Absorption efficiency of graded-index double-clad fiber lasers or amplifiers is analyzed. As ray optics method is no longer valid for graded-index case, the mode analysis method is used. Calculated results show that a...Absorption efficiency of graded-index double-clad fiber lasers or amplifiers is analyzed. As ray optics method is no longer valid for graded-index case, the mode analysis method is used. Calculated results show that absorption efficiency for a graded-index is higher than that for a step-index in symmetric case. In offset core case, the graded-index can achieve the same absorption efficiency with much smaller offset distance. Absorption efficiencies for different graded-index profiles of the inner cladding are compared.展开更多
采用扫描电镜、傅里叶变换红外光谱仪、差示扫描量热仪、X射线衍射仪、热失重分析仪、单纤维强力仪等对瓶片涤纶全拉伸丝(FDY)与切片涤纶FDY的结构与性能进行表征与比较。结果表明:纤维表面均比较光滑,但瓶片涤纶FDY表面存在少量颗粒凸...采用扫描电镜、傅里叶变换红外光谱仪、差示扫描量热仪、X射线衍射仪、热失重分析仪、单纤维强力仪等对瓶片涤纶全拉伸丝(FDY)与切片涤纶FDY的结构与性能进行表征与比较。结果表明:纤维表面均比较光滑,但瓶片涤纶FDY表面存在少量颗粒凸起,在分子结构上两者无明显区别,瓶片涤纶FDY和切片涤纶FDY的结晶度分别为37.86%,37.24%;瓶片涤纶FDY的熔点为240℃,切片涤纶FDY的熔点为260℃;瓶片涤纶FDY的断裂强度为3.638 c N/dtex,切片涤纶FDY断裂强度为3.792 c N/dtex,其力学性能相差不大,但经热处理和日晒后,瓶片涤纶FDY的断裂强度下降程度略大于切片涤纶FDY;瓶片涤纶FDY和切片涤纶FDY都具有较好的染色性能,上染率分别为88%和90%。展开更多
文摘Absorption efficiency of graded-index double-clad fiber lasers or amplifiers is analyzed. As ray optics method is no longer valid for graded-index case, the mode analysis method is used. Calculated results show that absorption efficiency for a graded-index is higher than that for a step-index in symmetric case. In offset core case, the graded-index can achieve the same absorption efficiency with much smaller offset distance. Absorption efficiencies for different graded-index profiles of the inner cladding are compared.
文摘采用扫描电镜、傅里叶变换红外光谱仪、差示扫描量热仪、X射线衍射仪、热失重分析仪、单纤维强力仪等对瓶片涤纶全拉伸丝(FDY)与切片涤纶FDY的结构与性能进行表征与比较。结果表明:纤维表面均比较光滑,但瓶片涤纶FDY表面存在少量颗粒凸起,在分子结构上两者无明显区别,瓶片涤纶FDY和切片涤纶FDY的结晶度分别为37.86%,37.24%;瓶片涤纶FDY的熔点为240℃,切片涤纶FDY的熔点为260℃;瓶片涤纶FDY的断裂强度为3.638 c N/dtex,切片涤纶FDY断裂强度为3.792 c N/dtex,其力学性能相差不大,但经热处理和日晒后,瓶片涤纶FDY的断裂强度下降程度略大于切片涤纶FDY;瓶片涤纶FDY和切片涤纶FDY都具有较好的染色性能,上染率分别为88%和90%。
