摘要
由于强的红外吸收,石英玻璃材料拉制成的光纤或微结构光纤在中红外波段的传输损耗很大。为产生中红外波段的超连续谱,须使用在该波段具有高透过率的非石英材料来拉制光纤或微结构光纤。碲化物材料本身具有高非线性,所以光纤色散设计是实现宽带、平坦超连续谱输出的重要条件。为了实现全光纤结构的超连续光源,选用1.55μm和2.0μm的光纤激光作为泵浦源。根据这两种泵浦系统和碲化物玻璃的材料色散特性,分别为这两种泵浦方案设计了两种波导结构——小纤芯直径和大纤芯直径的微结构光纤,并详细分析了各自的特点和应用范围。
Microstructured fibers made of silica undergo high loss in transmission due to the intrinsic material absorption in mid-infrared region. Non-silica glass materials are good candidates for fabricating microstructured fibers used for mid-IR supercontinuum generation because of their high transmittance in the region. Tellurite glass is a particularly attractive candidate due to its higher nonlinear coefficient. Dispersion design has an important effect on generating broadband and flat supercontinuum output. In order to achieve all-fiber mid-IR supercontinuum laser source, the tellurite microstructured fiber with fiber lasers operating at 1.55 ~m and 2.0 p,m was chosen as pumping source. According to the material dispersion characteristics of tellurite glass and two pumping systems, small and large core diameter microstructured fibers were designed for two waveguide structures. The characteristics and applications of the two microstructured fibers were introduced respectively.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第2期328-331,共4页
Infrared and Laser Engineering
基金
教育部新世纪优秀人才支持计划资助课题(NCET-08-0142)
关键词
中红外
超连续
碲化物微结构光纤
群速度色散
mid-infrared
supercontinuum
tellurite microstructured fibers
group-velocity dispersion
