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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。
The chalcogenide glass material has very high linear and nonlinear optical properties. Based on this, the chalcogenide fiber with suspended core structure has higher non-linearity than the silica glass fiber or common structural chalcogenide glass fiber. The zero-dispersion point Tunable and infrared transmission through the spectral width and other characteristics, so in the infrared band spectral broadening and chemical biosensing and other aspects have very important potential applications. According to the research and development of chalcogenide glass suspension core optical fiber and supercontinuum (SC) spectroscopy, a method of preparing four-hole chalcogenide glass suspension core optical fiber with ideal structure by extruding high-purity bulk chalcogenide glass is proposed. The new mechanical extrusion method ensures that the glass has stable properties and adjustable fiber structure. Sulfur-based suspension core fibers with low loss (loss of only 0.17 d B / m at a wavelength of 3.8 μm) were obtained, and in addition, the relative optical properties of the glass and the optical fiber were separately tested. The visible and infrared transmission properties of As2S3 glass and the transmission loss spectrum and transmission mode of the optical fiber were discussed. The optical fiber was pumped by the mid-infrared optical parametric amplification laser source (OPA), and the SC spectrum was obtained. The region up to 3000 nm (1500 ~ 4500 nm), theoretical broadening up to 6000 nm.