摘要：为了研究宽带TEM_(22)模厄米-高斯光束通过受光阑限制色散会聚透镜系统的微米焦开关现象,采用数值计算方法对TEM_(22)模厄米-高斯光束的光强分布进行了分析,取得了传输轴上光强分布的数据。结果表明,带宽变化引起轴上TEM_(22)模厄米-高斯光束两个光强极大的相对大小改变,结果导致光强主极大位置跃变;当相对带宽γ=0.231且菲涅耳数F_(w)=100时,光强主极大位置跃变距离为2.5μm,出现微米焦开关现象;带宽和菲涅耳数是影响光束微米焦开关的重要因素;菲涅耳数较大时,较窄的带宽就可以诱导微米焦开关,反之则需要较宽的带宽。此研究结果有助于光通信技术中微纳光学器件的设计和制作。

摘要：为建立一个高效率的基模振荡器模型,采用谐振腔理论和ABCD定律计算分析了热透镜对腔内模式的影响,研究了不同泵浦源对斯托克斯因子的影响。研究结果表明,在热透镜焦距300-350mm范围内腔模变化较小,采用914nm泵浦源可以提高斯托克斯因子从而提高振荡器效率。设计的基模振荡器在泵浦功率为50 W时,可得到34.7 W的激光输出,效率达到69.4%。

摘要：专业课程体系是实现人才培养目标的重要保障。为实现我校集成电路设计专业人才培养目标,根据已提出的创新型集成电路设计人才培养模式,结合我校目前人才培养现状与特征,改革优化集成电路设计专业课程体系。提出"4+3+2"专业课程体系,并优化集成电路设计专业课程的授课内容。

摘要：In this paper, a refractive index profile design enabling us to obtain a flat modal field around the fibre centre is investigated. The theoretical approach for designing such multilayer large flattened mode （LFM） optical fibres is presented. A comparison is made between the properties of a three-layer LFM structure and a standard step-index profile with the same core size. The obtained results indicate that the effective area of the LFM fibre is about twice as large as that of the standard step-index fibre, but the LFM fibre has less effective ability to filter out the higher order modes than the standard step-index fibre with the same bending radius.