Wei Zhenshuai, Luan Jizhe, Huang Lu, Zhao Wei, Zhao Xian, Zhao Zhigang, Cong Zhenhua, Liu Zhaojun
Opt Lett. 2023 Oct 1;48(19):5109-5112. doi: 10.1364/OL.502110.
A 1940 nm single-frequency distributed Bragg reflector (DBR) fiber laser was demonstrated based on a Tm : YAG/Ho : YAG-co-derived silica fiber (THCDSF). The THCDSF, which had a core dopant concentration of 8.02 wt.% TmO and 1.18 wt.% HoO, was prepared via the melt-in-tube (MIT) method using a Tm : YAG and a Ho : YAG as the precursor core and a silica tube as the cladding. Employing 1.8 cm of the THCDSF, we achieved a maximum single-frequency output power of 315 mW at 1940 nm when pumped by a 1610 nm fiber laser. The slope efficiency of the laser was 29.68% for the absorbed pump power. The laser linewidth was less than 23.65 kHz, and the relative intensity noise (RIN) stabilized at -145 dB/Hz after exceeding 4.8 MHz. To the best of our knowledge, this is the first demonstration of a single-frequency DBR laser with a Tm/Ho fiber as the gain medium.
基于Tm : YAG/Ho : YAG共掺杂石英光纤（THCDSF）演示了一种1940 nm单频分布布拉格反射镜（DBR）光纤激光器。通过采用Tm : YAG和Ho : YAG作为前驱体纤芯、石英管作为包层的管内熔融（MIT）法制备了纤芯掺杂浓度为8.02 wt.% TmO和1.18 wt.% HoO的THCDSF。使用1.8 cm的THCDSF，当由1610 nm光纤激光器泵浦时，在1940 nm处实现了315 mW的最大单频输出功率。该激光器对于吸收的泵浦功率的斜率效率为29.68%。激光线宽小于23.65 kHz，相对强度噪声（RIN）在超过4.8 MHz后稳定在-145 dB/Hz。据我们所知，这是首次演示以Tm/Ho光纤作为增益介质的单频DBR激光器。
