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研究了γ-辐照前后纯Y2SiO5和Eu3+掺杂的Y2SiO5晶体吸收光谱的变化,辐照后,未退火和氢气退火的纯Y2SiO5晶体在260~270 nm和320 nm波段产生了附加吸收峰,分别是由F心和O-心的吸收引起的;经过空气退火的纯YSO晶体中,由于消除了氧空位,因此辐照后没有出现色心吸收峰。在Eu3+∶Y2SiO5晶体中,不但有相同的F心和O-心吸收峰,而且还有Eu2+离子在300 nm和390 nm的吸收峰。随着辐照剂量的增加,色心附加吸收峰增强。空气退火能减少Eu3+∶Y2SiO5晶体中的色心,而氢气退火能增加色心。 相似文献
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采用温度梯度法生长了熔体掺杂Ce浓度为1at%的YAlO3晶体,对于其吸收光谱、荧光光谱和x射线激发发射谱进行了表征分析.根据吸收光谱提出了一个色心模型,从而成功的解释了为什么刚生长出的晶体为粉红色,而分别经氢气和空气在1400℃退火后均能变为无色的现象和退火以后吸收光谱发生的显著变化.温度梯度法生长的Ce:YAP在330nm处存在着一定程度的自吸收和自激发.光致激发发射谱的发射主峰在368nm,而x射线激发发射谱的主发射峰红移至391nm,这表明在x射线激发下,晶体对发射光的自吸收将会减少.另外在x射线激发发射谱上,经H2退火和空气退火后的样品其发射强度比未退火的晶体要强. 相似文献
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Judd--Ofelt analysis of spectra and experimental evaluation of laser performance of Tm3+ doped Lu2SiO5 crystal 下载免费PDF全文
This paper reports that the Tm^3+:Lu2SiO5 (Tm:LSO) crystal is grown by Czochralski technique. The roomtemperature absorption spectra of Tm:LSO crystal are measured on a b-cut sample with 4 at.% thulium. According to the obtained Judd-Ofelt intensity parameters Ω2=9.3155×10^-20 cm^2, Ω4=8.4103×10^-20 cm^2, Ω6=1.5908×10^-20 cm^2, the fluorescence lifetime is calculated to be 2.03 ms for ^3F4 → ^3H6 transition, and the integrated emission cross section is 5.81×10^-18 cm^2. Room-temperature laser action near 2μm under diode pumping is experimentally evaluated in Tm:LSO. An optical-optical conversion efficiency of 9.1% and a slope efficiency of 16.2% are obtained with continuouswave maximum output power of 0.67 W. The emission wavelengths of Tm:LSO laser are centred around 2.06μm with spectral bandwidth of -13.6 nm. 相似文献
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Diode-end-pumped continuous-wave(CW) Tm:YAP and Tm:YLF slab lasers are demonstrated. The a-cut Tm:YAP and Tm:YLF slabs with doping concentrations of 4 at.-% and 3.5 at.-%,respectively,are pumped by fast-axis collimated laser diodes at room temperature. The maximum CW output powers of 72 and 50.2 W are obtained from Tm:YAP and Tm:YLF,respectively,while the pump power is 220 W,corresponding to the slope efficiencies of 37.9% and 26.6%,respectively. 相似文献
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<正>YAG:Ce crystal with a diameter of 110 mm is successfully grown by the temperature gradient technique (TGT).The effects of annealing on the luminescence efficiency of YAG:Ce crystal are investigated,and the optimal annealing temperature and atmosphere are obtained.The mechanism of variation behavior of the luminescence efficiency of YAG:Ce under different annealing conditions is discussed and some details on the luminescence associated with color centers are analyzed. 相似文献
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<正>We report the luminescence properties and decay profiles of Ce:YAlO_3,Mn:YAlO_3,and Ce,Mn:YAlO_3 crystals grown by Czochralski method.The spectroscopic properties show that both Mn~(2+) ions and Mn~(4+) ions exist in Mn:YAlO_3 and Ce,Mn:YAlO_3 crystals.The Mn~(2+) ions have a broad emission band of 60 nm in Mn-doped YAlO_3 crystal at 530 nm.The luminescence spectra also indicate that there is significant energy transfer between Ce~(3+) and Mn~(4+) in Ce,Mn:YAlO_3 crystal.Because of the energy transfer,the first decay component in Ce,Mn:YAlO_3 decreases from 24.5 to 10.8 ns,which is much faster than that of Ce:YAlO_3. 相似文献
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