RE3+( RE= Dy,Tm,Yb):PbF2激光晶体生长与性能研究
文献类型：学位论文
| 作者 | 陈光珠 |
| 学位类别 | 硕士 |
| 答辩日期 | 2014 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 杭寅 |
| 关键词 | 稀土离子，氟化铅，激光晶体，J-O理论，光谱性能 |
| 其他题名 | Study on the growth and performance of rare earth ions doped lead fluoride laser crystals |
| 中文摘要 | 立方结构的氟化铅晶体具有透光范围宽、很低的声子能量等特性，可以采用坩埚下降法生长出大尺寸、高质量的PbF2晶体，因此PbF2晶体将是一种性能优良的中红外激光基质材料。掺Dy3+离子在中红外波段的发光，有利于1.8μm、2.9μm、4.3μm激光输出的实现；2μm波段固态激光器在军事、医疗等方面均有重要应用，因而继续深入研究Tm3+的2μm激光晶体十分必要；在Yb3+掺杂的晶体中浓度猝灭的现象弱于很多其它稀土离子掺杂，已经实现在很高的掺杂浓度下激光输出，因此研RE3+( RE= Dy,Tm,Yb):PbF2激光晶体具有很重要的意义。本文对RE:PbF2激光晶体的生长及性能进行研究，主要包括以下几个方面内容： 1.利用坩埚下降法生长了2% Dy:PbF2、2% Tm,2% Na:PbF2 激光晶体，晶体质量一般，均不同程度出现了开裂，局部透明性较好，在课题组原来研究基础上成功生长了直径为50mm的大尺寸2% Yb, 2% Na:PbF2激光晶体； 2.利用XRD，ICP等方法对三种晶体进行了结构表征和分凝系数的计算；测试了Dy:PbF2不同部位的线膨胀系数和热导率，计算出平均线膨胀系数为36.79x10-6/K，室温下Dy：PbF2晶体热扩散系数为0.52/mm2，热导率为1.06W/m•K； 3.测试并分析了Dy:PbF2紫外、可见区和红外区吸收光谱，根据吸收光谱用J-O理论拟合出光谱的跃迁强度参数，并计算出各能级在电偶极近似模式下的辐射跃迁几率、辐射寿命和荧光分支比； 4.以1100nm的LD泵浦源测试了Dy:PbF2中红外区的荧光光谱，同时根据Dy:PbF2晶体位于2860nm荧光衰减曲线，通过数据拟合计算出激发态6H13/2的荧光寿命为15.19ms； 5.用氙灯做激发源，分别以350nm和384nm为激发波长测试了Dy:PbF2晶体的光致发光光谱，同时发出蓝光(430-480nm)和互补色黄光（570-595nm）。首次计算了Dy:PbF2晶体分别在350nm和384nm为激发波长下的CIE标准色度坐标和色温； 6.研究分析了室温下Tm,Na:PbF2的吸收光谱和荧光光谱，与单掺Tm:PbF2对比发现，当共掺2 mol%的Na离子时，Tm离子位于776nm的吸收峰的吸收系数和吸收截面都增大；在中心波长为1840nm处出现了较宽的强荧光峰，荧光峰跨跃了1700～2100nm，近400nm的峰宽暗示Tm,Na:PbF2有利于可调谐激光的输出，通过数据拟合得到3F4能级的荧光寿命为5.02ms； 7.分析了室温下Yb,Na:PbF2的透过率曲线和吸收光谱与荧光光谱，在900～1050nm范围内均发现了较强的吸收峰，和单掺Yb：PbF2晶体相比，吸收系数明显变强，吸收截面和带宽均变大；在中心波长977nm处出现了较宽的荧光峰，荧光峰跨跃了960～1050nm，通过数据拟合得到了2F5/2能级的荧光寿命为1.612ms。 |
| 英文摘要 | Lead fluoride crystals of cubic structure (β- PbF2),whose transmission range of can be extended to UV ,has the advantages of lower phonon energy, excellent spectral properties and potential application of laser,it will become the potential matrix material of solid state lasers.In addition, PbF2 crystal with large size and high quality can be grown by Bridgman method. Dy3+ doped fluoride crystals,which can emitting light in the infrared wave band, is conducive to realize of 1.8 μ m, 2.9 μ m, 4.3 μ m laser output; 2 μ m band solid-state laser has important application in military, medical and so on, thus further study of Tm3+ in 2 μm laser optical crystal and the development of 2 μm laser is necessary; concentration quenching phenomenon in Yb3+ doped crystals is weaker than in many other rare earth ions doped, it can realize laser output at high doping concentration. So it has very important significance to study the laser crystal of RE3+ (RE= Dy, Tm, Yb) doped PbF2. This thesis studies on the growth and properties of RE: PbF2 laser crystal, mainly include the following contents: 1.The 2%Dy: PbF2 and 2% Tm,2% Na:PbF2 crystals were grown by the Bridgman method,which have varying degrees of cracks, the local good transparency.A large size of diameter 50mm 2% Yb,2% Na: PbF2 laser crystal was growth on the basis of the original study of our group; 2.The structures were characterized and the segregation coefficients were calculated of three kinds of crystal using XRD, ICP and other methods; the average line themal expansion coefficient of the Dy:PbF2 is 36.79x10-6/K, the themal diffusion coefficient and thermal conductivity is 0.52/mm2 and 1.06W/m•K； 3.The absorption spectras of Dy:PbF2 in the visible and infrared regions were tested , the transition intensity parameter of the spectrum and the energy in the electric dipole approximation model of radiative transition probability, radiative lifetimes and branching ratio were calculated using J-O theory. 4.The fluorescence spectra of Dy:PbF2 in the infrared region was tested with the LD pump of 1100nm, while the fluorescence decay curve at the 2860nm of Dy:PbF2 crystal was tested , the fluorescence lifetime of excited states in 6H13/2 is 15.19ms by data fitting,; 5.With Xenon lamp as excitation source and the excitation wavelength of 350nm and 384nm, photoluminescence spectra of Dy:PbF 2 crystal has been measured，then blue light and yellow light are excited.CIE chromaticity coordinates of Dy:PbF2 crystal has been calculated respectively in 350nm and 384nm, which are(0.357, 0.356) and (0.322, 0.346).At a suitable yellow to blue intensity ratio, Dy3+ will emit white light, which is necessary for the development of white light emission and are very useful in high resolution optical display systems. 6.Both of the absorption and fluorescence spectras of Tm,Na:PbF2 at room temperature have been measured.Compared with single doped Tm:PbF2 laser crystal, when Co-doped 2 mol%,Na ion ,both absorption coefficient and absorption cross section of Tm ions at 776nm are increased; a wide strong fluorescence peak ,with center wavelength of 1840nm, acrossed 1700 ~ 2100nm, nearly 400nm width suggested that Tm, Na:PbF2 can be output tunable laser, the fluorescence lifetime of 3F4 level is 5.02ms; 7.The transmission ,absorption and fluorescence spectras of Yb,Na:PbF2 at room temperature have been measured.The transmission and absorption spectrum of Yb,Na:PbF2 at room temperature in the range of 900 ~ 1050nm showed strong absorption peaks, compared with single doped Yb:PbF2 crystals, the absorption coefficient becomes stronger, the absorption cross section and the bandwidth becomes larger;The fluorescence spectra and fluorescence decay curves of Yb,Na:PbF2 at room temperature have been measured, with the center wavelength of 977nm ,the wide fluorescence peak, acrossed 960 ~ 1050nm, through data fitting the fluorescence lifetime of 2F5/2 level is 1.612ms. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16875]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 陈光珠. RE3+( RE= Dy,Tm,Yb):PbF2激光晶体生长与性能研究[D]. 中国科学院上海光学精密机械研究所. 2014. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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