Effect of Electron Irradiation on the Optical Properties of Gadolinium-Aluminum-Gallium Garnet CrystalsстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 12 января 2022 г.
Аннотация:The effect of electron irradiation on the properties of crystals of gadolinium-aluminum-gallium garnets Gd3Al2Ga3O12 (Al : Ga = 2 : 3), Gd3Al3Ga2O12 (Al : Ga = 3 : 2) and crystals doped with cerium Gd3Al2Ga3O12:Ce (Al : Ga = 2 : 3) (GAGG:Ce) is studied. The irradiation of cerium-doped crystals with electron doses from 300 to 2500 Mrad does not affect the optical properties of the crystals, which indicates their resistance to the formation of defects under high-energy irradiation. The optical transmission spectra of undoped Gd3Al2Ga3O12 and Gd3Al3Ga2O12 crystals noticeably decreases after irradiation with electron doses of 300 and 400 Mrad and these initially colorless crystals become brownish. A broad absorption band appears in the wavelength range of 350–500 nm, which is associated with the formation of structural defects such as color centers. The refractive indices of the crystals Gd3Al2Ga3O12 and GAGG:Ce barely change, but Gd3Al3Ga2O12 shows an increase in n(λ) depending on the exposure to high-energy radiation. The characteristic absorption bands of unirradiated GAGG:Ce with maxima at 340 and 440 nm are likely associated with the formation of crystal-lattice defects, and not only with electronic transitions of Ce.