Dy3+掺杂Ga-Sb-La-S新型硫系玻璃和光纤制备及中红外发光特性

制备了一系列新型Ga2 S3-Sb2S3-La2S3硫系玻璃,研究了玻璃的热学和光学性能;向优化的玻璃中掺杂Dy3+,研究了玻璃的中红外发光性能;基于优化的玻璃组成,拉制了纤芯/包层结构光纤,评估了其作为中红外激光增益介质的潜力.实验结果表明,Ga2S3-Sb2S3-La2S3玻璃具有宽的红外透过范围(约0.7 ～13.6 μm)和高的线性折射率(约2.655 ～2.707),组成为20Ga2 S3-75Sb2 S3-5La2S3的玻璃具有最佳的抗析晶热稳定性.Dy3+掺杂的玻璃在2.95 μm和4.40 μm具有较高的发光量子效率和较大的受激发射截面.拉制的20Ga2 S3-75Sb2S3-5La2 S3∶0.05wt％Dy3 +/20Ga2 S3-74Sb2 S3-6La2 S3光纤透光范围为2～8 μm,其背景损耗＜8 dB/m.在1.32 μm波长激发时,光纤显示出强的中红外发光.这些优异性能表明该玻璃光纤有望成为一种高效的中红外激光增益材料.     

Tm3+掺杂Ge-Ga-Se-CsI玻璃中红外发光和增益特性研究

用熔融急冷法制备了系列Tm3+掺杂浓度的Ge-Ga-Se-CsI硫卤玻璃样品,通过测试的吸收光谱和Judd-Ofelt 理论计算了Tm3+离子的强度参数(Ωi,i=2,4,6)、自发辐射跃迁几率(A)、荧光分支比(β)、以及辐射寿命(Trad)等光谱参数.研究了800 nm激光泵浦下样品红外荧光特性与掺杂浓度之间的关系,计算了常温下Tm3+:3 F4→3 H6(1.8 μm)和3H5→3F4(3.8μm)发射截面以及3F4→3H6(1.8 μm)跃迁的增益截面与波长的函数关系.     

Tm3+/Ho3+共掺碲酸盐玻璃中Tm3+交叉弛豫主导的2.0μm发光特性

研究了不同摩尔分数Tm3 掺杂下Tm3 /Ho3 共掺碲酸盐玻璃在2.0μm处的发光特性.此发光包括两个过程:Tm3 之间的交叉弛豫过程;通过Tm3 与Ho3 之间的能量转移,将能量传递给Ho3 而使Ho3 跃迁至5I7能级上产生布居,当Ho3 跃迁回基态时则发出波长为2.0μm的光.计算了Tm3 的交叉弛豫速率,并根据速率方程分析了Tm3 的交叉弛豫机理.结果表明:随着Tm3 浓度增加,交叉弛豫逐渐增强;2.0μm处发光的强度逐渐增强.证明了在Tm3 /Ho3 共掺情况下,2.0μm处的发光强度取决于Tm3 的交叉弛豫强度.     

中红外发光稀土掺杂硫系玻璃的研究进展

2～5μm波段中红外激光在遥感、测距、环境检测、生物工程和医疗等领域有着广阔的发展前景和重要的应用价值,己成为光电子技术领域中最尖端的课题之一.利用固体激光器泵浦稀土离了掺杂的硫系玻璃光纤产生荧光发射是直接获得2～5μm波段中红外激光的有效途径.综合评述了近年来国外在中红外发光稀土离子掺杂硫系玻璃方面的研究进展,讨论了影响硫系玻璃中红外发光的各种因素,展望了未来该领域的研究方向和发展前景.     

Dy3+掺杂Ge-Ga-Se硫系玻璃的性质

实验制备了Dy3+掺杂Ge-Ga-Se系统硫系玻璃样品,测试了玻璃的密度、显微硬度、可见-红外透射光谱、荧光光谱以及荧光寿命.根据玻璃的密度计算了玻璃的摩尔体积以及致密度.讨论了玻璃的这些性能随系统平均配位数＜r＞的变化关系.实验结果表明该系统中配位数大于2.67的玻璃在1.3 μm具有较好的发光性能,荧光寿命在440～530μs之间,当玻璃组成位于化学门槛即平均配位数为2.73时玻璃的发光强度最强.     

Yb~(3+)/Ho~(3+)共掺Ge_(25)Ga_5S_(70)玻璃中红外发光特性

用熔融急冷法制备了系列Yb3+/Ho3+共掺Ge25Ga5S70硫系玻璃,测试了样品的吸收光谱以及980nm激光泵浦下中红外荧光光谱特性,用Judd–Ofelt理论计算分析了单掺Ho3+在Ge25Ga5S70玻璃中的强度参数Ωi(i=2,4,6)、自发辐射跃迁几率、荧光分支比和辐射寿命等光谱参数。研究了Yb3+/Ho3+共掺样品在980nm激光泵浦下获得的Ho3+:2.9μm中红外荧光光谱性质,表明Yb3+/Ho3+之间存在能量共振转移。当固定Yb3+掺杂浓度为0.5%(质量分数,下同),随着Ho3+掺杂浓度从0增加为0.7%,Yb3+:2F5/2能级寿命明显单调下降,说明Yb3+/Ho3+之间有效的能量传递主要来源于Yb3+:2F5/2能级向Ho3+:5I6能级的共振能量传递。运用Futchbauer-Ladenburg公式计算比较了不同掺杂浓度下Ho3+:5I6→5I7跃迁的受激发射截面。     

硫系玻璃红外光纤

本文简述了硫系玻璃的种类、性质以及硫系玻璃原料的常用几种提纯方法,概括介绍了玻璃的熔制以及光纤和传像束的制备方法,并讨论了硫系玻璃光纤在民用、医学、军事领域上的应用及发展前景.     

硫系玻璃红外光纤

本文简述了硫系玻璃的种类、性质以及硫系玻璃原料的常用几种提纯方法,概括介绍了玻璃的熔制以及光纤和传像束的制备方法,并讨论了硫系玻璃光纤在民用、医学、军事领域上的应用及发展前景.     

稀土掺杂中红外硫系光纤及其传感应用研究进展

中红外光源在国防安全、食品安全、光谱分析等军事或国民经济的重要行业有着重要的应用.近年来,稀土离子掺杂硫系玻璃和光纤的研究主要集中在提高稀土离子溶解度、降低稀土离子局域声子能量和敏化离子共掺等方面.在玻璃和光纤中获得了Dy3+、Pr3+、Dy3+、Tb3+、Sm3+等稀土离子的中红外荧光,这种宽带中红外荧光在传感领域得...     

Er~(3+)掺杂GeS_2-Ga_2S_3-CsI微晶玻璃的中红外光谱特性

通过熔融淬冷法制备了掺杂0.6%(占基质玻璃的质量分数)Er~(3+):65GeS_2-25Ga_2S_3-10CsI(摩尔比)玻璃。通过不同热处理工艺对玻璃样品进行微晶化处理获得了硫卤微晶玻璃。测试了其密度、显微硬度、红外透过光谱、以及中红外荧光光谱。对比研究了基质玻璃与微晶玻璃样品之间性能差异。结果表明:基质玻璃在热处理温度为440℃,热处理时间为14 h后,所获得的微晶玻璃样品的密度和显微硬度明显增加,中远红外透过性能并未有显著的降低,Er~(3+):~4I_(11/2)→~4I_(12/2)跃迁相对应的2.8μm处的中红外荧光光强稍有增强。     

Tm3+掺杂玻璃光纤研究进展

2 μm波段光纤激光可被广泛应用于激光雷达、生物医疗、环境监测以及光谱学等领域,而Tm³⁺掺杂玻璃光纤是2 μm波段光纤激光重要的增益介质。本文从Tm³⁺掺杂玻璃的发光特性出发,介绍了Tm³⁺掺杂玻璃光纤的制备技术,综述了不同玻璃基质材料掺Tm³⁺光纤的研究进展。最后,指出了制备高性能Tm³⁺掺杂玻璃光纤需要解决的关键问题,提出了可能的解决方法,并对Tm³⁺掺杂玻璃光纤发展趋势进行了展望。     

掺铒高增益磷酸盐激光玻璃的研究进展

掺铒磷酸盐激光玻璃具有受激发射截面大、增益系数高和量子效率高等优点,目前已成为通信领域中广泛应用的一种新型光纤放大器材料.本文主要介绍其性能特点、最新研究进展和应用以及工艺改善方法.     

Ce3+ induced broadband enhancement around 2 μm in Tm3+/Ho3+ co-doped tellurite glass

Tellurite glasses doped with Tm³⁺, Ho³⁺ and Ce³⁺ ions were prepared via melt-quenching to realise broadband and fluorescence enhancement in near-infrared (NIR) band. Under the pumping of a commercial 808 nm laser diode (LD), the emission bands at 2.0 μm, 1.85 μm, 1.47 μm, and 705 nm were observed in the Tm³⁺/Ho³⁺ co-doping glass samples, which originated from the transitions of Ho³⁺:⁵I₇→⁵I₈ and Tm³⁺:³F₄→³H₆, ³H₄→³F₄, ³F_2,3 → ³H₆, respectively. The existence of 2.0 μm band fluorescence is due to the energy transfer from the Tm³⁺:³F₄ level to the Ho³⁺:⁵I₇ level. This band overlaps with the 1.85 μm band which forms a broadband fluorescence spectrum in the range of 1600–2200 nm. In glass samples co-doped with Tm³⁺/Ho³⁺ with 0.085 mol% Ho₂O₃ and 1 mol% Tm₂O₃, the full width at half maximum (FWHM) of this broadband spectrum (1600–2200 nm) was as high as ∼370 nm. After introducing 0.6 mol% CeO₂, the emission intensity of broadband fluorescence increased by ∼50%, which was caused by the cross-relaxations between Ce³⁺ and Tm³⁺ ions. The lifetime of fluorescence decay was determined to prove the interactions among the doped rare-earth ions, the radiative parameters such as transition probability, branching ratio and radiative lifetime were calculated from the absorption spectra based on the Judd-Ofelt theory to better understand the observed luminescence phenomena. In addition, X-ray diffraction (XRD) confirmed the amorphous state structure of the synthesised glass samples, while Raman spectrum revealed the different vibrational structural units forming the glass network.     

Ho3+/Yb3+掺杂铋镓酸盐光学玻璃的上转换发光

制备了高折射率Ho3 /Yb3 掺杂铋镓酸盐玻璃,用Brewster原理测量玻璃的折射率为2.296.用倒易法计算Yb3 的发射截面面积为2.109×10-20 cm2.在室温,用974nm激光器激发玻璃样品,观察并记录到强烈的双光子上转换荧光.分析认为:铋镓酸盐玻璃中Yb3 直接敏化Ho3 的上转换发光的激发机理是Yb3 到Ho3 的高效能量传递.上转换过程中红光相对强度较强的原因为:玻璃声子能量特性、最大能量声子密度降低和玻璃绿光区强吸收3方面因素增加了5F5能级上的粒子数布居,使5F5→5I8能级的跃迁几率升高,导致红光强度大于绿光强度.     

基于脉冲喷射技术的硫系玻璃光纤制备方法探索

硫系玻璃光纤因具有独特的红外光学特性,在红外成像、激光传输和传感等诸多领域具有广阔的应用前景。目前,硫系玻璃光纤的拉制方法主要包括双坩埚法和预制棒拉制法。其中,双坩埚法装置复杂,预制棒拉制法需要提前制备高质量的预制棒。此外,这两种方法均要求玻璃具有较高的抗析晶能力,限制了硫系玻璃光纤新材料的开发。本工作创新性地将脉冲喷射技术引入到硫系玻璃光纤制备领域,通过硫系玻璃光纤纤芯的拉制,探索该方法在玻璃光纤制备上的可行性。通过对玻璃熔体施加持续性的脉冲扰动,坩埚底部小孔处能产生连续的射流,并且在下落过程中发生凝固,从而获得玻璃纤芯。采用该方法,成功制备了一种组成为Ge₂₈Sb₁₂Se₆₀的玻璃光纤纤芯。脉冲喷射法具有装置简单、操作容易等优点,通过连续且规律的脉冲和坩埚内外压力差实现硫系玻璃光纤的拉制,与传统依靠重力拉制的方法相比,脉冲喷射法具有更为丰富的调控手段,从而为新型硫系玻璃光纤的制备提供参考。     

Dy3+‐Doped Selenide Chalcogenide Glasses: Influence of Dy3+ Dopant‐Additive and Containment

This work reports on process‐induced impurities in rare‐earth ion: Dy³⁺‐doped selenide chalcogenide glasses, which are significant materials for active photonic devices in the mid‐infrared region. In particular, the effect of contamination from the silica glass ampoule containment used in chalcogenide glass synthesis is studied. Heat‐treating Dy‐foil‐only, and DyCl₃‐only, separately, within evacuated silica glass ampoules gives direct evidence of silica ampoule corrosion by the rare‐earth additives. The presence of [Ga₂Se₃] associated with [Dy] on the silica glass ampoule that has been contact with the chalcogenide glass during glass melting, is reported for the first time. Studies of 0–3000 ppmw Dy³⁺‐doped Ge_16.5As₉Ga₁₀Se_64.5 glasses show that Dy‐foil is better than DyCl₃ as the Dy³⁺ additive in Ge‐As‐Ga‐Se glass in aspects of avoiding bulk crystallization, improving glass surface quality and lowering optical loss. However, some limited Dy/Si/O related contamination is observed on the surfaces of Dy‐foil‐doped chalcogenide glasses, as found for DyCl₃‐doped chalcogenide glasses, reported in our previous work. The surface contamination indicates the production of Dy₂O₃ and/or [≡Si‐O‐Dy=]‐containing particles during chalcogenide glass melting, which are potential light‐scattering centers in chalcogenide bulk glass and heterogeneous nucleation agents for α‐Ga₂Se₃ crystals.     

Tm~(3+)/Yb~(3+)共掺氟氧玻璃的光谱性质

制备了Tm3+/Yb3+共掺杂的20GaF3-15InF3-17CdF2-15ZnF2-10SnF2-3P2O5-(20-x-y)PbF2-xTmF3-yYbF3(x=0.2～2,y=1～4)系列玻璃。室温下,通过其吸收光谱,运用Judd-Ofelt理论计算了样品的强度参量Ωt(t=2,4,6)、自发辐射几率、荧光分支比和荧光寿命等光谱参数。研究发现,增加Tm3+掺入量对Ω2影响不大,Ω4、Ω6的值有增大的趋势。在980nm激发下的荧光光谱中,观察到5个上转换发射峰,其中发光较强的464nm的蓝光是三光子过程,650nm的红光和800nm的红外光是双光子过程,并讨论了其上转换发光机理和Tm3+、Yb3+掺杂浓度对发光强度的影响。     

Near-infrared luminescence enhancement in Yb3+/Ho3+ co-doped bismuth-tellurite glass by tailoring glass network

In this work, the glass network has been tailored by introducing the modifier WO₃ when a Ho³⁺/Yb³⁺ co-doped bismuth-tellurite glass composition was designed. The physical, absorption, emission, structure, and gain characteristics of the glasses with the different contents of WO₃ were investigated comprehensively based on various tests and analytical methods such as absorption spectra, fluorescence spectra, Raman spectra, and J-O theory. The results show that both the optical band gap and the bridge oxygen content are enhanced remarkably while the substitution of TeO₂ by WO₃, accelerating the transition from [TeO₃] to [TeO₄] units. Simultaneously, the value of Ω₆ reached the maximum of 2.26×10^-20 cm² when the WO₃ is equal to 10 mol%, indicating that the Stark splitting of Ho³⁺: ⁵I₇ energy level is the weakest. The optimal FWHM and the gain coefficient are 143.3 nm and 2.22 cm^-1, respectively. Furthermore, a blue shift of the central wavelength in absorption and emission peaks can be observed at the 2 μm band. As mentioned above, the bismuth-tellurite glass prepared is an ideal gain material that can realize a wider spectra span.     

Effect of residual chlorine on fluorescence emission of Dy3+ doped chalcogenide glasses with low gallium content

Chlorine or chlorides are usually used as a dehydrating agent for removing the O-H or S(Se)-H in the preparation of high-purity chalcogenide glasses. However, the residual chlorine in some rare-earth ions doped chalcogenide glasses was found to have a great negative impact on fluorescence emission. In this work, the effect of residual chlorine on the fluorescence emission of Dy³⁺ ions in serial (Ge)GaAsSbS glasses was studied quantitatively, and the reasons were discussed. Cl₂ gas and SbCl₃ were used as the source of chlorine and their residual contents were controlled by the post-distillation process and added content, respectively. The results can give some suggestions for how to eliminate the negative effects of chlorine and improve the glass’ optical gain properties.