Polarization-Sensitive Recording Media Based on Fluorophore (Lucifer Yellow) Dye for Holography

Optics and Spectroscopy - Polarization-sensitive hologram media based on polyvinylpyrrolidone and gelatin matrices, into which the Lucifer Yellow and Coumarin 466 dyes have been introduced, have...     

卫星激光通信发展现状与趋势分析(特邀)

卫星激光通信凭借其宽带宽以及无电磁频谱约束等特点,成为解决卫星微波通信带宽瓶颈和缓减卫星频谱资源紧张,实现卫星高速通信的有效手段。本文介绍了卫星激光通信的系统组成及特点,分析了国内外卫星激光通信技术领域的发展脉络、最新研究进展和未来发展规划。结合未来空间网络与深空探测需求,从高速化、深空化、集成化、网络化、全光化五个方面总结了未来发展趋势,并对未来涉及的关键技术进行了讨论,为我国卫星激光通信技术研究提供借鉴和参考。     

Transient Nutation EPR Spectroscopy of Condensed Media (Review)

The application of transient nutations in EPR spectroscopy of condensed media is considered. The main methods of formation and observation of transient nutations are presented. The laws governing this phenomenon in twolevel and multilevel spin systems and also in inhomogeneous broadening of EPR lines are described. Recent advances in the use of transient nutations to separate overlapping spectra, identify quantum numbers and quantum transitions, investigate the kinetics of photoinduced paramagnetic centers, and determine relaxation times for a wide range of crystalline and disordered media are presented.     

Optoacoustics of Inhomogeneous Biomedical Media: Competition of Mechanisms and Prospects for Application (a Review)

Acoustical Physics - The article reviews the achievements and problems of opto(photo)acoustics in recent years for biomedical applications in real media and real optoacoustic (OA) conversion modes....     

Editorial for Focus Issue on Digital and Computer Generated Holography （DCH）

This focus issue Digital and Computer Generated Holography （DCH） combines the contributions from digital holography （DH） and computer-generated holography （CGH） into a single issue. We have classified the papers into four topics： holographic microscopy, computer-generated holography,     

History of Development of the Methods and Interference Devices for Measuring a Small Optical Phase Difference (Review)

Optics and Spectroscopy - Interferometry methods, which are applied for measuring quite small phase differences in fundamental and applied problems, are considered. It is shown that first...     

试验训练使能体系结构(TENA)的进展与应用情况

未来的作战与训练概念高度依赖于以网络为中心的作战能力,美国国防部认为迫切需要在试验与训练领域建立一种能克服当前“烟囱式”设计、实现靶场资源之间互操作、重用和可组合的新技术。美军借鉴了多种体系结构的研究和应用成果,构建了试验训练使能体系结构(TENA)。本文对TENA的进展、在美军靶场中的最新应用情况及未来发展方向进行阐述,并描述了针对我国靶场资源现状所带来的启示。该体系结构将为未来开发精细强大的试验和训练系统提供必要的支撑。     

Features of the Development of Electron-Optical Systems for Pulsed Terahertz Traveling-Wave Tubes (Review)

We present an analysis of the current state and development of pulsed amplifying traveling-wave tubes for terahertz radiation operation at frequencies of at least 200 GHz, as well as the development prospects of the principles of creating electron-optical and magnetic systems. The possibility of using field emission cathodes based on carbon nanotubes for constructing an electron-optical system with the compression of a sheet beam is discussed. A numerical simulation of a field emission electron gun forming a sheet electron beam for traveling-wave tubes of the terahertz range is carried out.

     

基于平场全息凹面光栅的舌诊用光谱仪的研制

由于传统的望舌诊断法过于依赖中医师的经验判断,导致误诊的概率相对较大,而基于图像处理的舌诊法受光源、图像采集设备影响较大,同时对于病理不同而颜色相近的舌象识别率不高。为了克服上述缺点,利用舌光谱的“指纹效应”,通过使用光谱法来对不同性状的舌象进行诊断,为了实现这一目标,研制了一款用于舌象诊断的光谱仪,同时为了克服传统分光器件的不足,分光系统中采用了平场全息凹面光栅作为分光器件,能保证系统小型化、光通量利用率提高的同时,改善光谱成像的质量和分辨率。通过系统实验测试,该光谱仪的光谱范围达到340～850 nm, 分辨率优于2 nm,同时通过模拟实验充分验证了该系统的有效性。     

On the Possibility of Studying the Fraction of Inhomogeneities in Optical Nonlinear Media Using Time-Resolved Inline Digital Holography

Technical Physics - An approach to determining the fraction of inhomogeneities of the optical nonlinear properties of a transparent medium characterized by a spatial variation of nonlinear...     

Material parameters of metamaterials (a Review)

A theory of the homogenization of a certain class of metamaterials is stated. These metamaterials are volume lattices of electric and magnetic dipoles that are resonant with frequencies that are considerably lower than that of the first Bragg resonance of the lattice. It was shown that, for plates of a metamaterial, which are described by bulk material parameters, transition layers play an important role, and the known Drude notion of transition layers is significantly revised. The paper also discusses a more widespread method of determining the material parameters of metamaterials based on the extraction of the refractive index and the characteristic impedance from the scattering matrix of the plate of the metamaterial. The physical meaning of the material parameters obtained in this way is clarified, and the concept of Bloch lattices related to it is discussed. It is shown that the bulk material parameters and the parameters of transition layers can also be extracted from components of the scattering matrix of plates.     

The Modern Problems of Ultrafast Magnetoacoustics (Review)

Acoustical Physics - A review of modern lines of research in the field of ultrafast magnetoacoustics is presented. Effects of interaction of ultrashort (picosecond) acoustic pulses with a magnetic...     

Zone Plates for X-Ray Focusing (Review)

Various zone plates: amplitude, amplitude-phase, and phase ones (including Fresnel and Gabor zone plates, Laue- and Bragg-Fresnel lenses, photon sieves, and aperiodic zone plates), as well as their properties and X-ray focusing possibilities, are described and analyzed.     

Propagation of Acoustic Waves in Piezoelectric Media with a Subsonic Electric Current

Acoustical Physics - Sound propagation in a piezoelectric medium with a periodic lattice in the presence of charge carrier drift is considered. A periodic lattice creates a scattered component with...     

Physics and Technology of III–V Heterostructures: Current Status and Trends in the Development

Rapid progress in semiconductor electronics and transition from micro- to nanoelectronics result from progressively smaller dimensions of complementary metal-oxide-semiconductor (CMOS) transistors, development of new single-electron devices, and optical and quantum logical elements. The development of nanotechnologies is an integral part of this process. The present paper reviews the current status of research in molecular-beam epitaxy performed at the Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences (Novosibirsk).