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In this work we studied spectroscopic characteristics of potassium-lead double-chloride, and lithium-yttrium double-fluoride crystals doped with dysprosium. Objects of research were KPb2Cl5:Dy3+, and LiYF4(YLF):Dy3+ crystals grown by the Bridgman-Stockbarger technique. We obtained the effective distribution coefficients K-Dy = 0.95 for LiYF4:Dy3+, and K-Dy = 1 for KPb2Cl5:Dy3+. Optical spectra were studied, intensity parameters were determined by the Judd-Ofelt method, and radiative probabilities and branching ratio were calculated. The conclusion was made that the studied crystals can be considered as promising new active media for laser diode pumped solid state lasers. The YLF:Dy3+ crystals are perspective for laser action near 3 mm, and the KPb2Cl5:Dy3+ for multiwavelength IR lasers, and for 1.3 mm laser diode pumped telecommunication amplifiers.

acta physica polonica. a

Comparative Spectroscopic Study of the Dy<sup>3+</sup>Doped Double Chloride and Double Fluoride Crystals for Telecommunication Amplifiers and IR Lasers

Comparative Spectroscopic Study of the Dy3+Doped Double Chloride and Double Fluoride Crystals for Telecommunication Amplifiers and IR Lasers

Comparative Spectroscopic Study of the Dy³⁺Doped Double Chloride and Double Fluoride Crystals for Telecommunication Amplifiers and IR Lasers