Broadband 1.5-μm emission of erbium-doped TeO2-WO3-Nb2O5 glass for potential WDM amplifier

Erbium-doped glass showing the wider 1.5-/μm emission band is reported in a novel oxide system TeO2-WO3-Nb2O5 and their thermal stability and optical properties such as absorption,emission spectra,cross-sections and fluorescence lifetime were investigated.Compared with other glass hosts,the gain bandwidthproperties of Er3+ in TWN glass is close to that of bismuth glasses,and larger than those of tellurite,germanatc,silicate and phosphate glasses.The broad and flat 4I13/2 → 4I15/2 emission and the largestimulated emission cross-section of Er3+ ions around 1.5 μm can be used as host material for potentialbroadband optical amplifier in the wavelength-division-multiplexing(WDM)network system.     

Spectroscopic properties of neodymium-doped tellurite glass fiber

Nd3+-doped tellurite glass and a single mode tellurite glass fiber with a core diameter of 8 μm were prepared in this work. The 1.33-μm emission from the 4F3/2→4I13/2 transition of Nd3+ with a spectral bandwidth of 55 nm in tellurite glass fiber is observed.The lifetime of 164μs of 4F3/2 level and quantum efficiency of about 100 ％ are obtained.     

Amplified spontaneous emission properties of a single mode Er~(3+)-doped tellurite fiber

Spectral characteristics of the amplified spontaneous emission (ASE) from a novel single mode Er~(3+) doped tellurite fiber with D-type cladding is reported in this letter. When pumped at 980 nm, an ASE source that has nearly a 100-nm flat FWHM bandwidth is obtained with a fiber length of 30-60 cm. Variation of ASE spectra with pump powers and fiber lengths are measured. Output power up to 2.0 mW is obtained with a launched pump power of 660 mW.     

Fabrication of crystalline selenium microwire

A method of fabricating selenium(Se) microwire is demonstrated.A multimaterial fiber with amorphous selenium(a-Se) core and multicomponent phosphate glass cladding is drawn by using a conventional optical fiber drawing technique.Then the a-Se core of the fiber is crystallized by a post thermal process at 150 ℃.After the multicomponent phosphate glass cladding is stripped from the multimaterial fiber by marinating the fiber in HF acid solution,a crystalline selenium(c-Se)microwire with high uniformity and smooth surface is obtained.Based on microstructure measurements,the c-Se microwire is identified to consist of most hexagonal state particles and very few trigonal state whiskers.The good photoconduction property of c-Se microwire with high quality and longer continuous length makes it possible to apply to functional devices and arrays.     

GeO2含量对掺铒锗碲酸盐玻璃物性和光谱特性的影响

本文研究了x GeO₂-(70-x)TeO₂-5K₂O-5Na₂O-10Nb₂O₅-10ZnO-0.2Er₂O₃(x=0,10, 25, 50, 70(摩尔百分数))玻璃的物性和光谱特性，讨论GeO₂含量对锗碲酸盐玻璃物性和光谱特性的影响.研究发现：GeO₂的加入提高了碲酸盐玻璃热稳定性， 关键词： 锗碲酸盐玻璃 玻璃热稳定性 荧光     

荧光捕获效应对Yb3+磷酸盐玻璃光谱性质的影响

测试了不同掺杂浓度和不同厚度下Yb3+ 磷酸盐玻璃的吸收光谱、荧光光谱和荧光寿命 ,计算了积分吸收截面、吸收截面、受激发射截面、自发辐射寿命以及荧光有效线宽等光谱参数 ,讨论了荧光俘获效应对Yb3+ 磷酸盐玻璃光谱性质的影响 .结果表明荧光俘获效应随样品厚度和掺杂浓度的增加而增大 .由于荧光俘获效应的存在使得测量的Yb3+ 磷酸盐玻璃荧光寿命明显长于计算的荧光寿命 ,在 0 2mol%Yb2 O3低掺杂浓度下采用不同厚度 ( <4mm)的样品测量的荧光寿命之间误差为 3 0 %左右 ,高浓度 ( 6mol%Yb2 O3)掺杂下误差可达 43 % .荧光俘获还造成荧光谱线加宽 ,导致荧光有效线宽在低浓度 ( 0 2mol%Yb2 O3)时增加 14% ,在高掺杂浓度 ( 6mol%Yb2 O3)下增加 3 0 %以上     

Broadband Near-Infrared Emission from Transparent Ni^2＋ -Doped Sodium Aluminosilicate Glass Ceramics

Broadband near-infrared emission from transparent Ni^2＋-doped sodium aluminosilicate glass-ceramics is observed. The broad emission is centred at 1290nm and covers the whole telecommunication wavelength region （1100- 1700hm） with full width at half maximum of about 340hm. The observed infrared emission could be attributed to the 3T2（F） → 3A2（F） transition of octahedral Ni^2＋ ions that occupy high-field sites in nanocrystals. The product of the lifetime and the stimulated emission cross section is 2.15 × 10^-24 cm^2s. It is suggested that Ni^2＋- doped sodium aluminosilicate glass ceramics have potential applications in tunable broadband light sources and broadband amplifiers.     

Tb3+掺杂高密度锗酸盐闪烁玻璃的发光性质

采用高温熔融法制备了Tb³⁺掺杂高密度锗酸盐玻璃。分别测试了该玻璃的透过光谱、密度、荧光光谱、荧光寿命及X射线激发发光光谱,揭示了该玻璃的物理化学性质和发光性质。透过光谱表明该玻璃具有良好的可见光透过率。高含量的Lu₂O₃和Gd₂O₃使得玻璃的密度高达6.4 g/cm³。该玻璃在377 nm光和X射线激发下发出强的绿光。544 nm发光的荧光寿命为1.325~1.836 ms。研究结果表明,Tb³⁺掺杂高密度锗酸盐玻璃是一种可用于慢速事件X射线探测器的候选闪烁材料。     

Ti4+掺杂硼硅酸盐微晶玻璃的光谱特性

制备了Ti4+掺杂硼硅酸盐玻璃,根据玻璃样品的差热分析(DTA)进行微晶化处理,测试了Ti4+掺杂硼硅酸盐微晶玻璃的X射线衍射(XRD)谱、透射电镜(TEM)图像、吸收光谱和发射光谱.根据Scherrer公式计算了BaYF5微晶的平均晶粒尺寸并与TEM图像进行比对.在紫外光激发下,观察到Ti4+掺杂BaYF5硼硅酸盐微...     

122-W high-power single-frequency MOPA fiber laser in all-fiber format

We demonstrate a high-power single-frequency master oscillator power amplifier (MOPA) fiber laser.The central wavelength of the single-frequency fiber laser seed is 1 063.8 nm,with a linewidth narrower than 20 kHz and output power of 120 mW.By using two-stage amplification,a single-frequency fiber laser with an output power of 122 W is obtained,and the optical-optical conversion efficiency is 72%.No significant amplified spontaneous emission (ASE) or stimulated Brillouin scattering (SBS) is observed.The output power can be further increased by launching more pump power.