An efficient Ho:SrF₂ single-crystal fiber (SCF), lightly Ho-doped to a concentration of 0.5 at.%, was successfully grown using the temperature gradient technique, and its laser characteristics were studied. Several optical parameters of the Ho:SrF₂ SCF were determined using the Judd-Ofelt (J-O) theory, including the J-O intensity parameters, radiative lifetimes, and fluorescence branching ratios. In addition, the continuous-wave (CW), tunable, and passive Q-switched (PQS) laser operations of Ho:SrF₂ SCF pumped by a thulium-doped fiber laser were demonstrated in this study. While the CW laser was operating, average output power greater than 1 W and a continuous tuning range of 62 nm were obtained. For the PQS operation, a minimum pulse duration of 779 ns with a repetition rate of 36.27 kHz was achieved using silver nanorods as saturable absorbers. These results indicate that the Ho:SrF₂ SCF has potential application in tunable or ultrafast laser at 2.1 μm.

使用温度梯度技术成功地生长了一种高效的Ho:SrF ₂单晶光纤（SCF），轻掺杂浓度为0.5  at.%，并研究了其激光特性。_{Ho:SrF 2} SCF的几个光学参数是使用 Judd-Ofelt (JO) 理论确定的，包括 JO 强度参数、辐射寿命和荧光分支比。此外，本研究还展示了由掺铥光纤激光器泵浦的 Ho:SrF _{2 SCF 的连续波 (CW)、可调谐和无源 Q 开关 (PQS) 激光器操作。}CW 激光器工作时，平均输出功率大于 1  W，连续调谐范围为 62 获得纳米。对于 PQS 操作，使用银纳米棒作为可饱和吸收体实现了 779  ns 的最小脉冲持续时间和 36.27 kHz 的重复率。 这些结果表明Ho:SrF ₂ SCF 在2.1 μm 的可调谐或超快激光中具有潜在应用。