We present what is, to the best of our knowledge, the first pure-three-level $\mathrm{Yb}\text{:}{\mathrm{Ca}}_4\mathrm{GdO}{({\mathrm{BO}}_3)}_3$ (Yb:GdCOB) laser emitting at 976 nm based on the ${}^2{\mathrm{F}}_{5/2}-{{}^2\mathrm{F}}_{7/2}$ transition, generally used for a quasi-three-level emission at 1032 nm. A maximum power of 782 mW at 976 nm has been achieved in continuous-wave (CW) operation pumped by a quasi-three-level $\mathrm{Nd}\text{:}{\mathrm{SrLaAlO}}_4$ laser emitting at 902 nm. Moreover, a self-frequency-doubling CW blue laser has also been demonstrated with a maximum power of 133 mW at 488 nm.

中文翻译：

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976 nm的纯三能级Yb：GdCOB连续波激光器

据我们所知，我们提出的是第一个纯三级 $b\text{：}{钙}_{4}d{（{\mathrm{BO}}_3）}_3$ （Yb：GdCOB）激光基于976 nm发射 ${}^{\mathrm{2个}}{\mathrm{F}}_{5/\mathrm{2个}}-{{}^{\mathrm{2个}}\mathrm{F}}_{7/\mathrm{2个}}$跃迁，通常用于1032 nm的准三能级发射。在准三能级泵浦的连续波（CW）操作中，在976 nm处实现了782 mW的最大功率$钕\text{：}{\mathrm{斯拉罗}}_4$发射波长为902 nm的激光。此外，还已经展示了一种自倍频连续波蓝色激光器，其在488 nm处的最大功率为133 mW。