The Er³⁺-doped Gd₃Sc₂Ga₃O₁₂ (Er³⁺:GSGG) single crystal, a excellent medium of the mid-infrared and anti-radiation solid state laser pumped by laser diode, was grown by Czochralski method successfully. The absorption spectra was measured and analyzed in a wider spectral wavelength range of 350-1700 nm with different temperature points from low to room temperature (7.6 K, 77 K, 200 K and 300 K). The free-ions and crystal-field parameters were fitted to the experimental energy levels with the root mean square deviation of 8.69 cm^-1. According to the crystal-field calculations, 52 Stark energy levels of Er³⁺ in GSGG host crystals were assigned. The fitting results of free-ions and crystal-field parameters were compared with those already reported of Er³⁺:YSGG. The results indicated that the free-ions parameters are similar to those of the Er³⁺ in GSGG and YSGG crystals, and the crystal-field interaction of GSGG is weaker than that of YSGG, which may result in the better laser characterization of Er³⁺:GSGG crystal.

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