Tb3+-Yb3+离子对的近红外量子剪裁进展研究

近红外量子剪裁能够有效地提高硅太阳能电池的效率。稀土元素种类繁多,能级丰富,常被用于制作近红外量子剪裁发光材料。研究者们用适当的方法制成发光材料之后,测量材料的吸收光谱,激发光谱和发射光谱。根据这些数据计算得到材料的量子效率。其中Tb3+-Yb3+离子对备受关注。Tb3+吸收紫外-可见光,通过协同能量传递把能量传递给Yb3+离子。Yb3+离子跃迁辐射出1000nm左右的近红外光。该波段的光子能够被硅太阳能电池吸收利用。Tb3+-Yb3+离子对在不同掺杂浓度,不同基质中得到的量子效率不同。     

Ce3+-Yb3+共掺玻璃中频率下转换的理论模型研究

提出了一个Ce3+-Yb3+共掺玻璃系统中能量转移的理论模型,包括速率方程,功率传输方程和其他辅助方程。通过仿真,求得功率、量子转换效率分别为116.3%、136.2%。结果表明Ce3+-Yb3+共掺玻璃系统对于提高硅太阳能电池的转换效率非常有用。     

光通信用Er3+∶Yb3+共掺玻璃波导放大器

介绍了 Er3 +∶ Yb3 +共掺玻璃波导放大器 ( EDWA)的原理、结构、制备及其优势与局限 ,同时还介绍了多种基于 EDWA的集成放大器件以及它们在城域网 /接入网、CATV等光通信领域的应用     

光通信用Er3+∶Yb3+共掺玻璃波导放大器

介绍了Er^3 :Yb^3 共掺玻璃波导放大器（EDWA）的原理、结构、制备及其优势与局限,同时还介绍了多种基于EDWA的集成放大器件以及它们在城域网／接入网,CATV等光通信领域的应用。     

Er3+-Yb3+共掺DBR光纤激光器的实验研究

采用Er3 -Yb3 共掺单模光纤制作了DBR光纤激光器,有源光纤长度为10cm,光纤激光器为短腔结构.通过对不同前腔镜反射率的Er3 -Yb3 共掺DBR光纤激光器进行实验,得到了前腔镜反射率与激光器输出功率和阈值电流之间的关系,并对前腔镜反射率和有源光纤的长度的最优化选择进行了分析.     

Er3+/Yb3+共掺磷酸盐玻璃光纤放大器的增益综述

主要从磷酸盐玻璃光纤的离子掺杂浓度、量子转换效率、信号波长与功率、抽运波长与功率以及光纤长度等方面概述了Er3+/Yb3+共掺磷酸盐玻璃光纤放大器的增益.并简要介绍了国外在该方面的研究进展.     

Pr3+/Yb3+共掺碲酸盐玻璃发光特性的研究

根据Pr3 /Yb3 共掺碲酸盐玻璃在 980nm附近的吸收谱及 1.3 1μm处的发射谱 ,研究了玻璃样品光谱特性随稀土离子浓度变化的规律。结果表明 :在Yb3 离子浓度不变的情况下 ,1.3 1μm处的发光随着Pr3 离子浓度的增加 ,其强度先增后减 ,并在浓度为 0 .15mol%时达到最大值 ,同时根据Judd -Ofelt理论计算了稀土离子的光辐射特性     

Er3+/Yb3+共掺双包层光纤与掺Yb3+光纤中上转换效应实验研究

报道了Er3+/Yb3+共掺双包层光纤中由于上转换效应产生的荧光现象,并将此荧光与掺Yb3+光纤中产生的绿色荧光进行了详细测量和对比分析,结果表明,Er3+/Yb3+共掺双包层光纤中的绿色荧光仍然是Er3+离子激发态吸收所产生,而Yb3+只起到能量搬运的作用,两种光纤受激产生的荧光光谱、功率,及其随泵浦功率的变化关系,都遵循不同规律。     

Er3+∶Yb3+共掺磷酸盐波导激光器的新型数值模拟

文章系统地研究了Er3 ∶Yb3 共掺磷酸盐玻璃波导的性质, 在稳态情况下建立并求解其准三能级系统的速率方程.利用数值分析的方法模拟了980 nm二极管激光器抽运时输出光功率的特性.计算结果表明:经过优化分析,得到了较高的输出光功率和斜率效率,其阈值功率也比较低.     

Er3＋-Yb3＋共掺杂环形腔光纤激光器

运用Er3 -Yb3 共掺杂光纤作为激光增益介质，采用1．064μm的Nd：YAG激光器作为泵浦源，实现了2m和1m长环形腔光纤激光器运转。输出波长1．53μm，输出功率分别为7．8mW和6．2mW，斜率效率分别达到了6．4％和5．2％。     

Spectroscopy of different sites in Pr3+-doped oxyfluoride glass ceramics

Praseodymium doped oxyfluoride glass has been treated at 725 °C for 4 h to form LaF₃ nanocrystals in the amorphous matrices. Absorption, emission, and excitation spectra of the glass ceramics are presented at different concentrations of Pr³⁺ (0.01–1 at.%) and at different temperatures. Spectral and dynamical properties of Pr³⁺ in nanocrystals and glass have been investigated through selective excitation. Temperature and concentration effects have also been discussed.     

Pr3+/Nd3+ codoped tellurite glass for O+E+S-band broad emission

In this work, Pr3+ was introduced into Nd3+-doped tellurite glass with composition TeO2-ZnO-Na2O-Nb2O5 to achieve broadband near-infrared emission. A broadband fluorescence emission ranging from 1 250 nm to 1 530 nm was obtained under the excitation of 808 nm LD, which is contributed by the Pr3+:1D2 →1G4 and Nd3+:4F3/2→4I13/2 transitions emitting the fluorescence located at around 1.47 µm and 1.35 µm bands, respectively. The 1.47 µm band fluorescence of Pr3+ is attributed to the energy transfer from Nd3+ to Pr3+ ions and the energy transfer mechanism was further investigated by calculating relevant micro-parameter and phonon contribution ratio. Meanwhile, the studied tellurite glass possesses good thermal stability. The present work indicates that Pr3+/Nd3+ codoped tellurite glass is an excellent gain medium for potential O+E+S-band broad optical amplifiers.     

Tunable Pr/sup 3+/-Yb/sup 3+/-doped all-fiber upconversion laser

Fiber lasers in the visible spectral range at 603 and 634 nm were demonstrated using upconversion in fluoride Pr/sup 3+/-Yb/sup 3+/-doped fibers and Bragg gratings photoinduced in germanosilicate fibers. Reliable fine tuning of the all-fiber laser over 6.9 at 603 nm has been demonstrated using high strength fiber Bragg gratings.     

Er3+:Yb3+共掺玻璃波导放大器及其应用

介绍了Er 3+:yb 3+共掺玻璃波导放大器(EDWA)的原理、结构、制备及其优势与局限,同时还介绍了多种基于EDWA的集成放大器件以及它们在城域网/接入网、C盯V等光通信领域的应用.     

全光纤化高效Er3+-Yb3+共掺光纤放大器的实验研究

对全光纤化高功率Er<'3+>-Yb<'3+>共掺光纤(EYDF)放大器进行了实验研究.采用小芯径双包层EYDF作为增益介质,多模高功率915 nm半导体激光器作为泵浦源,实现了EYDF放大器的全光纤化.对分布反馈(DFB)激光器输出的窄带信号进行放大,得到了斜率效率约为27.2%、最高2.14 W的高功率输出;实验中...     

铒镱共掺铋磷酸盐玻璃光谱性能的研究

基于光通信技术发展对光放大器材料的带宽要求,研究了掺铒铋磷酸盐玻璃的结构、熔制性能,以及其光谱性能,并且用Judd-Ofelt理论进行了光谱计算分析。得到了一种以铋磷酸盐为基质的光放大器玻璃材料,其折射率为1.778,荧光半峰全宽为54nm,发射截面为0.61×10-20cm2,其荧光寿命达到了8ms。结果表明,铒镱共掺铋磷酸盐玻璃是一种良好的宽带放大器材料。     

铒镱共掺磷酸盐玻璃波导放大器及上转换性质

研究了采用离子交换和电场辅助退火法制作的铒镱共掺磷酸盐波导放大器的增益特性,测量了Er2O3,Yb2O3掺杂浓度分别为2.2wt%和4.7wt%,长度为1.2cm的器件增益,在130mW,976nm泵浦光泵浦下,输入信号光功率小于1mW时,在1535nm处得到8.5dB的小信号相对增益;当泵浦功率为30mW时,可观测到绿色的上转换辐射光,发光强度随泵浦功率增加而增大;通过单色仪和光电倍增管接收此光,确定是铒粒子由2H11/2和4S3/2能级分别跃迁至基态的上转换辐射光.     

Effect of B2O3 on the spectroscopic properties in Er3+/Ce3+ co-doped tellurite-niobium glass

The high phonon energy oxide of B2O3 is introduced into the Er3+/Ce3+co-doped tellurite-niobium glasses with composition of TeO2-Nb2O5-ZnO-Na2O.The absorption spectra,1.53 μm band fluorescence spectra,fluorescence lifetime and Raman spectra of Er3+in glass samples are measured together with the calculations of Judd-Ofelt spectroscopic parameter,stimulated emission and absorption cross-sections,which evaluate the effect of B2O3 on the 1.53 μm band spectroscopic properties of Er3+.It is shown that the introduction of an appropriate amount of B2O3 can further improve the 1.53 μm band fluorescence intensity through an enhanced phonon-assisted energy transfer(ET) between Er3+/Ce3+ions.The results indicate that the prepared Er3+/Ce3+co-doped tellurite-niobium glass with an appropriate amount of B2O3 is a potential gain medium for the 1.53 μm bandbroad erbium-doped fiber amplifier(EDFA).     

Gain measurement and upconversion analysis in Tm3+, Ho3+ co-doped alumino-zirco-fluoride glass

The small signal gain coefficients were measured in Tm³⁺,Ho³⁺ co-doped alumino-zirco-fluoride glass. A gain of 15%/cm at 2.05 μm was obtained for pump power density of 42 kW/cm². The temperature increase of the glass was found to be more than 150 K with this pump power, which was estimated from a comparison between fluorescence intensities of Tm^{3+ 3} F₄-³H₆ and Ho^{3+ 5} I₇-⁵I₈. An upconversion rate constant of 12.5×10^-17 cm³ sec^-1 from a coupled (Tm^{3+ 3}F₄, Ho^{3+ 5}I₇) level to a coupled (Tm^{3+ 3}H₅, Ho^{3+ 5}I₆) level was determined by fitting the experimentally obtained gain coefficients to the calculated one which takes into consideration any temperature increase     

Ag NPs induced near-infrared emission enhancement of Er3+/Tm3+ codoped tellurite glass

Ag nanoparticles(NPs) were introduced into Er³⁺/Tm³⁺ codoped tellurite glasses prepared using melt-quenching and heat-treated techniques. The glass samples were characterized by the differential scanning calorimeter(DSC), X-ray diffraction(XRD), transmission electron microscopy(TEM) and photoluminescence to reveal the Ag NPs induced broadband near-infrared band emission enhancement of Er³⁺/Tm³⁺ ions. The studied glasses possessed good thermal stability with△T larger than 137 ℃. For glass sample heat-treated at 360 ℃ for 6 h, the nucleated Ag NPs in near-spherical shape with an average diameter about 6.5 nm dispersed in the glass matrix. Under the excitation of 808 nm laser diode(LD), the broadband near-infrared fluorescence emission extending from 1 350 nm to 1 620 nm, owing to the combined contributions from the ³H₄→³F₄ transition of Tm³⁺ at 1.47 μm band and the ⁴I_13/2→⁴I_15/2 transition of Er³⁺ at 1.53 μm band, improved significantly with the introduction of Ag NPs, which is mainly attributed to the increased local electric field. The present results indicate that Er³⁺/Tm³⁺/Ag NPs codoped tellurite glass with good thermal stability is a promising glass material for broadband fiber amplifiers of WDM transmission systems.