Abstract
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 were measured and analyzed in a wider spectral wavelength range of 350–1700 nm at different temperatures of 7.6, 77, 200 and 300 K. The free-ions and crystal-field parameters were fitted to the experimental energy levels with the root mean square deviation of 9.86 cm−1. According to the crystal-field calculations, 124 degenerate 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 for Er3+ in GSGG host are similar to those in YSGG host 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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