MoP_5O_(14)非晶中Ho~(3+)离子光谱参数的计算

由测量的HoP_5O_(14)非晶的吸收光谱,计算了Ho~(3+)在五磷酸盐非晶中的强度参数Ω_λ,并由此计算了激光能级的振子强度、自发辐射跃迁速率、荧光分支比和积分发射截面。本文还讨论了HoP_5O_(14)作为红外激光材料的可能性。     

ErP_5O_(14)晶体的生长与光谱

引言Er~(3 )已用作固体激光的激活剂或敏化剂,它在紫外、可见光谱区有丰富的强吸收带,在光抽运情况下容易实现激光振荡。Er~(3 )在晶体中有几种波长能够产生激光,其中以1.5μm振荡阈值较低,这一波长激光在光纤介质中传输损耗很低,可用作光纤通信的光源。因此,开展ErP_5O_(14)晶体的光谱和激光性能研究很有意义。过去,我们曾在自己组装的荧光分光光度计上测定了NdP_5O_(14),EuP_5O_(14),TbP_5O_(14)     

Ho~(3+)离子及HoP_5O_(14)晶体的光谱性质

根据HoP_5O_(14)的吸收光谱和荧光光谱,用Judd-Ofelt理论计算了Ho~(3+)的强度参数.并计算了激发能级的辐射跃迁速率、辐射寿命、荧光分支比和积分发射截面等光谱参数.     

TbP5O14非晶基本光谱参数的计算

由测量的TbP_5O_(14)非晶的吸收光谱,拟合计算了TbP_5O_(14)非晶的光谱强度参数Ω(?),并对重要的Tb~(3+)离子的荧光跃迂的振子强度、自发辐射跃迂速率和荧光分支比等基本光谱参数进行了简要的分析和计算。     

NdP_5O_(14)的光谱和能级

本文报导测定水热法生长的激光晶体NdP_5O_(14)和Nd_xLa_(1-x)P_5O_(14)的光谱特性。从所测结果得知,改变Nd_xLa_(1-x)P_5O_(14)晶体中组分x,对峰值位置没有影响。由吸收光谱计算了主要吸收峰的吸收截面和振子强度。红外光谱测试结果表明,我们生长的NdP_5O_(14)晶体中不含有OH和P-OH键。测定了晶体的荧光光谱,在改进实验装置的情况下,测出了荧光强度较弱的4~F_(3/2)→4~I_(13/2)跃迁。根据所测光谱数据,确定了NdP_5O_(14)晶体中Nd~(3 )离子室温实验能级。所得结果与文献报导相符。     

铒离子在钨酸锌晶体中的光谱性质

本文测量并分析了ZnWO_4∶Er晶体的吸收光谱、激发光谱和荧光光谱,发现Er~(3+)离子与基质晶格之间存在能量传递效应。用Judd-Ofelt理论计算了Er~(3+)离子的强度参数Ω_λ以及吸收和辐射跃迁的振子强度,并由此计算出激光能级辐射跃迁几率、辐射寿命、积分发射截面及荧光分支比等光谱参数。讨论了ZnWO_4∶Er晶体几个主要通道实现激光输出的可能性。     

用Judd-Ofelt理论计算Nd~(3+)离子在LaMgAl_(11)0_(10)单晶中的光谱参数

本文根据Judd-Ofelt理论,利用LaMgAl_(11)O_(19)单晶中Nd~(3+)离子的7个收光谱支项和~4F_(3/2)→~4I_(9/2,11/2,13/2)的三个荧光带计算了谱线强度,振强度,强度参量Ω_(2,4,6),电偶极子跃迁几率及荧光分支比等光谱参数。     

Nd~(3+)在YAP晶体中的光谱参数

根据Judd-Ofelt理论,计算了Nd:YAP晶体的实验和理论谱线强度、强度参数Ω_λ(λ=2,4,6)、辐射跃迁几率、辐射寿命和荧光分支比。     

新型激光晶体Gd_3(In,Ga)_2Ga_3O_(12):Cr~(3+)的发光

本文首次报道了一种用熔盐法生长的新型终端声子激光晶体Gd_3(In,Ga)_2Ga_2O_(12):Cr~(3+)的光谱特性。根据室温吸收谱及荧光谱确定了该晶体的若干主要光谱参数。     

用Nd~(3+):YAG倍频激光泵浦甲酚紫高氯酸盐染料激光器的研究

对新型国产激光染料甲酚紫高氯酸盐(C_(16)H_(12)ClN_3O_5)的光谱特性和激光输出特性进行了研究。测得甲酚紫高氯酸盐的吸收特性和荧光特性,进而测得甲酚紫溶于乙醇后在Nd~(3+):YAG倍频激光泵浦下得到λ=6570nm附近较强激光输出,激光光谱在645～669nm,带宽24nm。染料激光的转换效率达20%。染料激化的脉宽小于泵浦光激光脉宽。同时测得染料激光的输出强度对染料浓度的依赖关系,找到激光输出最强时的最佳染料浓度,以及转换效率对泵浦     

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     

掺铒镉铝硅酸盐玻璃的Judd-Ofelt理论分析与光谱特性

以掺杂光子晶体光纤为介质的光纤激光器一直受到科研工作者的广泛关注,应用于光子晶体光纤纤芯的掺稀土元素玻璃的制备成为研制掺杂光子晶体光纤的关键问题。利用高温熔融工艺制备掺铒镉铝重金属硅酸盐玻璃样品,测试了其吸收光谱、荧光光谱和荧光寿命。采用Judd-Ofelt理论,计算了样品的强度参数t（t=2,4,6）以及铒离子的理论和实验振子强度、自发辐射几率、荧光分支比和荧光辐射寿命等参数,利用测得的荧光光谱计算了铒离子能级4I13/24I15/2的受激发射截面及荧光半高宽。结果表明:掺铒镉铝重金属硅酸盐玻璃具有较大的受激发射截面和比较宽的荧光半高宽,量子效率较高,达92.6%,与相关文献中的铒掺杂玻璃相比,具有良好的激光激发性能,有望在研制掺杂光子晶体光纤中得到应用。     

A theoretical study of a Ti-diffused Er:LiNbO3 waveguidelaser

A detailed theoretical procedure of determining the mode sizes of fundamental mode field distribution in a coaxially pumped Ti-diffused Er:LiNbO₃ waveguide laser has been described. The mode sizes, effective refractive indexes, effective pump area, and coupling efficiency as a function of the initial Ti stripe width W were numerically calculated for the waveguide with 95- and 100-nm initial Ti stripe thicknesses, respectively. The results indicated that the threshold pump power is severely affected by the stripe width, while slope efficiency is hardly changed as W; both show little difference between 95- and 100-nm stripe thickness. In addition, the stimulated emission cross section of Er³⁺ in Er:LiNbO₃ channel waveguide versus the wavelength were calculated directly from its fluorescence spectra using the β-τ method. Subsequently, threshold pump power and slope efficiency were evaluated     

Erbium spectroscopy and 1.5-/spl mu/m emission in KGd(WO/sub 4/)/sub 2/: Er,Yb single crystals

We grew good-optical-quality KGd(WO/sub 4/)/sub 2/ single crystals doped with erbium and ytterbium ions at several concentrations of dopants using the top-seeded-solution growth slow-cooling method (TSSG). We performed the spectroscopic characterization of this material related to the 1.5-mm infrared emission of erbium which is interesting for laser applications. To do this, we carried out polarized optical absorption at room temperature (RT) and at low temperature (6 K) and performed luminescence studies of the emission and lifetime. We obtained the 1.5-mm emission of erbium after selective laser pump excitation of the ytterbium ion and energy transfer between the two ions. The maximum emission cross section for 1.5 mm was about 2.56/spl times/10/sup -20/ cm/sup 2/ for the polarization of light with the electric field parallel to the N/sub m/ principal optical direction. This value was higher than for other erbium-doped materials with application in solid-state lasers such as LiYF/sub 4/:Er(YLF:Er), Y/sub 3/Al/sub 5/O/sub 12/:Er(YAG:Er), YAlO/sub 3/:Er, and Al/sub 2/O/sub 3/:Er.     

Fluorescence EXAFS analysis of ErP grown on InP by organometallic vapor phase epitaxy using a new organometal Er(EtCp)3

We have investigated local structures of ErP grown by organometallic vapor phase epitaxy Er source: tris(ethylcyclopentadienyl)erbium (Er(EtCp)₃ by extended X-ray absorption fine structure (EXAFS) measurement. The EXAFS analysis revealed that NaCl-type ErP and Er–O(–C) compounds coexisted in the case of ErP growth by using Er(EtCp)₃. The NaCl-type ErP was preferentially formed on InP(1 1 1)A compared with InP(0 0 1) and InP(1 1 1)B. It is considered that formation of unexpected Er–O(–C) compounds is due to low but significant concentration of residual O and/or C in Er(EtCp)₃.     

发光晶体Na_5Er（WO_4）_4的光谱性质和Er~（3＋）的光谱参数计算

制备了Ｎａ５Ｅｒ（ＷＯ４）４的粉末和单晶，测定了晶格参数、单晶吸收光谱，激发和发光光谱。计算了吸收谱线振子强度，根据Ｊｕｄｄ－Ｏｆｅｌｔ理论拟合出Ｅｒ３＋发光光谱的三个强度参数Ω２，４，６＝１．７４，１．４６，０．５１×１０－２ｃｍ２，计算了自发辐射电偶和磁偶跃迁振子强度和跃迁几率、辐射寿命、荧光分支比和积分发射截面等光谱参数，讨论了Ｅｒ３＋发光谱线出激光的可能性。     

Spectroscopic Properties and Laser Performance of Er3+ and Yb3+ Co-Doped GdAl3(BO3)4 Crystal

An Er:Yb:GdAl₃(BO₃)₄ crystal was grown and room-temperature polarized absorption, emission, and gain spectra were investigated. Fluorescence decay curves of Er³⁺ at 1530 nm and Yb³⁺ at 1040 nm in the crystal were measured. Efficient laser operation of Er:Yb:GdAl₃(BO₃)₄ crystal at 1.5-1.6 mum was realized. Quasi-continuous-wave output powers of 1.8 W with slope efficiency of 19% and 0.78 W with slope efficiency of 14% were achieved in diode-pumped c-cut and c-cut and a-cut crystals, respectively. The output spectrum and polarization of Er:Yb:GdAl₃(BO₃)₄ laser were also investigated.     

铒掺杂钠铝硅玻璃成分对其光谱性质的影响

研究了Na2O含量对Na2O-Al2O3-SiO2(NAS)玻璃的光谱性质的影响。利用Judd-Ofelt(J-O)理论和吸收光谱计算了Er^3 掺杂的铝硅酸盐玻璃的Ωt参数、自发辐射几率和自发辐射寿命，分析了Ωt参数与Na2O含量的关系以及与吸收截面，Er^3 离子^4I13 2能级的自发辐射几率和荧光半峰全宽(FWHM)等性质的关系。随Na2O含量的增加．J-O参数Ωt(t=2，4，6)减小，Er^3 离子1533nm的吸收截面和荧光半峰全宽．Er^3 离子^4I13 2能级的自发辐射几率也减小，而Er^3 离子的荧光寿命增大。