KrF离子准分子真空紫外辐射及动力学过程

利用激光等离子体软Ｘ射线激励，观察到一种新型离子准分子－ＫｒＦ离子准分子的真空紫外连续谱，其辐射中心波长位于１４８ｎｍ附近，并在实验和理论上对其动力学过程进行分析。     

钠双原子分子b~3Σ_g~ —x~3Σ_u~ 跃迁激光振荡探索及几个新谱区观察

本文报道了随金属蒸气热管炉中填充气体气压变化,Na_2b~3∑_g~ —x~3∑_u~ 跃迁的不同行为.测量了小信号增益系数,实验证明了该跃迁实现激光振荡的可能,谐振腔效应预示着该谱区内的激光作用.本文还报道了0.78um附近的新的光谱区.     

Image recognition of laser radar using linear SVM correlation filter

Through deducing the relationship between support vector machine(SVM)and correlation principle,the optimal hyperplane is proved as a correlation filter when the kernel function is the linear kernel.So a new correlation filter,named linear SVM correlation filter(LSCF),is proposed.The filter has not only shiff-invariance,but also SVM properties.The real images of laser radar are used as experiment data,and LSCF is used to solve the in-plane rotation invariance.The results show that the filter can recognize the different rotated objects,and the correlation output is stable.The filter is insensitive to the noise and gray change,and has good discrimination ability.In the same design way,LSCF is also suitable to solve other problems of correlation distortion.     

窄脉冲相干激光雷达偏频锁定系统仿真研究

鉴于偏频锁定技术在激光外差探测和激光雷达等方面的广泛作用,基于可编程逻辑器件,设计了适用于窄脉冲激光外差信号的偏频锁定控制系统。在设计中,使用超高速电压比较器进行波形变换、多脉冲鉴频和大概率均值滤波进行数字鉴频,采用小步长快速控制方法进行调频,利用数模转换器和线性放大电路输出调频信号。借助信号发生器产生40ns脉宽的模拟外差信号对系统进行了仿真,实现了设计功能。对系统进行鉴频和调频测试,在40ns脉宽时鉴频误差范围为-7.5MHz～+7.7MHz。     

Optically pumped terahertz lasers with high pulse repetition frequency: theory and design

Optically pumped terahertz （THz） lasers with high pulse repetition frequency are designed. Such a laser includes two parts： the optically pumping laser and the THz laser. The structures of the laser are described and analyzed. The rate equations for the pulsed THz laser are given. The kinetic process and laser pulse waveform for this kind of laser are numerically calculated based on the theory of rate equations. The theoretical results give a helpful guide to the research of such lasers.     

基于光场感生电离类镍氪系统峰值增益系数的计算

利用自行编制的辅助程序将原来仅以麦克斯韦分布为基础的Cowan程序推广到适用于任意电子能量分布情形下获得的光场感生电离 (OFI)等离子中的一些原子参数 ,在考虑多普勒加宽和自然加宽 ,对离子数密度分别为1× 10 17cm-3 和 3.2× 10 17cm-3 的情况下的类镍氪系统的增益系数进行了估算 ,理论上的峰值增益系数为14cm-1、141cm-1。     

钾色散光学滤波器的滤波特性

从理论和实验两个方面对强度磁场中钾D2线法拉第反常色散滤波器的特性进行了研究,在不同工作条件下,获得线芯和线翼两种方式的法拉第反常色散滤波器,并讨论了温度对其滤波特性的影响。     

High order generalized permutational fractional Fourier transforms

We generalize the definition of the fractional Fourier transform (FRFT) by extending the new definition proposed by Shih. The generalized FRFT, called the high order generalized permutational fractional Fourier transform (HGPFRFT), is a generalized permutational transform. It is shown to have arbitrary natural number M periodic eigenvalues not only with respect to the order of Hermite－Gaussian functions but also to the order of the transform. This HGPFRFT will be reduced to the original FRFT proposed by Namias and Liu's generalized FRFT and Shih's FRFT at the three limits with M=+∞, M=4k(k is a natural number), and M=4, respectively. Therefore the HGPFRFT introduces a comprehensive approach to Shih's FRFT and the original definition. Some important properties of HGPFRFT are discussed. Lastly the results of computer simulations and symbolic representations of the transform are provided.     

二芳基马来酸酐吸收光谱的计算研究

在B3LYP/6-311++G(3df, 3pd)//b3LYP/6-31G(d)和TD/6-31G(d)//B3LYP/6-31G(d)水平上对二芳基马来酸酐的电子吸收光谱进行了研究。2,3-(2,4-二甲基噻吩-3)马来酸酐的开式结构和闭式结构的S₁, S₂和S₃跃迁的计算结果分别为390, 360.5, 339.4; 584.6, 395.8, 370.2 nm; 与类似物2,3-(2,4,5 -三甲基噻吩-3)马来酸酐的开式结构和闭式结构的S₁和S₂, 实验值390,331; 552, 386 nm一致。振子相对强度计算结果与吸收峰强度一致。     

分数相关畸变不变模式识别特性研究

本文从理论上分析了分数相关器的分数级次对相关输出面能量分布的影响,利用数值模拟方法,对基于匹配滤波结构的分数相关器畸变不变模式识别特性进行了深入的讨论,并与传统相关器进行了比较.结果表明在畸变不变模式识别中,分数相关器比传统相关器有着更强的畸变不变相关识别能力.