Self-Q-switched lasing was demonstrated for the first time around 2-µm in Thulium (Tm) doped CaF2 single-crystal fiber (SCF) using a compact linear cavity. Maximum average output power of 1.17 W was obtained under 2.38 W absorbed pump power, corresponding to the slope efficiency of up to 56.01%. Self-Q-switched laser with a 1.736 µs shortest pulse width at 48.80 kHz repetition rate was successfully realized. Besides, broad wavelength-tunable Tm:CaF2 SCF laser in 1859-2040 nm region was operated. These results show that the Tm:CaF2 SCF is a promising alternative for generating efficient micro diode-pumped pulsed lasers at 2-µm.

中文翻译：

---

Tm3+掺杂CaF2单晶光纤中的自调Q和宽波长可调激光

使用紧凑的线性腔在掺铥 (Tm) 的 CaF2 单​​晶光纤 (SCF) 中首次展示了大约 2 µm 的自 Q 开关激光。在 2.38 W 吸收泵浦功率下获得 1.17 W 的最大平均输出功率，对应的斜率效率高达 56.01%。成功实现了在 48.80 kHz 重复频率下具有 1.736 µs 最短脉冲宽度的自调 Q 激光器。此外，还操作了 1859-2040 nm 范围内的宽波长可调 Tm:CaF2 SCF 激光器。这些结果表明，Tm:CaF2 SCF 是一种很有前景的替代方案，可用于产生 2 µm 的高效微型二极管泵浦脉冲激光器。