Abstract
1at% Er3+ doped Er: GdTaO4 laser crystal with high optical quality was successfully grown by the Czochralski method. The structural parameters were obtained by the X-ray Rietveld refinement. A high crystalline quality of Er: GdTaO4 was determined by the X-ray rocking curve. The transition intensity parameters of Er3+ ions were fitted according to the absorption spectra along three principal polarization directions. The relatively larger emission cross section (1.022×10−20cm2), long fluorescence lifetime ( 5.66ms) and relatively weaker reabsorption phenomenon around 1.6µm indicate that 1at% Er: GdTaO4 crystal can be used as a promising NIR laser material. Meanwhile, the stimulated emission cross-section spectra along three principal polarization directions were investigated for 4I13/2 →4I15/2 transitions at 1.5–1.6µm which indicates a great potential of Er: GdTaO4 for multi-wavelength emission at 1.5–1.6µm. In addition, the possibility of generating green and red lasers in Er: GdTaO4 was also analyzed and evaluated.
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