Abstract
We investigated the thermal properties and Stark-level energies of Er3+:Lu2SiO5 crystal and its in-band laser-pumped CW laser. The thermal conductivity, which was calculated by the thermal diffusion coefficient and the specific heat, decreased from 5.3 to 3.2 Wm−1 k−1 with the temperature increasing from 298.15 to 573.15 K. From the low temperature absorption spectra at 10 K and photoluminescence spectrum at 12 K, the Stark level energies of Er3+ were obtained for the ground state and many excited states. Under pumping by a 1536 nm laser with 4.4 W power, a 1596 nm CW laser with maximum output power of 610 mW was obtained, corresponding to a slope efficiency and optical efficiency of 16.3 % and 13.9 %, respectively.
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