谐振式硅基二氧化硅集成光学陀螺的克尔噪声研究

分析了集成光学谐振式陀螺中克尔噪声的产生机理,利用导波光学理论建立了克尔噪声的数学模型,并基于此模型得出了克尔噪声对集成光学陀螺极限灵敏度影响的数学表达.分析了不同光源谱宽下谐振腔腔长与克尔噪声引起陀螺输出偏移之间的关系;针对集成光学陀螺中克尔噪声的主要产生原因-谐振腔中顺、逆时针的光强不均衡,仿真分析了系统中集成光学...     

折衍射混合复消色差望远物镜中的色球差

一个正透镜、一个负透镜及一个衍射光学元件以不同的组合可以构成两种折衍射混合光学系统.当这两种系统消球差、彗差及复消色差后会产生不同的色球差.通过赛德尔像差理论,分析了这两种结构产生不同色球差的原因.计算表明当衍射光学元件以负透镜的平面为基底时产生的色球差为以正透镜的平面为基底时产生的色球差的7倍.对衍射光学元件以负透镜的平面为基底的情形,提出了减小系统色球差的解决办法,使系统色球差减小到0.307 mm.另外设计了一个传统复消色差光学系统,并和折衍射混合光学系统进行了比较,分析表明,衍射光学元件可代替传统光学系统中的特殊光学材料并使系统达到相同的成像质量.最后讨论了衍射光学元件的衍射效率对系统成像质量的影响.     

光学低通滤波器的光学传递函数分析

光电成像系统的抽样过程会引起图像频谱在频谱空间上的多次复制,如果抽样过程不满足系统的奈奎斯特条件,相邻的频谱项就会产生混叠.光学传递函数可以反映系统中光学成像,抽样和重建等各个过程对图像信号频谱的响应.通过对使用光学低通滤波器(OLPF)光电成像系统的光学传递函数的分析,表明光学低通滤波器可以有效地限制图像的频谱宽度,使抽样满足奈奎斯特条件,达到消除频谱混叠,改善重建图像质量的目的.     

低温下测量超导球转子极轴偏角的光学读取系统的研究

本文介绍了一种低温下测量超导球转子极轴偏角的光学读取系统及其读取原理，讨论了光学读取系统照明产生的热量对转子正常工作的影响．分析结果表明，此光学读取系统可用于液氦温区下测量超导球转子的极轴偏角．     

低温下测量超导球转子极轴偏角的光学读取系统的研究

本文介绍了一种低温下测量超导球转子极轴偏角的光学读取系统及其读取原理,讨论了光学读取系统照明产生的热量对转子正常工作的影响.分析结果表明,此光学读取系统可用于液氦温区下测量超导球转子的极轴偏角.     

衍射光学元件的设计方法

衍射光学是基于光学衍射原理和利用计算机产生全息图和相息图以及微电子加工技术而发展起来的一个新的光学分支。衍射光学元件能够同时实现几种光学功能，从而实现光学元件的微型阵列化与集成化。着重介绍基于衍射标量理论、衍射光学元件的设计原理和相关的算法。通过简单的例子来说明设计的步骤和结果。     

二维光学沃尔什—哈特曼变换

从光学变换的基本方程出发,分析了变换所需的空间横向调制型全息透镜的相位误差,提出用计算机产生全息图和光学全息相结合的方法产生高精度的二维变换全息透镜.在实验上实现了二维32序的光学沃尔什-哈特曼变换,实验结果与理论计算一致.     

二元光学进展

对二元光学的产生和发展作了简要的介绍，通过说明二元学光元件的设计和制作过程，建立二元光学的基本概念，阐述了二元光学的主要应用。     

用瞳函数控制减小离散成像系统中的频谱混淆

离散控制器由于欠抽样产生频谱混淆,介绍分析了减少混淆的一种光学预滤波法：设计光学成像系统的瞳函数以产生期的光学传递函数,使期 对抽样数据进行有效的预滤法,从而完全抑制混淆。     

一种新颖的实现冷原子囚禁的可控制光学六阱及其光学晶格

提出了一种利用单束平面光波照明二元π相位板与透镜组合系统实现冷原子或冷分子囚禁的可控制光学六阱的方案,计算与分析了该方案产生的光学势阱的光强分布和光学六阱的特征参数、强度梯度及其曲率,讨论了从光学六阱到双阱或到单阱的演化过程,研究表明通过改变二元π相位板上的相位分布,即可实现光学六阱到双阱或到单阱的连续双向演化.     

Near threshold production of neutral pions by complex particles

Cross sections for the inclusive neutral pion production cross section have been measured for near threshold energy ³He particles on complex nuclei. The results of these measurements are of order 10^?36 cm²/sr · MeV. The neutral pion cross section for 710 MeV ⁴He on ¹²C has been found to be comparable to the production cross section for nucleons, 10^?30 cm²/sr · MeV. Comparisons are made with a naive model relating complex particle production to nucleon production of pions.     

A study of ϱ0 and f0 production in 4 GEV/cπ+d interactions

The production of ?⁰ and f⁰ mesons has been studied using a sample of 15485 fits to the reaction π⁺d → p_spπ⁺π^? at 4 GeV/c. Results are presented on the spin structure and production mechanisms of these resonances. An Estabrooks and Martin analysis has been carried out in the ?⁰ region, giving results similar to those obtained in their analysis of 17.2 GeV/c data. Natural parity exchange is less important at our momentum, however. In the case of f⁰ production, we find evidence for the presence of s-, p- and d-waves in the π π system. Averaging all events in the f⁰ peak, the s- and d-waves are found to be close in phase. The f⁰ production mechanism has been investigated using a positivity analysis of the complete J = 0, 1, 2 density matrix, and the same general features are observed as are seen in ?⁰ production. However, the unnatural parity exchange component is found to be even more dominant in f⁰ production than in ?⁰ production. Our results are compared with the predictions of various models.     

Production of π 0 and η mesons in carbon-induced relativistic heavy-ion collisions

The production of π ⁰ and η mesons has been investigated in the system ¹²C+¹²C at 0.8A GeV, 1.0A GeV, and 2.0A GeV using the TAPS photon detector. The production cross sections and transverse-momentum distributions measured around midrapidity extend the existing systematics of neutral-meson production to light systems and the highest energy available at the GSI accelerator facility. At all beam energies scaling of the differential production cross section with the transverse mass of the emitted meson is observed. In addition π⁰ production has been studied in the mass-asymmetric systems ¹²C+¹⁹⁷Au and ¹⁹⁷Au+¹²C at 0.8A GeV.     

Lepton and hadron pair production in two-photon reactions

We have measured the production of charged particle pairs in e⁺e^? initiated two-photon reactions. The observed rates and invariant mass spectra agree with expectations from QED if a resonant π⁺π^? production at the f⁰ mass is added. Assuming dominance of the helicity 2 production we obtain the width Γ(f⁰→γγ) = 2.3 ± 0.5 keV.     

Possibility of radionuclide production for PET diagnostics and brachyteraphy on the INR RAS linac

The technology of radionuclide production for positron-emission tomography on the proton linac of the Institute for Nuclear Research, Russian Academy of Sciences, is considered. A prototype of a combined target unit for production of positron-emitting radionuclides ¹¹C, ¹³N, and ¹⁸F in the proton linac beam is presented. The production of medical isotopes ¹⁰³Pd, ^{124, 125}I, and ¹³¹Cs is briefly discussed.     

Subthreshold K− production in pion-nucleus reactions

The inclusive subthresholdK ^– mesons production in charged pion-induced reactions is analyzed with respect to the one-step production processes on the basis of an appropriate first collision model, which allows one to take into account the various forms of an internal nucleon momentum distribution. Free elementary production processes are described by the phase space calculations normalized to the corresponding total experimental cross sections. Simple parametrizations for the total cross sections of theK ^– production in pion-nucleon collisions are given. Primary-pion energy dependence of the inclusive cross sections for K^– production in ⁺ C– collisions is calculated. The influence of the uncertainties in the elementaryK ^– production cross sections close to the production threshold on theK ^– yield is explored.The authors acknowledge stimulating discussions with V. Koptev on the initial stage of this study.     

Excited lepton production at LEP and HERA

General expressions for single and pair production cross sections of excited leptons (e ^*,µ^*,v ^*) are presented. Specific results are shown for a realisticSU(2)×U(1) invariant model. Pair production ine ⁺ e ^? annihilation can measure anomalous magnetic moments of excited leptons. Single production ofe ^* is dominated by thet-channel γ exchange contribution which makes its detection feasible up to masses just below thee ⁺ e ^? c.m. energy. Due to this small |t| enhancement effect, contributions from elastic and resonance scattering inep production ofe ^* are substantial. Realistic estimates of the excited lepton production cross section at HERA are given     

D *± inclusive production in two-photon process at $sqrt {s}=58 {⤪ GeV}$ in TRISTAN

Using the VENUS detector at TRISTAN we have investigated the charm-quark production by detecting D ^{*+ -} mesons in the two-photon process of e ⁺ e ^{t -} collisions. The study has confirmed that the charm-quark production rate is larger than that predicted from direct cc? production alone. The distribution of the transverse momentum of the D ^{*+ t-} mesons and the forward energy flow associated with the D ^{*+ -} production suggest that the main part of the observed excess comes from the contribution of a resolved photon process.     

Inclusive production of D and K mesons in e+e− annihilation

We present measurements of the cross section for inclusive D and K meson production in e⁺e^? annihilation in the center of mass energy range 3.6 to 5.8 GeV. D production accounts for most of the increase in the total cross section for hadron production in e⁺e^? annihilation at energies above 4 GeV.     

New fermions ate + e − colliders I. Production and decay

We analyze the production in e⁺e^– collisions of new heavy fermions stemming from extensions of the Standard Model. We write down the most general expression for the production of two heavy fermions and their subsequent decays, allowing for the polarization of thee ⁺ e ^– initial state and taking into account the final polarization of the fermions. We then discuss the various decay modes including cascade and three body decays, and the production mechanisms, both pair production and single production in association with ordinary fermions.