308nmXeCl准分子激光泵浦猝灭式可调谐染料激光器研究

描述了获得准分子激光超脉冲的一种方法，理论上扼要地介绍了淬来式染料激光器产生超短脉冲激光的机理。实验上以香豆素４９８染料得到波长为４９６ｎｍ，脉宽１ｎｓ，能量１．１ｍＪ的染料激光。     

罗丹明染料荧光猝灭法测定超痕量辣根过氧化物酶

在HAC-NaAC缓冲液中,辣根过氧化物酶催化H₂O₂氧化KI生成I₂,过量的I-可与I₂结合形成I-₃,而I-₃分别与罗丹明S(RhS), 罗丹明G(Rh6G), 罗丹明B(RhB)和丁基罗丹明B(b-RhB)反应导致四体系在580,580,554和554 nm处的荧光强度降低。在选择条件下,对于RhS,Rh6G,RhB,b-RhB四体系,辣根过氧化物酶的浓度分别在8～6 400,40～4 000,32～3 200,40～6 400 pg·mL-1范围内与其荧光猝灭强度成线性关系,其检出限分别为3.2,3.0,2.4,3.7 pg·mL-1。其中RhS催化体系较好,用于酶联免疫乙肝试剂盒中辣根过氧化物酶活力的测定,结果比较满意。     

可调谐淬灭式染料激光器研究

研究了可调谐淬灭式染料激光器的染料浓度和泵浦能量对淬灭效果的影响，并且研究了它的调谐范围。对于３０８ｎｍＸｅＣｌ准分子激光泵浦淬灭式香豆素４９８染料激光器，得到了一些具体的参数。     

纳米银粒子表面吸附染料分子的荧光增强及荧光猝灭现象

本文通过阴、阳离子型染料分子荧光素钠(FS)及若丹明6G(Rh6G)吸附在银胶体系内纳米银颗粒表面上,首次发现了FS的荧光增强谱及Rh6G的荧光猝灭谱.引起荧光增强及荧光猝灭的因素,除局域场和分子到金属表面能量转移这两个方面外,还与纳米银表面与被吸附分子之间的距离有关.     

等离子体破裂期间电流猝灭特征研究

等离子体破裂会对托卡马克装置的安全运行造成严重威胁.等离子体破裂期间电流猝灭速率与电磁负载的大小及逃逸电流平台的形成都密切相关.本文对HL-2A装置等离子体破裂进行了统计分析,统计选用等离子电流的两个衰减区间90%-10%和80%-20%.分析结果表明:HL-2A装置等离子体破裂有四种不同的电流猝灭波形,两个衰减区间最小电流猝灭时间的参数区分别为2.6 ms和2.2 ms,并且不同衰减区间下平均电流猝灭时间统计分布明显不同.     

自猝灭流光雪崩机制

本文通过对大量SQS实验现象的分析研究,提出SQS的成因是原初饱和雪崩的空间电荷造成阳极丝附近电场的畸变.根据这一假设,对SQS过程做了定量的计算,给出各种不同条件下,计数管输出电荷量与所加高压的关系曲线.计算了SQS转变电压、转变点原初雪崩的电荷量和SQS雪崩的电荷量与气体组分的关系.计算结果和实验结果令人满意地符合.     

DFDL产生超短脉冲的机制分析

本文综述介绍了用DFDL产生ps量级超短脉冲的方法,着重讨论了用DFDL产生超短脉冲的机制理论分析。分析表明:用DFDL产生超短脉冲可以通过建立适当的速率方程,恰当设置参数求解来预言其总体行为。通过理论和实验结果的比较,可以认为DFDL产生超短脉冲的机制是自Q调制。     

白光发光二极管用SrGdLiTeO_6:Eu~(3+)红色荧光粉的浓度猝灭和温度猝灭行为

采用高温固相法成功合成出双钙钛矿结构SrGd_(1-x)LiTeO_6:xEu~(3+)(x=0.1-1.0)红色荧光粉,并采用X-射线衍射、漫反射光谱、光致发光光谱、电致发光光谱等测试手段对粉体的结构、光致发光特性以及发光二极管器件的光色电特性进行了系统研究.激发光谱、发射光谱和荧光衰减曲线测试结果表明Eu~(3+)的最佳掺杂浓度为x=0.6,更大的掺杂量会引起浓度猝灭.基于van Uitert浓度猝灭公式,提出一种更准确的表达形式用于拟合、分析能量传递类型,揭示出电偶极-电偶极作用导致浓度猝灭.Judd-Ofelt理论计算得出较高的跃迁强度参数和量子效率,说明高度畸变的非心C_1晶体场促使高效的超灵敏跃迁红光发射.在423 K时积分发光强度达到室温时的85.2%,热激活能经计算为0.2941 eV.基于此样品的发光二极管能够发出明亮的红光.综上所述,该类荧光粉表现出良好的发光效率、色纯度以及发光热稳定性,是一种潜在的近紫外激发白光发光二极管用红色荧光粉.     

鲁米诺化学发光猝灭法测定微量狄的研究

本文利用狄对鲁米诺－过氧化氢－铬（Ⅱ）体系化学发光的熄灭效应，建立了狄的流动注射化学发光分析法。该法灵敏度高，线性范围宽，仪器设备简单，操作方便。     

荧光素钠注射液荧光猝灭的研究

使用荧光素钠注射液进行眼底血管造影，显影清晰度和显影持续时间是造影的重要质量指标，荧光猝灭作用直接影响造影质量。本文研究了浓度，酸度，温度及重金属离子与荧光猝灭的关系。结果表明：荧光素浓度大于１．５５×１０＾－５ｍｏｌ·Ｌ＾－１时，随着浓度增大，荧光猝灭作用增强；酸度对荧光猝灭作用有明显作用，ｐＨ值小于８．５时，随着ｐＨ值升高而减弱，ｐＨ值大于８．５时，随着ｐＨ值升高而增强；温度对荧光猝灭作用呈线     

A Quenched Dye Laser Pumped by a KrF Excimer Laser

ＡＱｕｅｎｃｈｅｄＤｙｅＬａｓｅｒＰｕｍｐｅｄｂｙａＫｒＦＥｘｃｉｍｅｒＬａｓｅｒ￥ＸＵＥＳｈａｏｌｉｎ；ＬＯＵＱｉｈｏｎｇ；ＨＵＡＮＧＨｕｉｊｉｅ；ＤＵＬｏｎｇｌｏｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉ...     

一种新型聚合物激光染料

报道了一种新型聚合物染料的受激发射特性     

Polarization Dynamics of a Distributed-Feedback Dye Laser

The polarization dynamics of a dye-solution laser with light-induced distributed feedback (DFB) has been analyzed. A theoretical model of a DFB-laser, which makes it possible to calculate the dynamics of the lasing process for two orthogonally polarized modes, has been constructed. The influence of three main factors — rotational diffusion of dye molecules in solution, anisotropy of the saturation effect, and orientation of the electric vector of pumping beams with respect to the plane of their incidence — on the degree of polarization of output radiation has been investigated. Comparison of the calculated dependences with the results of experimental measurements has shown that the latter factor is of the greatest importance. It is shown that in this case, the degree of polarization of the output radiation of a DFB-laser can have a complex dynamics that does not correlate with the time behavior of the lasing pulse.     

Radiation Polarization Distribution Function of a Dye Laser

The Fokker–Planck equation for the distribution function of the intensity of an individual component has been solved in the approximation of the Ornstein–Uhlenbeck process within the framework of the formalism of the method of polarization components. Based on this solution, we have constructed the distribution functions of the degree of lasing radiation polarization, analyzed experimental data for a certain geometry of laser pumping, and determined the values of the distribution parameters, including the loss coefficients for the polarization component.     

高功率脉冲染料激光放大器物理设计

从理论研究出发,用激光增益理论得到了在平衡状态下忽略染料分子激发态吸收时,高功率脉冲梁料激光放大器物理设计的简单方法,同时以铜蒸气激光器双侧抽运的平均输出功率52.5W的脉冲染料激光放大器为例,对其物理尺寸进行了模拟设计。     

凝胶基质高效可调谐固态染料激光器

采用溶胶－凝胶工艺制成激光染料掺杂有机改性凝胶玻璃。用室温下调ＱＮｄ：ＹＡＧ激光器倍频光泵浦凝 胶基,成功地获得了高转换效率,长寿命,可调谐固态染料激光器的激光输出。其中ＳｉＯ２－Ｏｒｍｏｓｉｌ基质Ｐｙｒｒｏｍｅｔｈｅｎｅ５９７染料激光器,激光输出阈值低于１０μＪ,斜率效率η＝６１％,５５０－５９４ｎｍ波长范围内连续可调谐,激光输出能量下降１０％所承受的激光脉冲数大于２．５＊１０＾４个（激光泵浦频     

用氮分子激光器泵浦的绿光区染料激光

用氮分子激光器作泵浦源,对新合成的六种吡喃鎓盐染料的丙酮溶液,获得在501—585nm波段内连续可调激光输出。本文对这些染料的激光特性进行了分析和讨论,并对它们的热化学和光化学稳定性进行了研究。     

Dye Laser-pumped Cr: LiSrAIF_6 Laser

ＤｙｅＬａｓｅｒ－ｐｕｍｐｅｄＣｒ：ＬｉＳｒＡＩＦ_６Ｌａｓｅｒ￥ＷＵＸｉｎｇ（Ｄｅｐｔ．ｏｆＰｒｅｃｉｓｉｏｎＩｎｓｔｒｕｍｅｎｔＥｎｇｉｎｅｅｒｉｎｇ，Ｔｉａｎｊｉｎ３０００７２，Ｃｈｉｎａ）Ｔ．Ｏｋａｄａ，Ｋ．Ｋａｅｄａ（Ｄｅｐｔ．ｏｆＥｌｅｃ?..     

Frequency Regime of Generation of a Holographic Distributed Feedback Dye Laser

We carried out an experimental investigation of the frequency regime of generation of a holographic distributed feedback (DF) dye laser. We show that the convection induced in liquid by heating-up a solution in the excitation zone ensures self-pumping of the solution through this zone that is sufficient for stable operation of the laser in the regime of frequently repeating pulses without forced circulation of the solution through the cuvette. It is found that the main condition for the operation of a DF-laser in this regime is the sharp focusing of pumping radiation, which ensures transverse dimensions of the generation zone of less than 1 mm. In experiments, we produced stable generation of a holographic DF dye laser in the regime of self-pumping of a solution with a pulse repetition rate of up to 1 kHz with an efficiency of 10% and a spectral line width of 0.01 nm.