He气辅助熔接的全光纤型HC-PCF低压气体腔的制备

Preparation of All-Fiber HC-PCF Low-Pressure Gas Cell by the He-Assisted Fusion Splicing Technique

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 of He-assisted fusion splicing is demonstrated to prepare the all-fiber hollow-core photonic crystal fiber （HC-PCF） low-pressure gas cell. In the preparing process, the high gas purity is guaranteed by flushing the HC-PCF with the high-pressure desired gas; the dynamical gas flow in the HC-PCF is studied with a self-made real-time spectral detection system; and a 10 m all-fiber HC-PCF low-pressure CO2 gas cell with the pressure of 70 kPa and insertion loss less than 2 dB is successfully prepared by He-assisted fusion splicing technique. This method may also be suitable for the fabrication of HC-PCF gas cell with lower pressure, and the prepared gas cell shows good air-tightness and long-term stability.