The Czochralski growth and characterization of SrLaGa_3O_7: Ho~(3+) single crystals

摘要

Rare - earth (Nd, Pr, Dy) doped SrLaGa_3O_7 single crystals are promising laser materials. Also crystals doped with Ho~(3+) ions could be used as efficient laser in visible and near infrared regions. Laser materials, generating in visible and infrared regions, can be used for optical data recording in microphotolitography and in medicine. SrLaGa_3O_7 single crystals doped with 0.3, 1.5 and 2 at % of Ho~(3+), respectively were grown by the Czochralski method with use of iridium crucible and afterheater. According to EPMA measurements distribution coefficient of Ho~(3+) in SrLaGa_3O_7 was estimated to be k approx= 0.22. Optical absorption spectra in visible and infrared regions were measured at 300 K and 12 K, respectively. Optical quality of single crystals was checked by the use of computerized imaging spectropolarimeter and polariscopic measurements. Temperature dependence of capacitance and conductivity for different dopant concentrations were also measured.