| Summary: | Single crystal fiber (SCF) is a novel solid gain medium and technique which combines the advantages of glass fiber and single crystal, showing great potential in the field of high-power lasers. In this paper, Er, Nd: YSGG single crystals with diameters of 2 mm and lengths of 80 mm were successfully grown using the micro-pulling-down method for the first time. Then, the measurements of Laue spots and Er<sup>3+</sup> distribution indicated that the as-grown crystals were of a high quality. The effect of co-doped Nd<sup>3+</sup> on the Er: YSGG was systematically discussed, which demonstrated that Nd<sup>3+</sup> can decrease the fluorescence lifetime of Er: <sup>4</sup>I<sub>13/2</sub> that solve the self-termination bottleneck accordingly. These results demonstrate that Er, Nd: YSGG SCFs are promising materials for the further 3 μm laser generations.
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