双缝衍射缺级处两弱峰的相对光强分析与测量

本文分析和测量了双缝衍射缺级处附近两个弱峰的相对光强，并与计算机数值计算得到的理论值对比表明：理论描述与实验情景是相符合的。     

用于测量高功率激光远场光强空间分布的小畸变光强衰减与成像系统研究

介绍了用于测量星光装置激光远场空间分布的高衰减倍率与成像系统。它是高功率激光产时监测系统的组成部分。衰减器减倍数可以在１０＾－２－－１０＾－１２间变化，衰减成 给定条件下引入的附以像差被控制在２倍衍射极限之内，总的波像差小于２λ／３。     

实虚部关联的量子噪声和泵噪声对单模激光动力学性质的影响

采用具有实虚部关联的量子噪声和泵噪声驱动的单模激光损失模型，用线性化近似方法研究了反映激光动力学性质的光强关联函数，讨论了光强关联函数随时间的演化；并对线性化近似方法的适用范围进行了详细分析，分别讨论了量子噪声强度、泵噪声强度、量子噪声实虚部关联系数对光强相对涨落的影响，得出在小噪声、远离阈值时，线性化近似方法适用范围扩大；小噪声、远离阈值且当量子噪声实虚部无关联时，线性化近似方法适用范围最大的结论. 关键词： 单模激光 光强关联函数 光强相对涨落     

拼接光栅机械形变对远场光强的影响

分析了将多块较小的光栅使用机械拼接的方式制成超大面积光栅,能解决大面积光栅目前无法整块生产的情况,在实际拼接中光栅会出现很微量的应力变形。根据拼接光栅通常的形变特点,采用标量衍射理论建立了光栅形变的理论模型,并就两块光栅拼接的情况进行了计算和分析,发现形变同拼接误差一样,会对光栅的远场光强产生负面影响,微小的变形量都对远场光强造成破坏,因此对衍射光场的影响不可忽略;获得了光栅机械形变的容限;最后给出了预防形变的措施:可着重减小y方向上约束,并使用多层介质膜光栅降低光栅对能量的吸收。     

偏振光干涉的光强

对角度的正负号作了规定，进而建立了一个普适而简明的偏振光干涉的光强公式。     

定量测量衍射光强分布规律的两种新方法

本介绍了测量衍射光强分布规律的两种新的方法,并对不同方法进行了分析比较。     

入射角对格兰-泰勒棱镜透射光强的非线性扰动分析

格兰-泰勒(Glan-Taylor)棱镜(GTP)旋转一周时的透射光强曲线通常会产生非线性误差而偏离马吕斯定律,主要表现为周期性扰动和透射光强曲线2个波峰不等高. 以菲涅耳公式和多光束干涉理论为基础,借助几何模型,得到了格兰-泰勒棱镜的光强透射比公式,讨论了光束入射角对透射光强曲线2个波峰等高性的影响,较好地解释了实验中的非线性误差,给出了改进方向.     

闪光有效光强测定仪研究

论述闪光光源有效光强的测量方法及原理，并详细介绍我所自行研制的闪光有效光强测定仪。文中对仪器的工作原理，结构特点，技术性能和用途给予比较全面的论述，并给出了实测曲线。     

Determination of ratios of emission probabilities of Auger electrons and K-L-shell radiative vacancy transfer probabilities for 17 elements from Mn to Mo at 59.5 keV

The measurements of the K X-ray intensity ratio I(K_β)/I(K_α) for the 17 elements Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Rb, Sr, Y, Zr, Nb and Mo have been done following ionization by 59.5 keV γ-rays from a ²⁴¹Am point source. Ratios of emission probabilities of Auger electrons and the vacancy transfer coefficients have been extracted in terms of the intensity ratios. It is found that the present results agree well with earlier fitted values and the semi-empirical values.     

Intensity stabilization of dye laser radiation by saturated amplification

A novel scheme is proposed for stabilizing the intensity of a fluctuating laser source, using a partly saturated high gain traveling wave laser amplifier with a nonsaturable absorber distributed in the amplifying medium. Calculations for homogeneously broadened laser gain band in an adiabatic approximation are presented, which indicate that the stabilization factor can be increased by several orders of magnitude with the help of the absorber. An experiment is reported in which a two-stage dye laser amplifier with inserted attenuator, pumped by a nitrogen laser, is used to amplify and stabilize the intensity of an ultra-narrowband repetitively pulsed dye laser. The output intensity changes by less than a factor of four when the input is changed over three orders of magnitude. Work supported by the U.S. Office of Naval Research, Contract No. N00014-67-A-0112-0071, and by a Grant from the Research Development Fund, Stanford University. On leave from the Laboratorio de Elettronica Quantistica del CNR di Milano, Milano, Italy.     

Direct fit of experimental ro-vibrational intensities to the dipole moment function: Application to HCl

A dipole moment function (DMF) for hydrogen chloride (HCl) has been obtained using a direct fit approach that fits the best available and appropriately weighted experimental data for individual ro-vibrational transitions. Combining wavefunctions derived from the Rydberg-Klein-Rees (RKR) numerical method and a semi-empirical DMF, line intensities were calculated numerically for bands with Δv=0, 1, 2, 3, 4, 5, 6, 7 up to v′=7. The results have demonstrated the effectiveness of inclusion of rotational dipole moment matrix elements and appropriate weighting of the experimental data in the DMF fitting. The new method is shown to be superior to the common method of fitting only the rotationless dipole moment elements, while at the same time being simple to implement.     

面阵CMOS光纤光谱仪研制

研制了一种以非对称交叉Czerny-Turner光路为结构的互补金属氧化物半导体小型光纤光谱仪样机,探讨了以面阵互补金属氧化物半导体图像传感器作为光电探测器的光度测量准确性和线性问题,分析了杂散光对吸光度测量的影响.结论是:通过光强定标和非线性修正后,互补金属氧化物半导体小型光纤光谱仪可以满足一般的应用要求,其光谱测量范围为380~800 nm,光谱带宽约6 nm,积分时间1~500 ms,波长准确度±1 nm,光度准确度±0.03 AU.该光谱仪具有小型化、低成本、速度快等优点.     

Measurement of sound intensity using a single moving microphone

A method for measuring sound intensity by using a single moving microphone is proposed. Experiments that confirm the validity of this method are reported and the advantages and disadvantages of the method are discussed.     

基于相位/强度调制的伪毫米波超宽带信号的光学辅助探测（英文）

针对伪毫米波超宽带信号脉冲宽度窄且信号强度低而不易探测的特点,本文提出了两种光学辅助包络探测方案.将伪毫米波超宽带信号调制到光载波上,利用光纤布喇格光栅带通滤波器滤出调制器输出的第一边带信号,通过光电探测器和低通滤波器便可以得到用于判决的伪毫米波超宽带信号的包络信息.数学推导和仿真分析了分别采用相位调制器和强度调制器对输出包络信号振幅的影响.研究结果表明:强度调制器需要偏置控制电路来稳定偏置点的位置,当强度调制器工作在最小传输点时,得到的包络信号幅值最大;相位调制器无需偏置控制电路,其输出信号包络的幅值等于使用强度调制器的系统可得到的最大值;使用相位调制器的系统较使用强制调制器的系统具有结构更简单和插入损耗更低的特点.     

飞秒激光扫描自相关仪

本文报道了一种测量飞秒激光脉冲宽度的扫描自相关仪,其扫描频率为25Hz,测量范围从20fs到900fs.采用的是BBO倍频晶体,测量光谱范围从700nm～1000nm.     

数字化声学测量技术 Ⅱ.数字式声强及声功率测量系统

本文介绍在数字声学测量分析系统中，通过双传声器信号互谱密度的计算进行声强及声功率测量的基本原理。该数学分析系统由微计算机，数字信号处理卡和Ａ／Ｄ变换卡组成。在一个数字系统中，通过快速傅里叶变换（ＦＥＴ）进行互谱计算是十分有效的。本文着重介绍了，在声强的测量分析中对声强探头两传声器的固有相位差进行补偿的重要性和补偿方法，这是声强测量的重要环节。     

谱峰相对强度比法在碳炔含量测定中应用

碳炔材料是一种不溶不熔高聚物 ,红外谱图是最简易的一种分析测试工具。将 C—H键的振动峰面积与 C C键的振动峰面积相关联 ,用谱峰相对强度比法测定不同制备条件下产生的碳炔材料的相对含量。结果表明 ,两者比值对反应物浓度的变化具有相关性 ,可用作碳炔材料制备中实验条件的优选手段。     

Analysis of intensity modulation performance in WDM-PON network

This paper mainly does research and analysis on anti-dispersive performance and anti-nonlinear performance for intensity modulation formats such as NRZ, RZ, CS-RZ, DRZ, MD-RZ in 40 Gbps high-speed single-channel optical transmission system. It compares the five pattern modulation formats in dispersion tolerance, nonlinear tolerance, and advantages and disadvantages in transmission distance. Anti-nonlinear effect ability of CSRZ and RZ are stronger than that of NRZ code; in the single-channel transmission system, DRZ and improved modulation format MDRZ have better resistance for anti-nonlinear performance, so they are suitable for long-distance transmission. RZ has the minimum dispersion tolerance. NRZ has higher spectrum efficiency than RZ, and thus have a better dispersion tolerance. CSRZ code has higher spectral efficiency, higher dispersion tolerance and nonlinear tolerance than RZ code, making it more suitable for long distance transmission.