The laser crystal Nd∶GGG was grown by Cz method. The optimum processing parameter is that the pulling rate is 2～4 mm·h-1, the rotation rate is 20～40 r·min-1 and the cooling rate is 20 ℃. The absorption a...The laser crystal Nd∶GGG was grown by Cz method. The optimum processing parameter is that the pulling rate is 2～4 mm·h-1, the rotation rate is 20～40 r·min-1 and the cooling rate is 20 ℃. The absorption and fluorescence spectra of Nd∶GGG were measured. The main absorption peak of Nd∶GGG is at 808 nm and the fluorescence emission peak is at 9430 cm-1, corresponding to 4F3/2-4I11/2 emission band of Nd3+ ions.展开更多
Nd∶GGG ultrafine polycrystalline powders for transparent ceramics precursor powder were synthesized by sol-gel method, and sol-gel transformation mechanics was discussed. Nd∶GGG polycrystalline material was analyzed...Nd∶GGG ultrafine polycrystalline powders for transparent ceramics precursor powder were synthesized by sol-gel method, and sol-gel transformation mechanics was discussed. Nd∶GGG polycrystalline material was analyzed by XRD, SEM and fluorescence spectrum. XRD analysis shows that Nd∶GGG polycrystalline phase is formed at 1000 ℃, and the grain size increases with rising sintering temperature by SEM, and the particle size is about 100 nm. They are used as transparent ceramics precursor powder. Fluorescence spectrum test shows that the strongest fluorescence emission peak is 1061.45 nm for the Nd∶GGG polycrystalline precursor powder, which is the fluorescence-emission of Nd 3+ 4F_ 3/2—4I_ 11/2.展开更多
文摘The laser crystal Nd∶GGG was grown by Cz method. The optimum processing parameter is that the pulling rate is 2～4 mm·h-1, the rotation rate is 20～40 r·min-1 and the cooling rate is 20 ℃. The absorption and fluorescence spectra of Nd∶GGG were measured. The main absorption peak of Nd∶GGG is at 808 nm and the fluorescence emission peak is at 9430 cm-1, corresponding to 4F3/2-4I11/2 emission band of Nd3+ ions.
文摘Nd∶GGG ultrafine polycrystalline powders for transparent ceramics precursor powder were synthesized by sol-gel method, and sol-gel transformation mechanics was discussed. Nd∶GGG polycrystalline material was analyzed by XRD, SEM and fluorescence spectrum. XRD analysis shows that Nd∶GGG polycrystalline phase is formed at 1000 ℃, and the grain size increases with rising sintering temperature by SEM, and the particle size is about 100 nm. They are used as transparent ceramics precursor powder. Fluorescence spectrum test shows that the strongest fluorescence emission peak is 1061.45 nm for the Nd∶GGG polycrystalline precursor powder, which is the fluorescence-emission of Nd 3+ 4F_ 3/2—4I_ 11/2.
文摘由于Nd3+离子半径0.112nm和Y3+离子半径0.101nm相差10.9%,使得Nd3+离子非常难于进入YAG晶体中。我们用温度梯度法生长了大尺寸高浓度(2.8 at%)的Nd:YAG晶体,同时与用提拉法Nd:GGG晶体进行了比较。分析了高浓度掺杂Nd:GGG和Nd:YAG晶体浓度猝灭问题。研究了不同浓度掺杂的猝灭效应。在同样的掺杂浓度下,我们发现它们的猝灭程度不同,其原因是两种晶体中ΔE(m is-)m和ΔE(m i s+)m不同。
