报道了一种基于空芯光子晶体光纤中氢气受激拉曼散射的新型1.7 μm光纤激光光源。建立了仅包含泵浦光和一阶斯托克斯光的简单稳态耦合波方程,并进行了仿真计算。采用自制的1550 nm纳秒脉冲光纤放大器,泵浦一段长约3 m、充高压氢气的商用空芯光子晶体光纤,利用氢气分子的转动受激拉曼散射实现了1705 nm斯托克斯波的有效转换。气压为1.2 MPa时,最大平均输出功率约0.5 W(单脉冲能量约为2.5 μJ),最大光光转换效率约为32%(相对总的泵浦功率)。研究结果为实现高功率1.7 μm波段近红外激光输出提供了一条有效的新途径。

A new 1.7 μm fiber laser source based on stimulated Raman scattering of hydrogen in hollow photonic crystal fiber is reported. Simple steady-state coupled wave equations containing only pump light and first-order Stokes light are established and simulated. A homemade 1550 nm nanosecond pulse fiber amplifier is used to pump a commercial hollow photonic crystal fiber about 3 m long and filled with high-pressure hydrogen. The rotational stimulated Raman scattering of hydrogen molecules is used to realize the efficient conversion of Stokes waves at 1705 nm. When the air pressure is 1.2 MPa, the maximum average output power is about 0.5 W (the monopulse energy is about 2.5 μJ), and the maximum optic-to-optic conversion efficiency is about 32% (relative to the total pump power). Research results provide an effective new way to realize the output of high-power 1.7 μm-band near-infrared laser.