the laser performance, such as cores or light-scattering particles, inhomogeneous distribution of laseractive dopant and contamination of boule [5].…”

Section: Introductionmentioning

confidence: 99%

Direct thermal diffusion bonding of Nd:YAG/YAG composite transparent ceramics by vacuum sintering

Zhang

Chen

et al. 2017

Journal of the European Ceramic Society

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Study of structural and optical properties of YAG and Nd:YAG single crystals

Cited by 100 publications

References 31 publications

Dynamical X‐ray diffraction theory: Characterization of defects and strains in as‐grown and ion‐implanted garnet structures

Dynamical X‐ray diffraction theory: Characterization of defects and strains in as‐grown and ion‐implanted garnet structures

Phase evolution, structure, and up‐/down‐conversion luminescence of Li₆CaLa₂Nb₂O₁₂:Yb³⁺/RE³⁺ phosphors (RE = Ho, Er, Tm)

Direct thermal diffusion bonding of Nd:YAG/YAG composite transparent ceramics by vacuum sintering

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Study of structural and optical properties of YAG and Nd:YAG single crystals

Cited by 100 publications

References 31 publications

Dynamical X‐ray diffraction theory: Characterization of defects and strains in as‐grown and ion‐implanted garnet structures

Dynamical X‐ray diffraction theory: Characterization of defects and strains in as‐grown and ion‐implanted garnet structures

Phase evolution, structure, and up‐/down‐conversion luminescence of Li6CaLa2Nb2O12:Yb3+/RE3+ phosphors (RE = Ho, Er, Tm)

Direct thermal diffusion bonding of Nd:YAG/YAG composite transparent ceramics by vacuum sintering

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Phase evolution, structure, and up‐/down‐conversion luminescence of Li₆CaLa₂Nb₂O₁₂:Yb³⁺/RE³⁺ phosphors (RE = Ho, Er, Tm)