Li Zhuang, Dai Rongbin, Liao Wenlu, Xu Huiying, Cai Zhiping
Opt Lett. 2024 Sep 1;49(17):4815-4818. doi: 10.1364/OL.532800.
We report an all-solid-state near-infrared single-frequency (single longitudinal mode, SLM) Pr:LiYF4 (Pr:YLF) laser with the spectral linewidth at the sub-picometer level. The SLM lasers with center wavelengths of 868 and 907 nm are realized in Pr:YLF crystal for the first time to the best of our knowledge. The maximum output powers of SLM lasers at 868 and 907 nm are 102 and 213mW, corresponding to the narrowest spectral linewidths of 82 MHz (0.21 pm) and 94 MHz (0.26 pm), respectively. At the maximum output power, the beam quality factors in the x and y directions are measured as 1.25 and 1.16 at 868 nm and 1.21 and 1.13 at 907 nm, respectively. The output power stabilities of the 868 and 907 nm SLM lasers are calculated as 1.39% and 0.87%, respectively. The successful realization of 868 and 907 nm all-solid-state SLM lasers makes up for the gap that the Pr:YLF SLM lasers developed in the past are focused on the visible region, enriches the types of near-infrared (NIR) SLM lasers, and can provide practical applications in biomedicine, cold atom physics, and optical atom manipulation.
我们报道了一种全固态近红外单频（单纵模，SLM）Pr:LiYF4（Pr:YLF）激光器，其谱线宽度处于亚皮米级别。据我们所知，首次在Pr:YLF晶体中实现了中心波长为868和907 nm的单纵模激光器。868和907 nm单纵模激光器的最大输出功率分别为102和213 mW，对应的最窄谱线宽度分别为82 MHz（0.21 pm）和94 MHz（0.26 pm）。在最大输出功率下，868 nm处x和y方向的光束质量因子分别测得为1.25和1.16，907 nm处分别为1.21和1.13。868和907 nm单纵模激光器的输出功率稳定性分别计算为1.39%和0.87%。868和907 nm全固态单纵模激光器的成功实现弥补了过去开发的Pr:YLF单纵模激光器集中在可见光区域的空白，丰富了近红外（NIR）单纵模激光器的类型，并可在生物医学、冷原子物理和光学原子操纵等领域提供实际应用。
