介质(Ag/AgI)镀层空芯玻璃光纤的制备及红外传输性能的研究

介质（Ａｇ／ＡｇＩ）镀层空芯玻璃光纤是一种较好的传输红外激光的柔性光纤材料．采用液相化学沉积法成功地制备了内径分别为１．０、０．５３、０．３２ｍｍ，长度为１．５ｍ的介质（Ａｇ／ＡｇＩ）镀层玻璃空芯光纤．利用傅里叶红外光谱仪和 ＬＪＬ－３５Ａ ＣＯ_２激光器分别测试了介质（Ａｇ／ＡｇＩ）镀层玻璃空芯光纤的传输损耗，测试结果表明：介质（Ａｇ／ＡｇＩ）镀层空芯玻璃光纤在２．５～２０μｍ波长范围内有较低的损耗值；随着光纤内径（α）的增大，空芯光纤的传输损耗（α）降低，这与Ｍｉｇａｇｉ理论（α　∝１／α^３）相符合．另外，由于光纤的注入端头发热致使介质（Ａｇ／ＡｇＩ）镀层空芯玻璃光纤的传输损耗随注入功率的增加而增大．

Preparation and IR Transmission Properties of Ag/AgI Hollow Glass Waveguides

Ag/AgI hollow glass waveguides are an attractive and flexible fiber for the delivery systems of IR radiation. By the liquid-phase chemistry deposition technique Ag/AgI hollow glass waveguides with a length of 1.5m and an inner diameter of 1.0, 0.53, 0.32mm, respectively, were successfully fabricated. With the cutback method the attenuation of waveguides was measured by using Infrared Fourier Translation Spectrometer (FTS--65A) and LTL--35A CO₂ laser. The results show that the attenuation (α) of Ag/AgI hollow glass waveguides is low within 2.5-20μm wavelength and decreases with the increment of the inner diameter(a) as α∝１／α^３ . Due to the heat on the insert end of waveguides the attenuation increases as the input power enlarges.