Opt Lett. 2019 Jan 1;44(1):134-137. doi: 10.1364/OL.44.000134.
A 3 at.% Tm-doped CaF crystal was grown successfully and used as a gain medium. A high-efficiency continuous-wave laser and wide tuning performance were demonstrated in this crystal, and passive mode-locking laser operation was realized for the first time, to the best of our knowledge. For continuous-wave operation, the maximum output power was 2.71 W with a high slope efficiency of 70.3%. Using a quartz birefringent filter, a continuous tuning range of approximately 190 nm was observed in the tuning mode. In addition, a passively mode-locked Tm:CaF laser emitting at 1886.8 nm was achieved with a semiconductor saturable absorber mirror. At an absorbed pump power of 2.65 W, a pulse duration with tens of picoseconds was obtained at a pulse repetition rate of 96.35 MHz.
成功生长了 3at.%Tm 掺杂 CaF 晶体并将其用作增益介质。在该晶体中，我们演示了高效率的连续波激光和宽调谐性能，据我们所知，这是首次实现了被动锁模激光运转。对于连续波运转，最大输出功率为 2.71W，斜率效率高达 70.3%。使用石英双折射滤波器，在调谐模式下观察到大约 190nm 的连续调谐范围。此外，利用半导体可饱和吸收镜实现了 1886.8nm 的被动锁模 Tm:CaF 激光。在吸收泵浦功率为 2.65W 的情况下，在 96.35MHz 的脉冲重复率下获得了几十皮秒的脉冲持续时间。
