产生二步混合激发受激辐射的光延时效应研究

本文对双光束二步混合激发气体样品产生受激辐射的光延时效应进行了研究.通过三能级模型计算了激发能级上粒子数布居随时间的变化,并以实验进行验证.计算得到与实验值符合较好.     

满足Cond_l(A)=1(l=1,∞)的矩阵A的充要条件

本文导出了长方矩阵A的条件数Cond(A)=||A||l||A~ ||l=1(l=1,∞)的充要条件;而且给出了Cond(A)=1时A的矩阵结构和元素结构形式;同时指出文[6]中两个主要定理的错误.     

光学泵浦的锂分子激光

以可见染料激光泵浦锂分子,在高于900℃的蒸气温度下,获得了由理分子A¹∑_u⁺态跃迁到基态X¹∑_g⁺的位于874—912nm区的许多光泵激光输出。谐振腔使输出信号增强约9倍。对部分激光跃迁的振转量子数作了标识。 关键词：     

Achievement of Narrow-Band CARS Signal by Manipulating Broad-band Laser Spectrum

We theoretically demonstrate the achievement of narrow-band coherent anti-Stokes Raman scattering （CARS） signal by manipulating broad-band probe spectrum. The narrowing of the CARS signal depends on the spectrum bandwidth of the probe beam, and thus high-resolution CARS signal for a complicated quantum system can be obtained by the simple spectrum manipulation. Furthermore, the energy-level diagram for the complicated quantum system can also be labelled by measuring the CARS signal at a given frequency.     

碰撞对钠分子菱形能级系统中高位能能布居的影响

在实验室上研究了碰撞过程对钠分子菱形能级系统高位能级布居的影响.无多普勒加宽的洛仑兹尖峰随缓冲气体压力的增大很快消失;加入少量缓冲气体,碰撞激发过程对以多普勒宽度为特征的信号有一定的增强作用,但加入过量缓冲气体会由于消布居作用使信号减弱.上述结果在速率方程近似下加以解释.     

1-(2-吡啶偶氮)-2-萘酚薄膜的非线性光学特性研究

运用Ｚ扫描方法研究了１－（２－吡啶偶氮）－２－萘酚薄膜的非线性光学特性。用皮秒脉冲激光测得在５３２ ｎｍ 处、光强较低时χ（３）Ｒ ＝ １．２９×１０－ ９ ｅｓｕ, β＝ ４２ ｃｍ ／ＧＷ; 同时研究了不同光脉冲能量时的非线性吸收特性, 发现其非线性吸收随着光强的增大由反饱和吸收转为饱和吸收     

稀土镧离子对1,10-二氮杂菲紫外荧光的增强效应

测量了１,１０－二氮杂菲和硝酸［二－（１,１０－二氮杂菲）合镧］甲醇溶液的单光子和双光子激发紫外荧光谱。研究表明：镧离子的配位对１,１０－二氮杂菲的紫外荧光效率具有显著的增强作用,镧离子的桥梁作用增强了１,１０－二氮杂菲之间的耦合,并引起１,１０－二氮杂菲紫外荧光谱的红移。     

温梯法生长的Ti:Al2O3晶体的光谱分析

本文研究了不同掺Ti^3＋浓度对温梯法生长的Ti：Al2O3晶体吸收光谱、荧光光谱和X射线衍射光谱的影响。根据吸收光谱提出了一个色心模型。对比了样品各处420nm荧光谱，发现掺Ti^3＋浓度越大，该处荧光强度越弱，同时解释了420肿处荧光峰的起源。对比了样品各处720nm处的荧光谱，发现掺Ti^3＋浓度越大，该处荧光强度越强。X射线衍射谱（XRD）表明，衍射峰强度随掺Ti^3＋浓度的增大而逐渐增强。     

ON SOLUTIONS OF QUATERNION MATRIX EQUATIONS XF-AX=BY AND XF-A=BY

In this paper,the quaternion matrix equations XF-AX=BY and XF-A=BY are investigated.For convenience,they were called generalized Sylvesterquaternion matrix equation and generalized Sylvester-j-conjugate quaternion matrix equation,which include the Sylvester matrix equation and Lyapunov matrix equation as special cases.By applying of Kronecker map and complex representation of a quaternion matrix,the sufficient conditions to compute the solution can be given and the expressions of the explicit solutions to the above two quaternion matrix equations XF-AX=BY and XF-A=BY are also obtained.By the established expressions,it is easy to compute the solution of the quaternion matrix equation in the above two forms.In addition,two practical algorithms for these two quaternion matrix equations are give.One is complex representation matrix method and the other is a direct algorithm by the given expression.Furthermore,two illustrative examples are proposed to show the efficiency of the given method.     

碰撞对钠分子梯形能级系统高位能级布居的影响

以氩气为缓冲气体,在实验上研究了碰撞过程对钠分子梯形能级系统高位能级两种布居过程的影响。对于双光子激发过程,由于消相碰撞,无多普勒加宽的洛伦兹尖峰随缓冲气体压力的增大而很快消失,加入少量缓冲气体时,碰撞激发过程对以多普勒宽度为特征的信号有一定的增强作用,但加入过量缓冲气体会由于消布居作用使信号减弱,对于主要通过碰撞实现高位能级布居的过程,加入缓冲气体对高位能级布居起关键作用,在速率方程近似下解释了上述结果。