非均匀反射全息滤光片的调谐性能

从理论和实验两方面研究了反射全息滤光片的性能，结果表明，反射全息滤光片不仅具有高光密度（大于4D）和窄带宽，还具有很好的调谐性能，同时，对均匀介质和非均匀介质两种耦合液理论模型进行了比较分析，证明非均匀介质耦合波理论模型更加符合实验结果。     

BST/MgO复相陶瓷的制备与性能

以溶胶低温燃烧合成法制备了BaSr Ti O3超细粉末,与商品MgO纳米粉体同为原料,按质量比1∶1的比例制备了BST/MgO复相陶瓷材料。分别在1 150,1 200,1250℃,利用SEM、XRD和LCR对制备出的BST/MgO复相陶瓷的显微结构与介电性能进行了测试分析。结果表明,BaSr Ti O3/MgO复相陶瓷可在1 250℃烧结致密,烧结温度比固相法低150℃左右。介电常数下降至160左右,介电常数对偏压的调谐性达到20%以上（1 kV/mm）。     

Dielectric tunable properties of BaTi_4O_9-doped Ba_(0.6)Sr_(0.4)TiO_3 microwave composite ceramics

BaTi4O9-doped Ba0.6Sr0.4TiO3(BST) composite ceramics were prepared by the conventional solid-state reaction and their structure,dielectric nonlinear characteristics and microwave dielectric properties were investigated.The secondary phase of the orthorhombic structure Ba4Ti13O30 is formed among BST composite ceramics with the increase of BaTi4O9.At the same time,a duplex or bimodal grains size distribution shows fine grains in a coarse grain matrix.The degree of frequency dispersion of dielectric permittivity below Tm is increased initially and then decreased with respect to BaTi4O9.As the BaTi4O9 content increases,the tunability of composite ceramics decreases,while the Q value increases.Interestingly,70 wt%BaTi4O9-doped BST has a tunability～4.0%(under 30 kV/cm biasing) versus a permittivity～68 and quality factor ～134.1(at～3.2 GHz) .     

Dielectric properties of BST/MZO ceramic composites

Ba0.6Sr0.4TiO3/Mg1-xZnxO(MZO,x=0,0.05,0.10,0.15 and 0.20) ceramic composites were prepared by traditional ceramic processing.The crystal structure,fracture surface morphology,and dielectric properties were investigated.The samples with x=0,0.05 and 0.10 exhibited favorable sintering behavior,and homogeneous diphase microstructure was obtained. Nevertheless,the microstructure of the samples with x=0.15 and 0.20 was inhomogeneous and abnormal grain growth could be observed,and the abnormal grain growth induced the degradation of dielectric strength.The sample with x=0.10 has relatively low dielectric loss(1.26×10-3) and the optimal FOM value(about 174) .     

先微波可调谐超材料吸波体研究进展

 随着电磁波干扰防护技术与隐身技术的的发展,吸波材料已成为科学研究的重要课题。介绍了材料的吸波原理、吸波材料的分类及其特征,总结了超材料吸波体在微波频段的应用研究现状,综述了超材料作为可调谐吸波体的研究进展,展望了超材料在可调谐吸波体中的研究趋势。     

掺Yb3+环形光纤激光器的双波长可调谐特性

 通过构建基于非线性偏振旋转机理的掺Yb³⁺环形光纤激光器, 获得了等幅和非等幅两种双波长输出状态, 分别测量其输出功率. 结果表明, 由于不同波段激光增益的差别较大, 因此不同波长的转换效率相差较大.  分析了双波长输出的可调谐特性, 并考察了泵浦功率对1 029 nm和1 048 nm双波长输出的影响.   观察到2~7个波长的输出, 并测量了其泵浦功率区间及最大输出功率.