We report here an efficient watt-level tunable 1.7 µm fiber gas Raman laser. Pumped by a homemade pulsed fiber amplifier around 1.5 µm wavelength, a tunable laser ranging from 1687 to 1723 nm is demonstrated in a hydrogen-filled hollow-core photonic crystal fiber (HC-PCF). A maximum average power of $\sim{0.8}\;{\rm W}$ (pulse energy of $\sim{1.6}\;\unicode{x00B5} {\rm J}$) is achieved on a 20-m-long HC-PCF filled with 16 bar of hydrogen gas, corresponding to a maximum Raman power conversion efficiency of 60%. A steady-state model of the rotational stimulated Raman scattering in hydrogen-filled HC-PCF, considering the pump pulse shape, is also established. The predicted output power and pulse shapes of the pump and Stokes waves are in good agreement with the experimental results. Our system offers an elegant solution for realizing efficient, tunable, and high-power fiber lasers operating at 1.7 µm wavelength range.

中文翻译：

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高效，瓦特级，可调谐的1.7 µm光纤拉曼激光器，用于填充H _2的空心光纤

我们在这里报告了一种有效的瓦特级可调谐1.7 µm光纤气体拉曼激光器。在波长为1.5 µm的自制脉冲光纤放大器中泵浦，在充氢的空心光子晶体光纤（HC-PCF）中演示了1687至1723 nm范围内的可调激光器。最大平均功率$ \ sim {0.8} \; {\ rm W} $（脉冲能量为$ \ sim {1.6} \; \ unicode {x00B5} {\ rm J} $）可以在20米长的HC-PCF中充满16 bar的氢气，这相当于60％的最大拉曼功率转换效率。考虑泵浦脉冲的形状，建立了充氢HC-PCF中旋转受激拉曼散射的稳态模型。泵浦和斯托克斯波的预测输出功率和脉冲形状与实验结果非常吻合。我们的系统提供了一种优雅的解决方案，可实现在1.7 µm波长范围内工作的高效，可调和高功率光纤激光器。