Opt Lett. 2018 May 15;43(10):2418-2421. doi: 10.1364/OL.43.002418.
An Er-doped CaF-SrF mixed crystal was grown using the temperature gradient technique, and its laser characteristics were studied. In a compact linear cavity, a continuous-wave output power of 712 mW was obtained with the highest slope efficiency of 41.4%. Using a semiconductor saturable absorber mirror, a passive Q-switched mode-locked Er:CaF-SrF laser emitting at 2729.5 nm was demonstrated for the first time, to the best of our knowledge. The maximum average output power of 125 mW was obtained at an absorbed pump power of 1.81 W, and the repetition rate of the Q-switched envelope was 4.17 kHz. The mode-locked pulses in the Q-switched pulse envelope had a repetition rate of 136.3 MHz, and its duration was estimated to be approximately 1.78 ns. These results indicate that the Er-doped CaF-SrF mixed crystal is promising for the development of an ultrafast laser in the mid-infrared regime.
采用温度梯度法生长掺铒氟化钙-氟化锶混合晶体，并研究了其激光特性。在紧凑型线性腔中，获得了 712mW 的连续波输出功率，最高斜率效率为 41.4%。首次利用半导体可饱和吸收镜，演示了工作波长为 2729.5nm 的被动调 Q 锁模掺铒氟化钙-氟化锶激光器。在吸收泵浦功率为 1.81W 时，获得了最大平均输出功率 125mW，调 Q 脉冲包络的重复频率为 4.17kHz。调 Q 脉冲包络中的锁模脉冲重复率为 136.3MHz，其持续时间约为 1.78ns。这些结果表明，掺铒氟化钙-氟化锶混合晶体有望在中红外超快激光领域得到发展。
