Li Hao, Huang Wei, Pei Wenxi, Zhou Zhiyue, Cui Yulong, Wang Meng, Wang Zefeng
Opt Lett. 2021 Oct 15;46(20):5208-5211. doi: 10.1364/OL.426206.
Here, we report the first, to the best of our knowledge, all-fiber gas Raman laser oscillator (AFGRLO), which is formed by fusion splicing solid-core fibers and a hydrogen-filled hollow-core photonic crystal fiber, and further introducing fiber Bragg gratings at a Stokes wavelength. Pumping with a homemade 1.54 µm fiber amplifier seeded by a narrow linewidth diode laser, we obtain the maximum output Stokes power of 1.8 W at 1693 nm by rotational stimulated Raman scattering of hydrogen molecules. Due to the involvement of the resonant cavity, the measured Raman threshold is as low as 0.98 W, which has been reduced nearly 20 times, compared with that of the single-pass structure. Moreover, a numerical model of an AFGRLO is established for the first time, to the best of our knowledge, and the simulations agree well with the experimental results. This Letter is significant for the development of fiber gas Raman lasers (FGRLs), particularly for achieving compact CW FGRLs towards the mid-infrared.
据我们所知，在此我们报道了首个全光纤气体拉曼激光振荡器（AFGRLO），它由实心光纤与充氢空心光子晶体光纤熔接而成，并在斯托克斯波长处进一步引入光纤布拉格光栅。利用由窄线宽二极管激光器泵浦的自制1.54 µm光纤放大器，通过氢分子的旋转受激拉曼散射，我们在1693 nm处获得了1.8 W的最大输出斯托克斯功率。由于谐振腔的作用，测得的拉曼阈值低至0.98 W，与单通结构相比降低了近20倍。此外，据我们所知，首次建立了AFGRLO的数值模型，模拟结果与实验结果吻合良好。这封信对于光纤气体拉曼激光器（FGRL）的发展具有重要意义，特别是对于实现紧凑型连续波FGRL向中红外波段发展。
