Optical absorption in cobalt-containing epitaxial films of gadolinium gallium garnet

Randoshkin, V. V.; Vasil’eva, N. V.; Плотниченко, В. Г.; Pyrkov, Yu. N.

doi:10.1134/1.1337250

Cited by 2 publications

(3 citation statements)

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“…Because the experiments on diffusion doping of GGG by heating of the crystal in the presence of cobalt oxide powder were not carried out earlier, the obtained data can be compared only with the ones obtained for crystalline materials (both bulk ones and films) doped during their growth [7][8][9][10][11][20][21][22][23][24][25][26]. In accordance with these data the band in the region of 900-1600 nm should be related to the absorption of tetrahedrally coordinated Co 2+ ions ( 4 A 2 → 4 T 1 transition).…”

Section: Resultsmentioning

confidence: 99%

“…One of the most frequently used Co 2+ -doped laser materials are garnet crystals, firstly yttrium aluminum (Y 3 Al 5 O 12 , YAG) and gadolinium gallium (Gd 3 Ga 5 O 12 , GGG) ones [1,4,[7][8][9][10]. In particular, both bulk GGG crystals grown by the Czochralski technique [7] and the crystalline GGG:Co 2+ films [8][9][10] grown by the liquid phase epitaxy on GGG substrates are used for Qswitching.…”

Section: Introductionmentioning

confidence: 99%

“…Increase of Co 2+ (d) ions concentration is ensured by co-doping of the GGG by four-valent ions, e.g. Si 4+ or Ge 4+ [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Co Ions Diffusion in Gd₃Ga₅O₁₂ Single Crystals

et al. 2018

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Spatial changes of properties of Gd3Ga5O12 (GGG) single crystals caused by diffusion of cobalt ions during high-temperature annealing (1200 • C, 24 h) in Co3O4 powder are investigated. The registration of these changes was carried out by optical spectrophotometry, microscopy and micro-Raman scattering methods. Changes in structure of near-surface layers of the crystal were investigated by X-ray diffraction technique. It was shown that the additional absorption induced by annealing is related to intra-center optical transitions in Co 2+ ions, which occupy tetrahedral positions in the garnet structure at the distances of 250-500 µm from the crystal surface. The dependence of induced absorption with depth has got a non-monotonous character with a maximum at 400 µm. A comparison of the results obtained by different methods allows to suppose that the thermal treatment of GGG in the presence of cobalt ions leads to formation of the structurally and chemically non-uniform layer with a width about 500 µm.

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