光纤型空芯光子晶体光纤低压CO_2气体腔的制备

Preparation of All-Fiber Low-Pressure CO_2 Gas Cell Based on Hollow-Core Photonic Crystal Fiber

报道了一种低损耗小型化高纯度高稳定性的光纤型空芯光子晶体光纤(HC-PCF)低压CO2气体腔。通过采用高压待充气体对HC-PCF进行气体置换、利用高压填充的HC-PCF进行尾纤耦合,确保了腔内填充气体的纯度;通过熔接单模光纤(SMF)作为输入端、经陶瓷插芯套管准直对接多模光纤(MMF)作为输出端,有效降低了插入损耗;通过对HC-PCF的实时监控降压与胶封,制备出压强低至10kPa的光纤型HC-PCF低压CO2气体腔。该HC-PCF低压腔的插入损耗约为3.5dB,且具有长期气密性与稳定性。这种HC-PCF低压气体腔在光纤气体传感、激光稳频、高分辨光谱等方面具有广泛应用前景。

A low-loss, compact, miniaturized and stable low-pressure C02 cell is proposed based on hollow-core photonic crystal fiber （HC-PCF）. In order to ensure the gas purity, the HC-PCF is firstly flushed with high-pressure high-purity CO2, and then connected with conventional optical fibers under the high-pressure environment. The insertion loss of HC-PCF gas cell is reduced efficiently by splicing one end of the HC-PCF to single-mode fiber （SMF） and connecting the other end of HC-PCF to multi-mode fiber with ceramic ferrule sleeve. By placing the HC-PCF into a vacuum chamber to decompress its pressure and subsequent sealing process, a HC-PCF low-pressure CO2 gas cell with the pressure less than 10 kPa is obtained. The insertion loss of this gas cell is approximately 3.5 dB, and the good air-tightness and long-term stability are observed. This kind of low-pressure HC-PCF gas cell may find broad applications in optical fiber gas sensing, laser frequency stabilization, and high resolution spectroscopy.