Full concentration range of Lu 2x Gd 2-2x SiO 5 (LGSO:Ce) crystals was grown by the Czochralski method. Dependence of scintillation properties on composition (х) in the range of solid solutions is established. It was determined that LGSO:Ce scintillation yield increases in the range 0.3<х< 0.8 and reaches 29000 phot/MeV at 60% of Lu in the host (x=0.6), and energy resolution improves up to 6.7 % at 662 KeV. The observed light yield increase, surprisingly high Ce

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A significant enhancement in the light attenuation length in 22–55 cm long YAG:Ce and YAG:Ce,Mg fibers grown by the micro-pulling-down method has been reported.

The influence of the reducing Ar+CO atmosphere on the stages of starting raw material preparation, growth and post-growth annealing of yttrium aluminium garnet, Y3Al5O12 (YAG) crystals was studied. The chemical reactions involving CO atmosphere and its impact on the raw material, melt, and crystal composition are determined. Modification of YAG optical properties under the reducing annealing is discussed.

Undoped and Ce-doped Lu3Al5O12 (LuAG) and Y3Al5O12 (YAG) single crystal fibers were grown by the micro-pulling down technique (µ-PD) with a purpose to fit the design of new dual-redaout calorimeter planned to operate in future experiences of high energy physics.Fibers up to 20 cm in length and 1mm in diameter were grown along [111] direction. Based on the measurements of the attenuation length along the fibers, the growth conditions to improve the fibers quality were selected. Our results showed that the grown fibers have the capability to be used for future detectors.