光学自增强效应与衍射效率的提高

利用含时光折交双光耦合方程数字模拟计算了掺铁铌酸锂晶体中双光耦合的动态过程,分析了空间电荷场及其位相、光折交光栅位相等光折交参量的变化过程,解释了光折变自增强效应,提出了提高光折交光栅衍射效率的有效方法．     

Dynamics of quintessential inflation

In this paper, we study a realistic model of quintessential inflation with radiation and matter. By the analysis of the dynamical system and numerical work about the evolution of the equation of state and cosmic density parameter, we show that this model is a good match for the current astronomical observation. The conclusion we obtain is in favour of the model where the modular part of the complex field plays the role of the inflaton whereas the argument part is the quintessence field. Numerical calculation shows that a heteroclinic orbit (solution of the dynamical system) is interpolated between early-time de Sitter phase (an unstable critical point) and a late-time de Sitter attractor.     

Three-step relaxed hybrid steepest-descent methods for variational inequalities

The classical variational inequality problem with a Lipschitzian and strongly monotone operator on a nonempty closed convex subset in a real Hilbert space is studied. A new three-step relaxed hybrid steepest-descent method for this class of variational inequalities is introduced.Strong convergence of this method is established under suitable assumptions imposed on the algorithm parameters.     

自发参量下转换的研究及其在光学计量中的应用

叙述了自发参量下转换辐射定标技术的发展历程,技术原理以及在光学计量学中的应用,并介绍了国外这一领域的进展。     

脉冲功率放大器相位测量方法

有源相控阵雷达对T／R组件相位一致性有严格的要求,脉冲信号相位的测试比较复杂,本文提出了三种微波脉冲功率放大器相位的测试方法。     

Theoretical Description of the Third Order Parametric Wave Mixing in a Gas-Filled Capillary of Femto-Second Laser Pulse

The theoretical signal-pressure curves are calculated from approximate analytical solutions of the coupled equations describing the third order parametric wave mixing in a gas-filled capillary of femto-second laser pulses, The comparison with the corresponding experimental curves suggests that the following three factors exert important influences on the degree of fitting between the theoretical and experimental results: the walk-off, the phase modulation, and the third order harmonic of idler pulse.     

非线性光学频率变换及准相位匹配技术

本文综述了非线性光学频率变换技术的发展及在激光与光电子领域中的地位与作用,概述了它们的基本原理、特点及关键技术,展示了其广阔的应用前景.     

无线系统中的RF器件与电路

介绍了下一代无线系统中存在的问题 ,分别概述了无线系统中 RF器件与电路的发展与现状。     

单力矩器大角速率动调陀螺仪力矩再平衡回路的分析与综合

针对仅有一个力矩器的大角速率动调陀螺仪,力矩器线圈必须通以与陀螺仪自转角速率同频率变化的交变电流的特点,分析了采用合成施矩方式的力矩再平衡回路的工作原理。根据系统要求,对放大校正环节进行了设计。通过系统仿真及实例,验证了仿真模型的可信性及设计的合理性。     

Tm(0.1)Yb(10.9)氟氧化物玻璃的直接上转换敏化发光

本文首次研究了Tm(0.1)Yb(10.9)氟氧化物玻璃在966nm半导体激光激发下的直接上转换敏化发光现象。测量发现存在很强的^1G4→^3H6的474nm三光子和较弱的^1D2→^3H6的362nm,^1D2→^3F4的452nm,^1G4→^3F4的650nm三光子以及^3F3→^3H6的681nm二光子上转换发光。并对他们的上转换机理做了简要的讨论分析。