提出了一种He气辅助熔接的全光纤型空芯光子晶体光纤(HC-PCF)低压气体腔的制备方法。通过用高压待充气体冲洗HC-PCF,确保了腔内的气体纯度;通过利用光谱监测系统监测HC-PCF降压过程及He气辅助熔接过程中CO2吸收光谱的变化,研究了HC-PCF中气体动力学运动过程;通过利用He气辅助熔接方法,制备得到压强为7 k Pa、插入损耗小于2 d B、长度为10 m的全光纤型HC-PCF低压CO2气体腔。该方法也适用于更低压强的HC-PCF气体腔的研制,且制备的气体腔具有良好的气密性和长期稳定性。 A method for preparing low-pressure gas cavity of all-fiber hollow-core photonic crystal fiber (HC-PCF) with He gas assisting welding is proposed. The gas purity in the chamber was ensured by flushing HC-PCF with a high-pressure gas to be inflated. By monitoring the pressure drop of HC-PCF and the change of CO2 absorption spectrum during He gas assisted splicing by using spectral monitoring system, Gas-based HC-PCF low-pressure CO2 gas chamber with a pressure of 7 kPa, an insertion loss of less than 2 d B, and a length of 10 m was prepared by means of He gas assisted welding. The method is also suitable for the development of a lower pressure HC-PCF gas chamber, and the prepared gas chamber has good gas tightness and long-term stability.