Composition Dependence of Spectroscopic Properties of Er^3＋ Doped TeO2-WO3-ZnO Glasses

Er^3 -doped TeO2-WO3-ZnO glasses were prepared and the absorption spectra, emission spectra and fluorescence lifetimes were measured. With more Te02 content in the glasses, the emission full width at half maximum (FWHM) increases while the lifetime of the ^4I13/2 level of Er^3 decreases. The stimulated emission cross-sectionof Er^3 calculated by the McCumber theory is as large as 0.86pm^2. The product of the FWHM and the emissioncross-section σe of Er^3 in TeO2-WO3-ZnO glass is larger than those in other glasses, which indicates that the glasses are promising candidates for Er^3 -doped broadband amplifiers. The Judd-Otfelt parameter Ω6 shows close composition dependence of the 1.5μm emission bandwidth. The more the TeO2 content is, the larger thevalues of Ω6 and FWHM.     

掺铒碲酸盐玻璃的光谱性质和能量传递

测试了掺Er碲酸盐玻璃在974nm LD泵浦下的吸收光谱、荧光光谱和上转换光谱,应用McCumber理论计算了Er3+的受激发射截面,分析了碲酸盐玻璃中Er3+离子的上转换发光机制,研究了Yb3+离子对Er3+离子上转换发光强度的影响以及两者之间的能量传递特性.     

Er3+和Yb3+共掺碲酸盐玻璃的光谱性质

研究了Er3+ 和Yb3+ 共掺碲酸盐玻璃的吸收和荧光光谱性质 ,分析了碲酸盐玻璃中Er3 + 的上转换发光机制 ,应用Judd Ofelt理论计算了玻璃的强度参量Ωt(t =2 ,4,6 ) ,分别为Ω2 =4.74× 10 - 2 0 cm2 ,Ω4=1.46× 10 - 2 0 cm2 ,Ω6 =0 .6 4× 10 - 2 0 cm2 ,计算了Er3+ 离子的自发跃迁几率、荧光分支比 ,应用McCumber理论计算了受激发射截面 ,并比较了Er3 + 在不同基质玻璃中的光谱特性。     

Er^3＋掺杂TeO2-WO3-ZnO—ZnF2玻璃的光谱性质

制备了Er^3 离子掺杂的TeO2-WO3-ZnO-ZnF2(TWZOF)玻璃，测试了样品的吸收光谱和970nmLD激发下样品中Er^3 离子的荧光光谱与荧光寿命，计算了Er^3 离子的J—O强度参数Ωt(t=2，4，6)和1．5μm波段的吸收截面与发射截面，研究了Er^3 离子1．5μm发射强度、荧光寿命和发射带宽与玻璃中ZnF2含量的关系。实验得到Er^3 离子在TWZOF玻璃中1．5μm发射的最大荧光半高宽(TwHm)为83nm；随着ZnF2含量的增加，Er^3 离子1．5μm发射强度、荧光寿命均增加。     

Determination of energy constants for Yb3＋/Er3＋ transfer and upconversion codoped phosphate glass

The energy transfer and cooperation upconversion processes are investigated in Yb3＋/Er3＋ codoped phos- phate glass. Based on the measured curves of output power versus incident power, the laser and spectroscopic parameters of the glass are fitted and analyzed. We focus on the resonant energy transfer constant k from Yb3＋ to Er3＋ as well as the cooperation upconversion coefficient Cup from 4113/2 of Era＋. The fitted k and Cup can give almost the same results for different thicknesses of glass disk with the same dop- ing concentrations. The determination of these parameters is helpful for the development of Yb3＋/Er3＋ codoped laser glass.     

Characterization of Amplified Spontaneous Emission from Er^3＋-Doped Tellurite Fibre

We present the characterization of amplified spontaneous emission (ASE) from newly fabricated Er^3 -doped tellurite fibres.When pumped at 98Ohm,a very broad erbium ASE in the range 1450-1650nm is observed.The changes of ASE with regard to fibre lengths and pumping power were measured.The output of 2mW from an Er^3 -doped tellurite fibre ASE source is obtained with the pump power of 540mW.     

Energy storage and heat deposition in Cr,Yb,Er co-doped phosphate glass

Energy storage and heat deposition in Cr,Yb,Er co-doped phosphate glass were reported. A model based on rate equations was used to determine the energy storage from the free-oscillating output energy characteristics. The heat deposition was calculated by measuring the temperature rise of the glass rod. The results provided important information for the glass operating in Q-switched mode, and also for calculating the temperature profiles and cooling requirements of the glass under single shot and repetitive pulsed conditions.     

Spectroscopic properties of Er3+-doped AlF3-La2O3-Al2O3-SiO2 glasses

Er3+-doped fluoride lanthanum aluminosilicate glasses with compositions of (65- x/2)SiO2 · (25 -and their glass transition temperatures and spectroscopic properties were investigated. The Ω2, Ω4, and Ω6 intensity parameters of glasses were calculated by Judd-Ofelt theory from absorption curves. It was found that glasses transition temperature and melting temperature decreased with the increase of fluoride content in glass, Ω2 decreased gradually with the increase of AlF3 content, but both Ω4 and Ω6 did not increase until AlF3 content increased to 30 mol%. The quantum efficiency of 4I13/2 to 4I15/2 transition of Er3+ ions increases with the increase of AlF3 content in glass. Fluorescent lifetime is longer in glass containing more AlFa content.     

LD泵浦的镱铒共掺磷酸盐玻璃的光谱性质和激光性质

制备了Er3+/Yb3+共掺磷酸盐玻璃。通过分析其吸收光谱,根据McCumber理论计算得到了Er3+离子在波长1533 nm处的峰值发射截面为0.84×10-20cm2,4I13/2能级的荧光寿命为8.5 ms。利用激光二极管作为泵浦源,成功地实现了Er3+/Yb3+共掺磷酸盐玻璃激光器的连续运转。在室温下,获得最大激光输出功率为80 mW,斜率效率为16.5%。     

钕离子浓度对受激发射截面的影响

 通过对N31型磷酸盐激光钕玻璃的6种钕离子浓度进行实验，采用Judd－Ofelt模型对样品进行分析，发现随着钕离子浓度的增加，受激发射截面逐渐减小。因此在激光系统设计中，应充分考虑钕离子浓度的影响。选择浓度合适的钕玻璃作为工作物质，可使激光系统性能达到最优。