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利用商群对称分析法分析了Nd:LuVO4晶体的晶格振动模分类,测量了Nd:LuVO4晶体的红外光谱和拉曼光谱,从测定的谱线中指认了该晶体的振动模,理论与实验符合良好.测量了Nd:LuVO4晶体的热膨胀系数,a向、b向和c向的热膨胀系数分别为 1.7×10-7/K 、1.5×10-7/K和9.1×10-7/K.测量了比热,其值约为0.48J/g·K.测量了热传导率,其值沿<100>方向为6.2W/m·K,沿<001>方向为7.9W/m·K.这些参数显示该晶体是一种热学性能优良的激光晶体. 相似文献
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Nd:LuVO4晶体的生长及其性能研究 总被引:2,自引:0,他引:2
采用提拉(Czochralski)法生长了Nd:LuVO4晶体.利用液相反应法,以V2O5和NH4OH生成NH4VO3,Nd2O3、Lu2O3和HNO3生成Nd(NO3)3和Lu(NO3)3反应制备多晶料;所生长Nd0.01Lu0.99VO4晶体为16×20×21 mm3,质量超过40g.以X射线荧光分析仪测得其生长中各主要元素的分凝系数.其中Nd3+约为0.91,V3+和Lu3+接近1.还测定了其介电常数ε11=27.2,ε33=33.9(30℃,1kHz),以同步辐射X射线白光形貌术观察了其内部质量. 相似文献
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用群论的方法计算了Nd:YbVO4晶体的拉曼活性振动模数目,在室温下测得了其极化拉曼谱线,并指认了在不同几何配置下,各振动模式所对应的频率.同时,测得了室温下晶体的吸收谱,得到了中心波长为808 nm吸收峰的半高宽为12 nm,并在J-O理论的基础上计算了晶体的光学参数,其三个晶场参数分别为Ω2=6.88945×10-20 cm2、Ω4=4.13394×10-20 cm2、Ω6= 4.54503×10-20 cm2,并由此得到4F3/2能级的荧光寿命为178.69 μs,1062 nm处的荧光分支比为48.85;,积分发射截面为2.7867 10-18 cm2.分别在808 nm、940 nm激发下测得晶体室温发射谱,观察到了Nd→Yb以及Nd←Yb间的能量传递现象. 相似文献
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采用Czochralski法生长了透明均匀的Cr:Nd:YCaO(BO3)3晶体,生长的晶体尺寸为φ42.5×50mm,生长参数为提拉速度为0.6mm/h,转速为25r/min.测定了其室温吸收谱.根据Judd-Ofelt理论拟合了Nd3+离子的强度参数Ωλ:Ω2=0.734×10-20,Ω4=6.814×10-20,Ω6=2.476×10-20;并计算了各能级跃迁的自发辐射跃迁几率、辐射寿命、荧光分支比.其中4F3/2能级的寿命τtot=271.64μs,4F3/2→4I9/2的荧光分支比βc=58.01;.并对实验结果进行了讨论. 相似文献
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F. Q. Liu H. R. Xia W. L. Gao D. G. Ran S. Q. Sun Z. C. Ling P. Zhao H. J. Zhang S. R. Zhao J. Y. Wang 《Crystal Research and Technology》2007,42(3):260-265
Polarized absorption spectra of Nd:LuVO4 crystal were measured at room temperature. The optical parameters of π polarization and σ polarization were calculated by Judd‐Ofelt theory. Meanwhile, the phenomenological intensity parameters: Ω2, Ω4, and Ω6 were obtained, then the parameters were used to calculate the luminescence parameters of Nd:LuVO4 crystal, including oscillator strengths, fluorescence branching ratio, radiative lifetime and integrated emission cross‐sections. Experiments of a‐cut and c‐cut Nd:LuVO4 lasers were also performed, and opt‐opt conversion efficiency and slope efficiency were 40.3%, 50.5% for a‐cut and 23.6%, 30.9% for c‐cut, respectively. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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Donggang Ran Hairui Xia Shangqian Sun Fengqin Liu Zongcheng Ling Wenwei Ge Huaijin Zhang Jiyang Wang 《Crystal Research and Technology》2007,42(9):920-925
A Nd‐doped lutetium orthovanadate Nd:LuVO4 crystal has been grown using a modified Czochralski method. The thermal properties of this crystal have been studied by measuring the thermal expansion, specific heat and thermal diffusivity. The thermal expansion coefficients are α11 = 1.7 × 10‐6, α22 = 1.5 × 10‐6 and α33 = 9.1 × 10‐6/K in the temperature range of 298–573 K along the three respective crystallographic axes. The specific heat is almost linear and increases from 0.442 to 0.498 Jg‐1K‐1 in the measured temperature range. The thermal diffusivity is anisotropic and decreases with increasing temperature from 295 to 548 K. At room temperature the calculated thermal conductivities κ11 and κ33 are 7.96 and 9.77 Wm‐1K‐1, respectively. These thermal parameters of Nd:LuVO4 crystal have indicated that it is an excellent candidate laser material. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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以浓度分布差小和退火后光学均匀性好为目的,通过改造温场,分阶段调整生长界面、搅拌速度、提拉速度、温度、时间等工艺参数,改善了Nd:YVO4激光晶体的光学质量和光学均匀性. 相似文献
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Y. Urata K. Akagawa S. Wada H. Tashiro S. J. Suh D. H. Yoon T. Fukuda 《Crystal Research and Technology》1999,34(1):41-45
Thulium-doped gadolinium vanadate (Tm:GdVO4) single crystal has been successfully grown by a modified Czochralski (CZ) technique. Effective distribution coefficient of Tm was determined to be 0.74. Absorption characterization was performed in the 800 nm region and the maximum absorption peak was found at 799 nm for p polarization. Fluorescence spectra for tuning at the maximum absorption were obtained around 1.8-2.0µm region with 100 nm bandwidth. This suggests that a Tm:GdVO4 crystal is expected as a new promising LD pumped solid-state laser in the 2µm region. 相似文献