Abstract
The absorption, photoluminescence, and x-ray luminescence spectra of pure and neodymium-activated YAG crystals grown by the horizontal directional crystallization method were investigated at 295°K in the wavelength range 190–900 nm. A particular study was made of wide strong absorption bands with maxima at 224 and 205 nm due to introduction of neodymium into YAG crystals. These bands were attributed to the 4f →5d transitions in Nd3+ ions localized at normal and anomalous structural positions. A system of luminescence bands observed in the 260–620 nm range excited by x-ray and hard (e >4.79 eV) photoexcitation of YAG:Nd was attributed to transitions from the 2F 25/2 (e =37 850 cm−1) level to levels of all the lower neodymium multiplets. In the case of excitation by softer photons (3.22 ≲ e ≲ 4.68 eV), the luminescence spectrum was due to transitions from another metastable level 2P3/2 (e =25 990 cm−1) to levels of lower terms. A new structural scheme was proposed for the formation of anomalous rare-earth ion centers in laser garnets.
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