射频阱中原子团簇离子的选择存储及其应用

ＴｒｉｐｌｅＤｉｆｅｒｅｎｔｉａｌＣｒｏｓＳｅｃｔｉｏｎｓｆｏｒＥｌｅｃｔｒｏｎＩｍｐａｃｔＩｏｎｉｚａｔｉｏｎｏｆＨｅｌｉｕｍ－ｌｉｋｅＬｉｔｈｉｕｍＳｈｉＱｉｃｕｎＣｈｅｎＺｈａｎｇｊｉｎＣｈｅｎＪｉＸｕＫｅｚｕｎＤｅｐａｒｔｍｅｎｔｏｆＭｏｄ...     

High Reflection Ge_(0.45)Te_(0.55) Recording Films

ＨｉｇｈＲｅｆｌｅｃｔｉｏｎＧｅ０．４５Ｔｅ０．５５ＲｅｃｏｒｄｉｎｇＦｉｌｍｓＬＩＵＨｕｉｙｏｎｇＪＩＡＮＧＦｕｓｏｎｇＭＥＮＬｉｑｉｕＦＡＮＺｈｅｎｇｘｉｕＧＡＮＦｕｘｉ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓ＆ＦｉｎｅＭｅｃｈａｎｉ...     

MEASUREMENTS OF Fe AND Cu K-Shell IONIZATION CROSS SECTIONS BY SLOW ELECTRON IMPACT

ＭＥＡＳＵＲＥＭＥＮＴＳＯＦＦｅＡＮＤＣｕＫ－ＳｈｅｌＩＯＮＩＺＡＴＩＯＮＣＲＯＳＳＳＥＣＴＩＯＮＳＢＹＳＬＯＷＥＬＥＣＴＲＯＮＩＭＰＡＣＴＬｉＴａｉｈｕａＡｎＺｈｕＬｕｏＺｈｅｎｇｍｉｎｇＣｅｎｔｅｒｆｏｒＲａｄｉａｔｉｏｎＰｈｙｓｉｃｓ，Ｉｎｓ...     

机械合金化Fe—Cu系统的EXAFS研究

ＥＸＡＦＳ研究Ｆｅ－Ｃｕ系二元金属的Ｆｅ和Ｃｕ配位环境随球磨时间及组成的变化情况，结果表明机械合金化方法能扩展Ｆｅ和Ｃｕ金属的固溶范围并形成纳米尺寸的非平衡亚稳态合金晶粒，Ｆｅ３０Ｃｕ２０（１６０ｈ）中Ｃｕ的Ｋ吸收谱和ＲＳＦ出现ｂｃｃ结构的下，其Ｆｅ－Ｃｕ的合昌粒为ｂｃｃ结构；Ｆｅ６０Ｃｕ４０（１６０ｈ）中Ｃｕ和Ｆｅ的ＲＳＦ都为ｆｃｃ结构，其合金晶粒的结构与Ｆｅ３０Ｃｕ２０的不同，为ｆｃｃ结构，但     

A Simpler and More Precise Data Processing Method of SPIDER and Its Apparatus Design

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｈｅｍｅｔｈｏｄｓｔｈａｔｃａｎｍｅａｓｕｒｅｔｈｅｐｈａｓｅａｎｄｔｈｅ ｐｕｌｓｅｄｕｒａｔｉｏｎｍａｉｎｌｙｉｎｃｌｕｄｅｔｈｅＦＲＯＧ[1] (ｆｒｅｑｕｅｎｃｙ -ｒｅｓｏｌｖｅｄｏｐｔｉｃａｌｇａｔｉｎｇ)ａｎｄｔｈｅＳＰＩＤＥＲ[2 ] (ｓｐｅｃｔｒａｌ ｐｈａｓｅｉｎｔｅｒｆｅｒｏｍｅｔｒｙｆｏｒｄｉｒｅｃｔｅｌｅｃｔｒｉｃ ｆｉｅｌｄｒｅｃｏｎｓｔｒｕｃｔｉｏｎ) .ＦＲＯＧ[1] ｕｓｅｓｔｈｅｕｎｋｎｏｗｎｐｕｌｓｅｉｔｓｅｌｆａｓａｔｉｍｅ ｄｅｌａｙｅｄ ｇａ…     

Suppression of Interference Speckles in the Uniform Line Focus System of Segmented Wedge Array Using Phase－disturbed Plate

ＳｕｐｐｒｅｓｓｉｏｎｏｆＩｎｔｅｒｆｅｒｅｎｃｅＳｐｅｃｋｌｅｓｉｎｔｈｅＵｎｉｆｏｒｍＬｉｎｅＦｏｃｕｓＳｙｓｔｅｍｏｆＳｅｇｍｅｎｔｅｄＷｅｄｇｅＡｒｒａｙＵｓｉｎｇＰｈａｓｅ－ｄｉｓｔｕｒｂｅｄＰｌａｔｅ￥ＬＩＵＺｈｏｎｇｙｏｎｇ；ＺＨＥＮＧ...     

The Research of Scattering Cross-Section and Energy-Extraction in FEL

ＴｈｅＲｅｓｅａｒｃｈｏｆＳｃａｔｔｅｒｉｎｇＣｒｏｓｓ－ＳｅｃｔｉｏｎａｎｄＥｎｅｒｇｙ－ＥｘｔｒａｃｔｉｏｎｉｎＦＥＬＴｈｅＲｅｓｅａｒｃｈｏｆＳｃａｔｔｅｒｉｎｇＣｒｏｓｓ－ＳｅｃｔｉｏｎａｎｄＥｎｅｒｇｙ－ＥｘｔｒａｃｔｉｏｎｉｎＦＥＬ￥ＺＨ...     

DESIGN OF THE AIR—CORE TRANSFORMER IN SPHERICAL TOKAMAK

1　ＩｎｔｒｏｄｕｃｔｉｏｎＳｐｈｅｒｉｃａｌｔｏｋａｍａｋｈａｓｎｏｔｂｅｅｎｐａｉｄｍｕｃｈａｔｔｅｎｔｉｏｎｕｎｔｉｌＳＴＡＲＴ[1] ｓｕｃｃｅｓｓｆｕｌｌｙｏｐｅｒａｔｅｄ .Ｔｈｅｒｅａｒｅｔｗｏｕｎｐｒｅｄｉｃｔｅｄｆｅａｔｕｒｅｓｉｎｔｈｅｓｐｈｅｒｉｃａｌｔｏｋａｍａｋ.Ｆｉｒｓｔ,ｔｈｅｒｅｉｓｎａｔｕｒａｌｄｉｖｅｒｔｏｒｃｏｎｆｉｇｕｒａ ｔｉｏｎ .Ｓｅｃｏｎｄｌｙ ,ｔｈｅｒｅｉｓｎｏｍａｊｏｒｄｉｓｒｕｐｔｉｏｎｉｎｆｉｒｓｔ3 0 0 0 0ｏｈｍｉｃｄｉｓｃｈａｒｇｅｓ .Ｔｈｅｐｌａ…     

Interaction of the Light Field with N Atoms Possessing Dipole-dipole Interaction

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｉｎｔｈｅｆｉｅｌｄｏｆａｔｏｍｏｐｔｉｃｓ,ｂｒｅａｋｔｈｒｏｕｇｈｓｉｎｔｈｅｅｖａｐｏｒａｔｉｖｅｃｏｏｌｉｎｇｏｆｄｉｌｕｔｅａｌｋａｌｉｇａｓｅｓｈａｖｅａｌｌｏｗｅｄｔｈｅｇｅｎｅｒａｔｉｏｎｏｆＢｏｓｅ Ｅｉｎｓｔｅｉｎｃｏｎｄｅｎｓａｔｅｓ(ＢＥＣ) [1,2 ] .Ｓｉｎｃｅｔｈｅｎ ,ｔｈｅｒｅｈａｖｅｂｅｅｎｍａｎｙｉｎｔｅｒｅｓｔｓｉｎｃｒｅａｔｉｎｇａｎａｔｏｍｌａｓｅｒａｎｄｅｘｐｌｏｒｉｎｇｉｔｓｎｏｖｅｌｐｒｏｐｅｒｔｉｅｓ[3 ] .Ｔｈｅｆｉｒｓｔａ…     

Spectral Study of Fullerene Doped Optical Glasses

ＳｐｅｃｔｒａｌＳｔｕｄｙｏｆＦｕｌｌｅｒｅｎｅＤｏｐｅｄＯｐｔｉｃａｌＧｌａｓｓｅｓ￥ＭＥＮＧＺｈｉｃｏｎｇ；ＬＩＮＦｕｃｈｅｎｇ；ＭＡＯＳｅｎ；ＺＥＮＧＨｅｐｉｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃ...     

Imaging of rotating objects by means of synthesized optical holograms

A scheme is presented for producing optical holograms of rotating objects by illuminating the object by a single-frequency coherent laser beam. Along one axis, the synthesis takes place due to rotation of the object; along the other axis, the hologram is synthesized by the coherent radiation field generated by a long linear optical antenna. Numerical simulation shows that reliable discrimination of object images from the accompanying background is possible, for point objects, using a single hologram recorded at one angular position and, for extended flat objects or thin cylinder-like objects, using holograms recorded at two or three angular positions. If the holograms are synthesized in the presence of normally distributed random phase noise, the quality of the reconstructed images of rotating objects remains sufficiently high for root-mean-square noise amplitudes exceeding π/2 and reaching the limiting value 2π/3.     

The effect of nonlinearity of the recording media response on the properties of thick phase holograms

The effect of nonlinearity of a photosensitive medium response on the diffraction properties of thick phase holograms is analyzed on the basis of coupled-wave equations. It is shown that, for a typical dependence of the refractive index on the exposure, the response nonlinearity lowers the diffraction efficiency of a hologram illuminated by an s-polarized light. For the p polarization of the reading beam, the response nonlinearity reduces the hologram efficiency when the angle between the beams diffracted into the zero and second orders (into the minus first and first orders) is smaller than 90°, increases the efficiency for angles larger than 90°, and hardly affects the diffraction efficiency when this angle is close to 90°. The results for p polarization are obtained, to the best of our knowledge, for the first time. The analysis of angular selectivity of the gratings has shown that the effect of nonlinearity becomes particularly important for light waves incident on the hologram at angles close to the Bragg one. It is also found that, for any thickness of the photosensitive medium, there exists an optimum value of the maximum change in the refractive index, for which the diffraction efficiency may be close to 100% in a wide range of exposures. In this case, the nonlinearity for s polarization stabilizes, to some extent, the dependence of the diffraction efficiency on the exposure.     

Acceptable angle analysis of the planar wave-guided volume hologram

The planar wave-guided volume hologram (PWGVH) is recorded and reconstructed using light waves guided through optical substrates. In this paper, the variation of the diffracted light wave's central wavelength and wavelength range versus the angular deviation relative to the angle under Bragg condition was analyzed through numerical simulation. The study shows acceptable angular range with the high diffraction efficiency and color uniformity of unitary hologram is much less than the angular width. Multilayer volume holograms are designed to expand the acceptable angular range. The numerical simulation indicates that better color uniformity and wider acceptable angular range can be obtained.     

超短脉冲数字全息术中的立体角分复用技术

将角分复用技术应用于超短脉冲数字全息术，可实现对超快过程的动态记录.其中，在角分复用的设计中，由于CCD像素尺寸的限制，一般对物光和参考光的角度要求较为苛刻.为此，提出了一种立体角分复用的方法，并使用连续激光数字全息实验验证了这种方法的有效性.在此基础上，根据超短脉冲数字全息术记录超快过程的特点，设计了能够实现自动连续进行立体角分复用记录的光路.计算分析表明，该光路可在一帧数字全息图上连续记录间隔为纳秒量级的多幅超快过程的动态图像. 关键词： 超短脉冲数字全息术 立体角分复用 超快过程     

Multiplexed phase-conjugate holographic data storage with a buffer hologram

We describe and demonstrate a volume holographic storage system in which a phase-conjugate object beam is reconstructed by the same reference beam that was used for recording. An intermediate hologram is used as a temporary buffer, recorded with its own reference beam and the data-bearing object beam. Reading this buffer hologram with the phase conjugate of its reference beam reconstructs the phase conjugate of the object beam, which can then be recorded into the desired volume hologram for long-term storage. This method combines the immunity to lens aberrations provided by phase-conjugate readout with the simplicity of using the same multiplexed reference beam for both recording and readout. Only a single pair of phase-conjugate reference beams is required. Experimental results are shown with a single LiNbO(3):Fe crystal used as both buffer and storage holograms and a self-pumped phase-conjugate mirror in BaTiO(3) that provides the pair of phase-conjugate reference beams.     

A multichannel adaptive interferometry system

A multichannel adaptive interferometer based on dynamic reflecting holograms multiplexing in a photorefractive crystal of cubic symmetry is proposed. The efficiency of hologram multiplexing is studied theoretically and experimentally. For the recording geometry used, a crosstalk between channels is shown to be less than the single-channel inherent noise for a wide angular range of beams entering the crystal, and the sensitivity depletion in one channel is insignificant for a large number of channels.     

Characteristics of fourier phase holograms recorded on photopolymers

The results of the investigation of recording Fourier phase holograms on a self-developing photopolymer photosensitive in the range λ=400–515 nm are presented. It has been found that, due to the transient energy transfer between the beams, noise gratings are recorded, and a corresponding sharp reduction in the signal-to-noise ratio occurs, while the diffraction efficiency of the hologram as a whole remains relatively high (above 50%). It has been found that the noise-grating recording can be substantially suppressed by increasing the intensity of the reference beam relative to the intensity of the object beam. In this way, the signal-to-noise ratio has been considerably improved for Fourier holograms of binary phase masks: at a reference to object beam intensity ratio R=26, Fourier phase holograms are recorded with a diffraction efficiency η=15% and signal-to-noise ratio N=20 dB.     

Influence of light polarization on the diffraction efficiency of TIR holograms

Normally when forming a TIR hologram two interference gratings are stored in the recording medium. The object beam interferes with the incoming and with the reflected reference beam. An appropriate selection of the polarization orientations of the interfering light beams leads to the suppression of one of the grating systems. Even to reconstruct TIR hologram it is not all the same in which orientation the reconstructing laser beam is polarized. With the proper selection of the polarization orientations of the forming and reconstructing laser light the diffraction efficiency for TIR holograms can be optimized.     

Sequential hologram interferometry with diffusely illuminated objects

Two simple holographic multiplexing techniques for sequential hologram interferometry of a diffusely illuminated object are described. These techniques enable one to use the frozen-fringe hologram interferometry to study a quasi-continuous change in the object and so regain some of the advantages of real-time hologram interferometry. In the first method of multiplexing with a single reference beam, a small angle prism is used for varying the direction of the reference beam between successive exposures and a double-exposure hologram is recorded at each position of the prism. In the second method of multiplexing with multiple reference beams, a separate reference beam is used for recording each state of the object independently and the interference pattern between any two states is obtained by simultaneous reconstruction of two light fields. The advantage of this method over the previous one is that it is also suitable for dynamic studies. Some reconstructed interferograms of a diffusely illuminated transparent object under different stresses are presented as illustrations.     

转拍白光再现全息肖象的研究

本文介绍了我们在转拍白光再现的全息肖象方面的研究工作.讨论了拍摄工作中所需要特别注意的若干问题.如:参物光束比的选择、肖象尺寸大小的估算、视角的估算、获得高衍射效率的化学处理的方法、获得高信噪比的化学处理的方法等.