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采用熔融法熔制具有金色星点的微晶玻璃,制备过程无需热处理.利用DSC-TG、XRD、SEM、EDS、TEM、BSE、FTIR和热膨胀研究该微晶玻璃配合料的高温熔制过程和不同熔制温度、保温时间对微晶玻璃晶体含量、显微结构和性能的影响.研究表明:配合料在850℃生成钙铝黄长石晶体并在1010℃逐渐转变为辉石,配合料在1200℃时大量熔化,仅含有熔点较高的正方铬铁矿石,随着温度的升高,正方铬铁矿溶解,玻璃液中析出绿铬石晶体;晶体含量随着熔制温度的升高而减少,随着保温时间的延长而增加. 相似文献
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采用固相合成法制备了Nd:Y3Al5O12(Nd:YAG)透明激光陶瓷.用V型棱镜法测量了Nd:YAG陶瓷的折射率.用干涉仪测量了陶瓷的光学均匀性.测试了Nd:YAG透明陶瓷的透过光谱、吸收光谱和荧光光谱,在1064 nm的直线透过率达到80%以上,并计算其吸收系数、吸收截面和发射截面.根据Judd-Ofelt理论,拟合出晶体场强度参数Ωt(t=2, 4, 6)为:Ω2=0.32×10-20 cm2, Ω4=2.72×10-20 cm2, Ω6=5.39×10-20 cm2.荧光辐射寿命τrad为248.61 μs,计算的荧光分支比β为:β1=34.613%, β2=52.814%, β3=10.697%, β4=0.621%.并将Nd:YAG陶瓷的吸收光谱、荧光光谱与Nd:YAG单晶进行了对比. 相似文献
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Ytterbium-doped yttrium oxysulfide(Yb:Y_2O_2S)has been synthesized by solid-state reaction with sulfide flux.Diffuse reflection and emission spectra have been measured in order to determine the crystal field splitting of Yb~(3 )ion in the YOS lattice.According to the crystal-field levels probed in the spectra,the crystal field splitting of ~2F_(7/2)manifold of Yb~(3 )ion in YOS is 709 cm~(-1),which is large enough for the quasi-three-level laser operation of Yb~(3 )ion.Emission peak position,width,full-width at half maximum (FWHM),and normalized intensity of Yb:YOS are fitted from its emission spectrum.For comparison, relevant data of 5.4 at.-% Yb:YAG is also provided. 相似文献
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采用中频感应提拉法生长了高质量的Tm:Y2SiO5(Tm:YSO)晶体,测定了晶体的晶格常数和分凝系数.运用劳厄照相法确定了单斜晶系Tm:YSO晶体的三个偏振轴〈010〉,D1和D2,在室温下测量了三个偏振轴方向的吸收光谱、荧光光谱和荧光寿命,计算了晶体吸收峰的吸收线宽和吸收截面.研究发现,相对于其他两个偏振轴方向,D1方向在790nm处出现较强的吸收峰,
关键词:
2SiO5')" href="#">Tm:Y2SiO5
单斜晶系
吸收光谱
荧光光谱 相似文献
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用提拉法生长了掺铬、钕的钆镓石榴石(Cr^4 ,Nd^3 :GGG)自调Q激光品体。报道了室温下的吸收光谱和荧光光谱特性。分析了Cr离子浓度对光谱性质的影响。比较了Cr^4 :GGG,Nd^3 :GGG和(Cr^4 ,Nd^3 ):GGG晶体吸收光谱的关系。测量了(Cr^4 ,Nd^3 ):GGG晶体和Nd^3 :GGG晶体的荧光寿命,它们分别是33μs和250μs。实验表明,(Cr^4 ,Nd^3 ):GGG晶体是一种非常有潜力的自调Q激光晶体,可以实现大功率激光器的小型化和全固态化。 相似文献
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采用提拉法生长了Yb3 掺质浓度为5%原子分数、50%原子分数和100%原子分数的Yb:Y3A l5O12(Yb:YAG)晶体,系统地分析了不同Yb3 掺质浓度晶体的吸收光谱和荧光光谱。从吸收峰和吸收系数可以看出采用940nm LD泵浦三种不同浓度的Yb:YAG晶体都比较合适。随着Yb3 离子掺质浓度的增高,晶体中出现的自吸收现象越为明显。通过对三种不同Yb掺质浓度晶体激光性能参数的计算,得出高掺质浓度Yb:YAG和YbAG晶体是有前景的激光增益介质。 相似文献
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The absorption spectra, fluorescence spectra, and lifetimes of as-grown and annealed Cr,Yb:YAG crystal grown by Czochralski technique have been measured. The broad absorption bands in the visible region increase in intensity and shift to long wavelength after annealing, and the additional absorption around 482 nm may be possibly due to new octahedral Cr4+ center in the crystal, and the increase in the infrared (IR) region is due to the increase of Cra+. The increase of Cr4+ also results in the groud state absorption and the concentration quenching of Ybs+ in Cr,Yb:YAG crystal after annealing, the fluorescence intensity is reduced to 75% and the emission lifetime is shortened from 1.40 to 0.44 ms. 相似文献