中国激光, 2005, 32 (7): 973, 网络出版: 2006-06-01  

钛宝石中子辐照色心的研究

Investigations of Neutron-Induced Color Centers in Ti-Doped Sapphire Crystals
作者单位
1 宁波大学工学院,浙江 宁波315211
2 中国科学院上海光学精密机械研究所,上海 201800
摘要
研究了中子辐照下钛宝石单晶体缺陷的形成及光学性能的变化。对温度梯度法(TGT)生长的钛宝石晶体进行中子辐照,中子能量为1.5 MeV,剂量为4.32×1016 neutrons/cm2。辐照后194 nm吸收峰强度增加,268 nm吸收峰强度则降低。荧光谱检测中发现辐照使得420 nm荧光峰强度明显降低,荧光峰位置也蓝移至414 nm处。分析表明辐照使得钛宝石晶体内形成F+缺陷,同时Ti4+离子则转化成Ti3+离子。辐照后的钛宝石在247 ℃处有热释光TL出现,通过初始上升法计算出其陷阱深度为0.63 eV。该热释光的产生与辐照形成的色心有关,但由于钛离子的猝灭效应使得钛宝石的热释光强度较低。
Abstract
Neutron-irradiation induced optical properties changes and defects formation in Ti-doped sapphire crystals were studied. Temperature gradient technique (TGT) grown Ti-doped sapphire crystals were irradiated by 1.5 MeV neutrons with a dose of 4.32×1016 neutrons/cm2. Absorption, emission and excitation spectra were presented. The 194-nm absorption band intensity enhanced and the 268-nm band weakened after irradiation. And the 420-nm luminescence band weakened and blue shifted to 414-nm. The results indicated that F+-type centers formed and the valence state of titanium switched from quadrivalent to trivalent during irradiation. Thermoluminescence (TL) was observed at 247℃ and assigned to irradiation-induced color centers. The thermoluminescence trap depth is 0.63 eV calculated with initial elevation method, and the lower thermoluminescence intensity is ascribed to the quenching effect of Ti ions.
参考文献

[1] . F. Moulton. Spectroscopic and laser characteristics of Ti∶Al2O3[J]. J. Opt. Soc. Am. B, 1986, 3(1): 125-133.

[2] W. Koechnerr. Solid-State Laser Engineering [M]. Beijing: Science Press, 2002. 67~70
W. 克希耐尔. 固体激光工程[M]. 北京:科学出版社, 2002. 67~70

[3] . Stauss, Roshan L. Aggarwal et al.. Crystal growth, spectroscopy, and laser characteristics of Ti∶Al2O3[J]. IEEE J. Quantun Electron., 1988, 24(6): 995-1002.

[4] . L. Aggarwal, A. Sanchez, R. E. Fahey et al.. Magnetic and optical measurements on Ti∶Al2O3 crystals for laser applications: concentration and absorption cross section of Ti3+ ions[J]. Appl. Phys. Lett., 1996, 48(20): 1345-1347.

[5] . Powell, George E. Venikouas, Lin Xi et al.. Thermal effects on the optical spectra of Al2O3∶Ti3+[J]. J. Chem. Phys., 1986, 84(2): 662-665.

[6] Cheng Guanghua, Yu Lianjun, Wang Yishan et al.. Experimental study of all-solid second harmonic and fourth harmonic generation in Ti∶sapphire laser [J]. Acta Optica Sinica, 2003, 23(3):330~334
程光华,于连君,王屹山 等. 高效全固化紫外四倍频激光器的研究[J]. 光学学报, 2003, 23(3):330~334

[7] . . Investigation on the origin of the blue emission in titanium doped sapphire: Is F+ color center the blue emission center[J]. Appl. Phys. Lett., 1995, 67(3): 317-319.

[8] . W. Levy. Color centers and radiation-induced defects in Al2O3[J]. Phys. Rev., 1961, 123(4): 1226-1233.

[9] . D. Evans, M. Stapelbroek. Optical properties of the F+ center in crystalline Al2O3[J]. Phys. Rev. B, 1978, 18(12): 7089-7098.

[10] Fang Peiying, Li Shenghua. Color centers in single crystal α-Al2O3 [J]. Chinese J. Lasers, 1990, 17(8):487~490
方佩莹,李胜华. α-Al2O3晶体的色心[J]. 中国激光, 1990, 17(8):487~490

[11] Jiang Chengyong, Zhou Guoqing, Xu Jun et al.. Effect of irradiation on Ti-doped sapphire by excimer laser [J]. Chinese J. Lasers, 2004, 31(6):669~672
蒋成勇,周国清,徐军 等. 准分子激光对钛宝石辐照作用的研究[J]. 中国激光, 2004, 31(6):669~672

[12] S. W. S. McKeever. Cai Gangang, Wu Fang, Wang Suoting (trans.). Thermoluminescence of Solid[M]. Beijing: Atomic Energy Press, 1993. 83~88
S. W. S. McKeever 著,蔡干钢,吴方,王所亭 译. 固体热释光[M]. 北京:原子能出版社, 1993. 83~88

[13] Jiang Chengyong. Investigations of laser, γ rays and neutrons irradiation on high-temperature oxide crystals (Doctor′s Degree Paper) [D]. Shanghai: Shanghai Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, 2004. 71~77
蒋成勇. 激光、γ射线及中子对高温氧化物晶体辐照效应的研究(博士论文)[D]. 上海:中国科学院上海光学精密机械研究所, 2004. 71~77

蒋成勇, 周国清, 徐军. 钛宝石中子辐照色心的研究[J]. 中国激光, 2005, 32(7): 973. 蒋成勇, 周国清, 徐军. Investigations of Neutron-Induced Color Centers in Ti-Doped Sapphire Crystals[J]. Chinese Journal of Lasers, 2005, 32(7): 973.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!