反共振空芯光子晶体光纤(HC-PCF)在中红外光纤气体激光器中具有重要的应用价值,其与实芯光纤的低损耗耦合是实现全光纤结构光纤气体激光器的关键技术。采用将实芯光纤拉锥后插入空芯光纤的方案开展研究。理论和实验结果表明,利用光纤拉锥处理技术改变普通光纤模场直径,可使拉锥光纤与空芯光纤的模场直径近似匹配,从而实现实芯光纤与大模场直径反共振HC-PCF的低损耗耦合。对于模场直径约为35μm的Ice-cream型反共振HC-PCF,仿真结果表明,当锥腰直径为30~50μm时,耦合效率高于95%,最高可达98%,实验测得锥腰直径为35μm时的耦合效率为96.05%。该结论为大模场直径空芯光纤与实芯光纤的低损耗耦合和实现全光纤结构气体激光器的全光纤化提供了一条可行的技术途径。 The anti-resonant hollow core photonic crystal fiber (HC-PCF) has important application value in the mid-infrared fiber gas laser. The low-loss coupling with the solid core fiber is the key technology to realize the all-fiber structured fiber gas laser. Employing solid core fiber taper into the hollow fiber core program to carry out research. The theoretical and experimental results show that using the fiber taper processing technology to change the mode field diameter of an ordinary fiber, the mode field diameter of the taper fiber and the hollow core fiber can be approximately matched, so that the solid core fiber and the large mode field diameter anti-resonance HC-PCF Low loss coupling. For ice-cream anti-resonance HC-PCF with a mode field diameter of about 35μm, the simulation results show that the coupling efficiency is higher than 95% and the maximum is 98% when the diameter of the cone is 30 ~ 50μm. The coupling efficiency at a diameter of 35 μm was 96.05%. This conclusion provides a feasible technical approach for the low-loss coupling of large-mode-diameter hollow fiber and solid-core fiber and the realization of full-fiber all-fiber structured gas laser.