Yb~(3+),Er~(3+)共掺磷酸盐铒玻璃光谱性质研究

研究了Yb3+ ,Er3+ 共掺磷酸盐铒玻璃的吸收光谱和荧光光谱性质。通过测定和计算各种Yb3 + ,Er3 + 共掺磷酸盐铒玻璃光谱参数 ,初步探明了Yb3+ 离子浓度、碱金属氧化物R2 O(R =Li,Na ,K)和碱土金属氧化物MO(M =Zn ,Mg ,Ca,Ba)的引入及网络生成体P2 O5 的含量对Yb3 + ,Er3 + 共掺磷酸盐铒玻璃光谱性质的影响。在Yb3+ ,Er3+共掺磷酸盐铒玻璃中实现了Er3+ 荧光寿命达 7 5ms,受激发射截面为 0 8× 10 - 2 0 cm2 的光谱特性 ,为今后该玻璃的激光实验提供了重要参数     

大模场光子晶体光纤研究进展

大模场光子晶体光纤具有无截止单模运转和大模场面积特性,可以克服由激光功率密度过高引起的非线性效应对高功率系统尤其是超快脉冲系统的限制。近年来它在高功率光纤激光器、高功率光纤放大器、高功率能量传输以及高灵敏度传感器等领域引起广泛关注。回顾了大模场光子晶体光纤的研究历程,从大模场光子晶体光纤的特征参数、结构设计方法和应用热点等方面总结了大模场光子晶体光纤的研究现状,最后对其发展前景进行了展望。     

掺Er3+氟铅硅酸盐玻璃的光谱性质和热稳定性研究

制备了掺Er^3 氟铅硅酸盐玻璃，研究了玻璃的物理性质、热稳定性、吸收光谱、荧光光谱和荧光寿命，应用McCumber理论，计算了能级^4I13／2→^4I15／2跃迁的吸收和受激发射截面．结果表明：以PbF2等分子替代PbO含量，样品密度、折射率、热稳定性、吸收截面和受激发射截面降低，但荧光半高宽和荧光寿命增加，对Er^3 离子在不同玻璃基质中带宽特性的比较发现，Er^3 掺杂50SiO2—50PbF2玻璃的带宽特性与碲酸盐和铋酸盐玻璃相当，大于磷酸盐，锗酸盐和硅酸盐玻璃，表明掺Er^3 氟铅硅酸盐玻璃可作为宽带光纤放大器的基质材料。     

Highly Er3+/Yb3+ Co-Doped Fluoroaluminate Glasses for Microchip Laser at 1.54 μm

A series of highly Er3 /Yb3 co-doped fluoroaluminate glasses were investigated in order to develop a microchip laser at 1.54 μm under 980 nm excitation. Measurements of absorption, emission and up-conversion spectra were performed to examine the effect of concentration quenching on spectroscopic properties. In the glasses with Er3 concentrations below 10% (mol fraction), concentration quenching is low and the Er3 /Yb3 co-doped fluoroaluminate glasses gave stronger fluorescence of 1.54 μm from the 4I13/2→ 4I15/2 transition than those of Er3 singly-doped glasses. In the glass with Er3 concentrations above 10%, concentration quenching of 1.54 μm obviously occurs more than that of the Er3 singly-doped samples because of the back energy-transfer from Er3 to Yb3 . To obtain the highest emission efficiency at 1.54 μm, the optimum in mol fraction when the Er3 concentration is less than 10%.     

Upconversion Emission in Er^3＋ Doped Novel Bismuthate Glass

Novel Er3 -doped bismuth lead strontiam glass was fabricated and characterized, and the absorption spectrum and upconversion spectrum of the glass were studied. The Judd-Ofelt intensity parameters Ωt (t=2, 4, 6) were found to be Ω2＝3.27×10-20 cm2, Ω4＝1.15×10-20 cm2, and Ω6＝0.38×10-20 cm2. The oscillator strength, the spontaneous transition probabilities, the fluorescence branching ratios, and excited state lifetimes were also measured and calculated. The upconversion emission intensity varies with the power of infrared excitation intensity. A plot of log Iup vs log IIR yields a straight line with slope 1.86, 1.88 and 1.85, corresponding to 525, 546, and 657 nm emission bands, respectively, which indicates that a two-photon process for the red and green emission.     

P2O5-BaO-Nb2O5三元系统玻璃的形成及性能的研究

研究P     

用于WDM系统的掺稀土玻璃光纤

作为新的光纤放大器增益介质，掺稀土玻璃光纤近年来在WDM传输系统中发展迅速。在介绍了玻璃光纤用作光纤放大器增益媒质优点的基础上，综述了目前掺稀土玻璃光纤研究的要点、种类、性能及其应用实例。     

远红外Ge-Ga-Te-Cu硫系玻璃光学性能研究

采用传统的熔融-淬冷法制备了一系列Cu改良后的GeTe4-Ga2Te3玻璃样品,利用X射线衍射(XRD)、扫描电子显微镜(SEM)、差热分析(DTA)、分光光度计和红外透射光谱仪等研究了系统玻璃组成、结构和光学特性,应用经典的Tauc方程计算了样品光学带隙允许的间接跃迁。实验结果表明,玻璃的密度和摩尔体积都随着Cu含量的增加而减小,短波吸收截止边发生红移,光学带隙减小;(GeTe4)68(Ga2Te3)26Cu6玻璃具有最好的热稳定性,ΔT(=Tx-Tg,即玻璃的析晶温度值Tx与玻璃转变温度值Tg的差值)为103℃所有的玻璃样品都有很宽的红外透过窗口,红外截止波长都超过了20μm,表明Te基硫系玻璃材料在远红外应用方面有着巨大的潜在开发     

红外硫系玻璃内部宏观缺陷透视成像检测系统

红外硫系玻璃透射率高,光谱范围宽,可广泛应用于红外热像仪等光学系统,然而红外玻璃在熔制过程中容易因组分不均匀造成各种内部缺陷,影响成像质量。利用透视成像的原理,在分辨力估算的基础上,设计了一种可检测玻璃内部宏观缺陷的系统。这种系统光源功率可调,可以检测厚度和直径都在几毫米到几十毫米范围内的红外硫系玻璃,在300mm成像距离条件下分辨尺寸达到0.19mm,并且可对长度63.4mm的物体成满像。通过Sobel算子进行玻璃内部条纹边缘提取,可以获得更加清晰的条纹特征。     

氯化铯对GeSe_2-Sb_2Se_3玻璃的析晶及红外透过性能的影响

采用熔融-急冷法制备了20GeSe2-(80-x)Sb2Se3-xCsCl(x-2,4,6,8和10,以摩尔计)系列玻璃样品,用热膨胀仪、棱镜耦合仪、差热分析仪等测试了样品的密度、线膨胀系数、折射率、玻璃转变温度T8和析晶开始温度Tx等.讨论了氯化铯(CsCl)对玻璃的热力学性能和红外光学性能的影响.利用修正的Ozawa方程计算了玻璃的析晶活化能Ec.研究表明:CsCl含量增加使玻璃的密度P和折射率n,Tg,Tx,△T(Tx-Tg)下降,Ec也随之降低;CsCl的引入在一定范围内易导致玻璃析晶;随着CsCl含量的增加,玻璃的近红外短波限产生了略微的蓝移,红外长波截止波长基本无变化.