Ti:MgAl2O4激光晶体的提拉法生长及性能表征

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	Ti:MgAl2O4激光晶体的提拉法生长及性能表征
其他题名	Growth and characterization of Ti:MgAl2O4 laser crystal by Czochralski method
	孙贵花; 张庆礼; 罗建乔; 孙敦陆; 谷长江; 郑丽丽; 韩松; 李为民
	2020
发表期刊	物理学报
ISSN	1000-3290
摘要	通过构建合适的温度梯度,优化转速、生长速度等工艺条件,采用提拉法晶体生长技术,首次成功地生长出了Ti离子掺杂的Ti:Mg Al2O4晶体,晶体尺寸为φ30 mm×70 mm,X射线摇摆曲线表明该晶体的结晶质量良好.对晶体的拉曼振动峰进行了指认.测量了Ti:Mg Al2O4晶体退火前后的透过和荧光发射光谱,结合电子自旋共振(ESR)谱图分析了晶体中Ti离子的价态.室温下Ti:Mg Al2O4晶体在480 nm附近有个宽带发射峰,其荧光寿命为14μs,是Ti:Al2O3、Ti:Be Al2O4晶体的4-5倍,长的荧光寿命有利于储能;发射截面为2×10^–20 cm^2,较大的发射截面利于实现激光输出.因此,Ti:Mg Al2O4晶体是潜在的能够实现宽带可调谐蓝光激光输出的晶体材料.
其他摘要	The melting point of Ti:MgAl2O4 crystal is as high as 2130°C,it is a challenge to obtain a large-sized and high-quality laser crystal.By optimizing the crystal growth process,Ti:MgAl2O4 crystal with a size of 30 mm×70 mm is successfully grown by the Czochralski method under the condition of weak reducing atmosphere.The X-ray diffraction pattern is studied,and the x-ray rocking curve indicates that the grown crystal has a high crystalline quality in terms of the lower full width at half maximum(FWHM)intensity,which provides a material basis for the next laser output experiment.In a range of 100–1000 cm^–1,there are four Raman vibration peaks located at 312,410,675 cm^–1 and 771 cm^–1 respectively.The grown crystal has an absorption cutoff range of 250–318 nm and two wide absorption bands of 395–495 nm and 550–1100 nm.Excited by271 nm,the grown crystal shows a strong broadband emission ina range of 340–650 nm with a peak centered at480 nm.After annealing in hydrogen atmosphere,shape of the transmittance spectrum and emission spectrum are both unchanged,but the fluorescent emission intensity is significantly reduced.After annealing in air atmosphere,the original two absorption bands disappear while none of the characteristics of fluorescence emission in a 340–650 nm range changes significantly.In addition,a new fluorescence emission peak near725 nm is observed.Combining with the ESR spectrum,what we canconfirm is that the Ti:MgAl2O4 as-grown crystal contains Ti^3+and Ti4+ions,and no ESR signal of Ti^3+is observed after annealing in air atmosphere.Moreover,excitationspectrum is also recorded.The fluorescence lifetime is 14μs at room temperature,which is4–5 times that of Ti:Al2 O3 crystal and Ti:BeAl2O4 crystal.Furthermore,the emission cross section of the grown Ti:MgAl2O4 crystal is calculated from the Füchtbauer-Ladenburg(F-L)formula and its value is 2×10^–20 cm^2,large emission cross section which is beneficial for realizing laser oscillation.All the above results show that the Ti:MgAl2O4 crystal is a potential crystal material for realizing broadband tunable blue laser output.
关键词	提拉法晶体生长 Ti:MgAl2O4晶体蓝光发射
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:6705835
引用统计
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/98676
专题	中国科学院合肥物质科学研究院
作者单位	中国科学院安徽光学精密机械研究所
推荐引用方式 GB/T 7714	孙贵花,张庆礼,罗建乔,等. Ti:MgAl2O4激光晶体的提拉法生长及性能表征[J]. 物理学报,2020,069.
APA	孙贵花.,张庆礼.,罗建乔.,孙敦陆.,谷长江.,...&李为民.(2020).Ti:MgAl2O4激光晶体的提拉法生长及性能表征.物理学报,069.
MLA	孙贵花,et al."Ti:MgAl2O4激光晶体的提拉法生长及性能表征".物理学报 069(2020).