【摘要】 硫系玻璃材料具有极高的线性和非线性光学性能,在此基础上制备的悬吊芯结构的硫系光纤较之石英玻璃光纤或普通结构硫系玻璃光纤具备非线性更高、零色散点可调和红外透过光谱宽等特性,因此在红外波段的光谱展宽及化学生物传感等方面均具有非常重要的应用潜能。根据硫系玻璃悬吊芯光纤及超连续(SC)谱的研究发展,提出一种通过挤压高纯块状硫系玻璃制备理想结构的四孔硫系玻璃悬吊芯光纤的方法。该新型机械挤压法保证了玻璃性能稳定和光纤结构可调的特性。获得了低损耗(波长为3.8μm处的损耗仅为0.17 d B/m)的硫系悬吊芯光纤,此外分别测试了玻璃和光纤的相关光学性能。进一步讨论了As2S3玻璃样品的可见及红外透过性能及光纤的传输损耗谱、传输模式,利用中红外光参量放大激光光源(OPA)抽运光纤,获得了SC谱的产生,其展宽光谱在红外区域最宽可达3000 nm(1500~4500 nm),理论展宽可达6000 nm。更多还原

【Abstract】 The chalcogenide glasses are considered as a kind of good candidate for their characteristics of higher linearity and nonlinearity. Compared to common silica fibers and step- index chalcogenide glasses fibers,chalcogenide suspended-core fibers have better qualities in wider infrared transmitting, ultra-higher nonlinearity functioning and dispersion tailoring, so that it can be used in infrared laser spectrum broaden, chemical and biologic sensing popularly. First, the reviews are given for the developments of chalcogenide glasses fiber and laser supercontinuum generation; then, a few meters of four-hole suspended-core fibers are fabricated by a novel extrusion method which need only purified bulk chalcogenide glass for preparation. Here, the glasses thermal stability and tailored fibers geometry can be protected finely thanks to the novel extrusion method. In addition, the optical properties of glasses and fibers also are measured detailedly. With the help of optical spectra analysis, the visible and infrared transmitting of As2S3 samples, optical loss spectrum and light transmission spot diagrams in the fibers are discussed, respectively. A low-loss(0.17 d B/m at a wavelength of 3.8 μm) chalcogenide suspended-core fiber with a core diameter of 5.6 μm is obtained, and their supercontinuum generations are achieved under the pump of infrared optical parametric amplification(OPA) laser, the widest broadened spectrum in infrared region can be achieved up to 3000 nm(from 1500 to 4500 nm), and the value can be increased up to 6000 nm in theory with a more widen spectroscopic detector.更多还原