报道了半导体抽运的单程中红外光纤气体激光器。用一个被调制放大的可调谐1.5 μm半导体激光器抽运一段长为2.3 m、充低压乙炔气体的低损耗负曲率空心光子晶体光纤(HC-PCF)，实现了单程有效的中红外（3.1~3.2 μm）激光输出，气压为200 Pa时光光转换效率大于14.5%，100 Pa时激光阈值小于100 nJ。为实现高效紧凑的大功率中红外光纤激光器提供了一条可能的技术途径。

A diode-pumped single-path mid-IR fiber gas laser is reported. 3.1~3.2 μm laser emission is generated in a 2.3 m low-loss negative curvature hollow core photonic crystal fiber (HC-PCF) filled with low pressure acetylene, pumped by a modulated, amplified, tunable 1.5 μm diode laser. The maximum energy conversion efficiency is higher than 14.5% at 200 Pa, and the minimum laser threshold is lower than 100 nJ at 100 Pa. This research potentially provides an effective rout to obtain compact, high-power mid-IR fiber gas laser.