共查询到18条相似文献,搜索用时 109 毫秒
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Yb:YAP晶体的光谱性能研究 总被引:1,自引:0,他引:1
应用中频感应加热提拉法生长出掺杂浓度为10;原子分数的Yb:YAP晶体,研究了室温下Yb:YAP晶体的吸收和发射光谱特性以及荧光寿命.Yb:YAP晶体在959nm处有最强吸收,吸收截面约为1.51 × 10-20 cm2,在1040nm处的发射截面为0.6 ×10-cm2,激光上能级荧光寿命为1.2 ms,此处自吸收较小,是实现激光输出的候选波长.研究了氧气退火对Yb:YAP晶体的光谱性能的影响.Yb:YAP晶体轴向效应明显,b轴将是作为激光输出的首选方向.比较了Yb:YAP晶体和Yb:YAG晶体的光谱性能参数. 相似文献
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采用提拉法生长yb3+掺杂浓度为0.5at;高质量的Yb∶Y3 Al5O12(Yb∶YAG)晶体.对晶体的结晶质量、分凝系数和光谱和激光性能进行了表征.结果表明:所生长的晶体结晶质量较好,在空气中退火后晶体吸收系数略有增加,晶体中自吸收效应的影响很小,具有宽的发射带.Yb∶YAG晶体和Yb∶YAG/YAG复合晶体分别在抽运功率为7.1W和6.15W的LD抽运下,获得2.19W和1.354 W的连续激光输出,斜率效率分别为34.58;和25.9;. 相似文献
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Yb:GdVO4晶体的光谱及激光损伤阈值 总被引:3,自引:2,他引:1
采用提拉法(Czochralski)生长出优质的GdVO4和Yb:GdVO4晶体,其中纯GdVO4晶体具有较高的透过率,可达81;.晶体在室温下的偏振吸收光谱与非偏振荧光光谱表明,Yb:GdVO4晶体是一种具有较大的吸收半峰宽和荧光半峰宽的激光晶体,分别为44~52nm和40~46nm;随着掺杂浓度增大,π偏振吸收系数呈现饱和趋势,且荧光峰的位置出现了红移.此外,还采用Nd:YAG激光器测试了晶体的激光损伤阈值,实验表明,随着Yb3+掺杂浓度从4.1at;增加到22.9at;,激光损伤阈值也相应地从19.9×109W/cm2逐渐减小到2.79×109W/cm2. 相似文献
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Yb:YAG闪烁晶体的UV发光特性 总被引:1,自引:0,他引:1
通过对不同掺杂浓度Yb:YAG晶体的透过光谱、激发光谱、发射光谱和衰减时间的测量,研究了Yb:YAG晶体的UV发光特性和发光机制.Yb:YAG晶体在紫外波段具有宽的激发带和发射带.最强的发射峰位于320~350nm波长范围,此即为Yb:YAG晶体的闪烁发光峰;次强的发射峰位于500nm附近.Yb:YAG晶体的UV发光衰减时间小于50ns.Yb:YAG晶体的UV发光行为是电子从Yb3+离子的4f壳层向配体O2-的满壳层的分子轨道迁移的结果,属于电荷迁移(CT)发光. 相似文献
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利用提拉法生长了Si4+共掺杂Yb∶YAG单晶,该晶体属于立方晶系,Oh10-Ia3d空间群。掺杂的Si4+没有改变YAG的晶体结构,但是影响了发光离子的价态。吸收光谱表明Si4+的引入使得Yb2+含量增多,这是由于Si4+引入了过量的电荷,为满足电价平衡,Yb3+转换为Yb2+。Yb2+的出现降低了Yb∶YAG的发光强度。稳态X射线激发发射光谱结果表明Si4+共掺杂Yb∶YAG晶体的发光强度是Yb∶YAG的63%,γ射线激发下的光产额降至原来的40%。此外,由于原料中含有多种Yb的同位素,Yb∶YAG除了可以被X射线、γ射线激发出荧光外,还可以与中子发生核反应产生带电粒子,进而引起次级反应产生荧光。荧光的产生仍然由Yb3+决定,因此,Si4+掺入也降低了中子探测灵敏度。 相似文献
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Growth and properties of Tm: YAG crystals 总被引:1,自引:0,他引:1
Pingxin Song Zhiwei Zhao Xiaodong Xu Benxue Jang Peizhen Deng Jun Xu 《Journal of Crystal Growth》2004,270(3-4):433-437
The high optical quality Tm: YAG single crystals with dopant concentrations of 2, 4, 8 at % Tm3+ ions have been grown by the Czochralski (CZ) method .The segregation coefficients of Tm3+ ions in CZ-grown 2, 4, 8 at % doped Tm: YAG crystals determined by ICP-AES method are equal to 0.93, 1.04, 1.10, respectively. The absorption spectra in the range of 190–900 nm and the IR absorption spectra in the range of 1000–4500 cm−1 of the Tm: YAG crystals were also measured at room temperature. The results indicate that Tm: YAG is favorable for laser diode-pumped system, and air annealing can improve the quality of the Tm: YAG crystal. 相似文献
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为了满足高功率白光发光二极管(Light-Emitting Diode,LED)对荧光体的高性能要求,对白光LED用Cex Gd:YAG单晶荧光材料的制备和光学、电学、热学特性进行了研究.采用提拉法生长了CexGd:YAG(x=0.02,0.04,0.06,0.08)单晶,并借助于X射线衍射(XRD)、吸收光谱、发射光谱等对晶体的光谱特性进行了表征,同时也测试分析了相对荧光强度随温度的变化关系、基于不同Ce3+浓度Cex Gd:YAG单晶的白光LED性能参数.结果表明Cex Gd:YAG单晶在450 nm的蓝光激发下,产生一个500~650 nm的宽峰发射,在100℃高温下,其荧光光强比商用荧光体粉末高出10;.当Ce3+浓度为6;时,采用Cex Gd:YAG单晶荧光片的白光LED光效高达153 lm/W,是Ce:YAG和树脂荧光材料白光LED的两倍多.Cex Gd:YAG单晶荧光片,具有更高更稳定的荧光光强,制作的白光LED光效有明显提升,有望成为新型的商用荧光体. 相似文献
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Zhong De‐gao Teng Bing Cao Li‐feng Chao Wang He Lin‐xiang Li Jian‐hong Zhang Shi‐ming Li Yu‐yi 《Crystal Research and Technology》2013,48(6):369-373
Yb: LuPO4 crystals with the size up to 6×2×0.5mm3 were grown by the flux growth process using lead pyrophosphate Pb2P2O7 as the high‐temperature solvent. The crystal structure of Yb: LuPO4 crystals at room temperature was refined by using single crystal X‐ray diffraction data. Crystal structure analysis showed that Yb: LuPO4 crystals possessed the tetragonal xenotime structure. The polarized absorption spectra of Yb: LuPO4 were tested at room temperature. The results showed that the absorption spectral region of Yb: LuPO4 crystal was well matched for pumping with readily available diode lasers. 相似文献
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Guangjun Zhao Hongjun Li Jiang Zhu Mingyin Jie Xiaoming He Jun Xu 《Journal of Crystal Growth》2005,280(3-4):483-489
The dark-brown colored 5 at% Yb-doped YAlO3 (Yb:YAP) single crystal was grown successfully by temperature gradient technique (TGT) for the first time. The TGT-grown Yb:YAP crystal with the perovskite structure and excellent crystallization perfection were confirmed by the X-ray diffractions techniques. The dark-brown color of TGT-Yb:YAP crystal turned into the colorless after annealing in the air at 1200 °C for 10 h. The absorption spectra, LD-excited infrared emission and X-ray excited luminescence spectra of the air-annealed Yb:YAP single crystal were investigated at the room temperature. The results indicate that the TGT-Yb:YAP single crystals can be used for the laser and scintillation applications. 相似文献
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A series of In:Yb:Er:LiNbO3 crystals have been grown. The UV‐Vis absorption spectra and Infrared (IR) transmission spectra were measured and discussed in terms of the spectroscopic characterizations and the defect structure of the In:Yb:Er:LiNbO3 crystals. The optical damage resistance was characterized by the transmitted beam pattern distortion method. The optical damage resistance of In (3.0mol %):Yb:Er:LiNbO3 crystal is one order of magnitude higher than that of other crystal. The dependence of the optical damage resistance on the defect structure was studied. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献