3-D Phase Object Reconstruction Using Beam-Deflection Iterative Tomography

３－ＤＰｈａｓｅＯｂｊｅｃｔＲｅｃｏｎｓｔｒｕｃｔｉｏｎＵｓｉｎｇＢｅａｍ－ＤｅｆｌｅｃｔｉｏｎＩｔｅｒａｔｉｖｅＴｏｍｏｇｒａｐｈｙ￥ＧＡＯＹｉｑｉｎｇ（ＮａｎｃｈａｎｇＩｎｓｔｉｔｕｔｅｏｆＡｅｒｏｎａｕｔｉｃａｌＴｅｃｈｎｏｌｏｇｙ，Ｎａｎｃｈ...     

HMO in geometrical optics

ＨＭＯｉｎｇｅｏｍｅｔｒｉｃａｌｏｐｔｉｃｓ￥ＧＵＯＨｏｎｇ；ＬＩＮＴａｏ；ＷＡＮＧＧａｎｇ；ＺＨＡＮＧＹｕａｎｓｈｅｎｇ；ＤＥＮＧＸｉｍｉｎｇ（１．ＮａｆｉｏｎａｌＬａｂｏｒａｔｏｒｙｏｎＨｉｇｈＰｏｗｅｒＬａｓｅｒａｎｄＰｈｙｓｉｃｓ，Ｓｈａｎｇ...     

Temporal Aberration of the Focused Inhomogeneous Wave from a Misalignment Parallel Grating Pair Compressor

ＴｅｍｐｏｒａｌＡｂｅｒａｔｉｏｎｏｆｔｈｅＦｏｃｕｓｅｄＩｎｈｏｍｏｇｅｎｅｏｕｓＷａｖｅｆｒｏｍａＭｉｓａｌｉｇｎｍｅｎｔＰａｒａｌｅｌＧｒａｔｉｎｇＰａｉｒＣｏｍｐｒｅｓｏｒＸＵＳｈｉｘｉａｎｇＺＨＡＮＧＨｕａＦＡＮＤｉａｎｙｕａｎ（Ｓｈａｎｇ...     

Optical Realization of Comparison of Binary Patterns

ＯｐｔｉｃａｌＲｅａｌｉｚａｔｉｏｎｏｆＣｏｍｐａｒｉｓｏｎｏｆＢｉｎａｒｙＰａｔｔｅｒｎｓ￥ＨＥＹｏｎｇｒｏｎｇ；ＨＡＮＬｉａｎｇｋａｉ；ＺＨＯＵＪｉｎ；ＧＡＯＷｅｎｑｉ（Ｐｈｙｓｉｃｓｄｅｐａｒｍｅｎｔ，ＮａｎｊｉｎｇＵｎｉｖｅｒｓｉｔｙ，Ｎａｎ...     

Analysis of Fabrication Errors and Study of Calibration Method for Multilevel Diffractive Optical Element

ＡｎａｌｙｓｉｓｏｆＦａｂｒｉｃａｔｉｏｎＥｒｏｒｓａｎｄＳｔｕｄｙｏｆＣａｌｉｂｒａｔｉｏｎＭｅｔｈｏｄｆｏｒＭｕｌｔｉｌｅｖｅｌＤｉｆｒａｃｔｉｖｅＯｐｔｉｃａｌＥｌｅｍｅｎｔＦＵＹｏｎｇｑｉ（ＣｈａｎｇｃｈｕｎＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓ...     

Range and Line Resolved Brillouin Scattering in Pure Water Using Pulsed Nd：YAG Laser

ＲａｎｇｅａｎｄＬｉｎｅＲｅｓｏｌｖｅｄＢｒｉｌｌｏｕｉｎＳｃａｔｔｅｒｉｎｇｉｎＰｕｒｅＷａｔｅｒＵｓｉｎｇＰｕｌｓｅｄＮｄ：ＹＡＧＬａｓｅｒ￥ＬＩＵＤａｈｅ；ＱＵＡＮＸｉａｏｈｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＴｅｘａｓＡ＆ＭＵｎｉ...     

Resonant Fluorescence of a Λ-type Three-level Atom Driven by Microwave Field

ＲｅｓｏｎａｎｔＦｌｕｏｒｅｓｃｅｎｃｅｏｆａΛ┐ｔｙｐｅＴｈｒｅｅ┐ｌｅｖｅｌＡｔｏｍＤｒｉｖｅｎｂｙＭｉｃｒｏｗａｖｅＦｉｅｌｄＣＡＯＺｈｕｏｌｉａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＡｎｈｕｉＵｎｉｖｅｒｓｉｔｙ，Ｈｅｆｅｉ２３００３...     

Operative Characteristics of the Dual-wavelength Cr: LiSAF Laser

ＯｐｅｒａｔｉｖｅＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｔｈｅＤｕａｌ┐ｗａｖｅｌｅｎｇｔｈＣｒＬｉＳＡＦＬａｓｅｒＬＩＵＧｕｏｒｏｎｇＷＡＮＧＮｕｏＦＥＮＧＸｕａｎｑｉ（ＰｈｙｓｉｃｓＤｅｐａｒｔｍｅｎｔ，ＮｏｒｔｈｗｅｓｔＵｎｉｖｅｒｓｉｔｙ，Ｘｉ?..     

Photoluminescence quenching of porous silicon by noble metal adsorbates

Ｐｈｏｔｏｌｕｍｉｎｅｓｃｅｎｃｅ ｑｕｅｎｃｈｉｎｇ ｏｆ ｐｏｒｏｕｓ ｓｉｌｉｃｏｎ ｂｙ ｎｏｂｌｅ ｍｅｔａｌ ａｄｓｏｒｂａｔｅｓ￥ＧＵＯＨｅｎｇｑｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓ，ＨｕａｑｉａｏＵｎｉｙｅｒｓｉ...     

Saturable Excited State Absorption of Cr~(4 ) : YAG for Q-switching Nd : YAG Laser

ＳａｔｕｒａｂｌｅＥｘｃｉｔｅｄＳｔａｔｅＡｂｓｏｒｐｔｉｏｎｏｆＣｒ４＋ＹＡＧｆｏｒＱ┐ｓｗｉｔｃｈｉｎｇＮｄＹＡＧＬａｓｅｒＷＡＮＸｉａｏｋｅＬＩＮＬｉｈｕａｎｇＯＵＹＡＮＧＢｉｎＤＩＮＧＹａｎｈｕａＸＵＪｕｎＤＥＮＧＰｅｉｚｈｅｎ（Ｓｈａｎｇ...     

Automatic refractive index profiling of fibers by phase analysis method using Fourier transform

Automatic fringe pattern analysis is a powerful and inexpensive digital image-processing technique. It is used to analyze the fringe pattern obtained by different optical techniques, such as multiple-beam Fizeau fringes. To perform accurate and fast automatic measurement of fiber refractive index profile, phase analysis method has been used with the Fourier transform technique. In this paper, the refractive index profiles of polyethylene fibers with different draw ratios are presented by two methods, fringe shift method and phase analysis method. A comparison between the results obtained is presented.     

折射率介质在制栅和云纹干涉法中的应用

利用光在折射率介质中传播可以减小光波波长的性质，提出用折射率介质法制作高频全息光栅技术，使光栅频率突破理论极限２／λ；并将折射率介质应用于云纹干涉法中，当试件栅频率为６００１／ｍｍ时，虚栅频率可达到６０００１／ｍｍ，利用其±５级衍射光进行干涉，测量灵敏度由０．８３μｍ提高到０．１６μｍ。     

移相器微位移旋转误差的分析及测试

以压电陶瓷(PZT)微位移器为主要研究对象, 引入一种处理静态干涉图的新方法--虚光栅移相叠栅条纹法,设计实验对一台实际使用的移相器微位移旋转误差进行测试研究,对其引起的波面旋转情况进行了定量的计算分析,并给出测试结果.用虚光栅移相叠栅条纹法处理实验中加有载频的干涉图时,不需要使用任何移相器件,可以进行动态位相的检测,整个移相过程用计算机进行控制,避免了引入额外的移相误差.     

Identifying a dot-matrix hologram with the fringe-overlapping phenomena of grating dots

Dot-matrix holograms created by two-beam writers contain many grating dots. Because the phase difference between two laser beams for interference cannot be controlled accurately, the fringe positions of grating dots are randomly determined. Therefore, fringe positions are a good kind of tool to identify dot-matrix holograms. In this paper, a number difference between two special fringes of a target grating dot is used to identify a dot-matrix hologram. The two special fringes are determined by three grating dots with parallel fringes. The first special fringe is corresponding to a fringe pair with the best matching for the fringes of the target grating dot and the fringes of the second grating dot. The second special fringe is corresponding to a fringe pair with the best matching for the fringes of the target grating dot and the fringes of the third grating dot. An experiment has proved the proposed method practical and feasible. Because reproducing a grating dot with a specified fringe number difference is difficult, the proposed method is excellent for anti-counterfeiting.     

双计算机光栅莫尔拓扑术

提出了利用双计算机光栅实现莫尔拓扑检测的方法.理论分析表明,投影光栅核的横向偏导数为常数是实现灵敏度均匀性检测的必要条件.适当设计光栅核,就可用等间距直条纹来表征标准面形.被测实物面形的缺陷就可通过莫尔条纹相对于背景直条纹的偏移而定量且直观地反应出来.最后,以轮胎镜为例进行了计算机模拟和实验验证.     

莫尔条纹法测量微小旋转角度的频域分析

利用菲涅耳衍射的频域分析方法,对莫尔条纹复振幅分布公式进行了理论推导,得到了使用两块相同光栅组成的光栅付测量微小角度的原理公式,与利用几何光学等方法得到的结论一致.模拟结果表明：莫尔条纹是光栅付拍现象的最低频率含量,莫尔条纹内含有大量高次谐波|在探测器光学系统放大率一定的前提下,为通过直接测量莫尔条纹宽度的变化达到测量角度变化的目的,必须根据测角精度、探测器的尺寸和分辨率选择合适的光栅付光栅常数和光栅付初始夹角.     

High-speed fringe analysis by using stair-shaped virtual grating demodulation

This article describes a novel fringe analysis technique using stair-shaped virtual grating demodulation algorithm for extracting the phase information from a single fringe pattern. In contrast to the Fourier transform technique and quadrature multiplicative moire method, the new method processes a fringe pattern in the integer signal domain instead of the frequency domain and real-signal domain. The spatial carrier of fringe image is not limited to any particular frequency as long as it fulfills the sampling theorem. The errors analysis of this technique is conducted by computer simulation and experiments.     

Measurement of a transparent object by using an automated Talbot interferometer

It is reported that the first partial derivative of the phase distribution for a transparent object can be measured automatically by a personal computer with an image processor. The moire pattern is formed by superimposing the Fourier image distorted by the transparent object on the master grating. But if only the moire patterns are observed, it is not shown if the fringe order numbers increase or decrease. The fringe scanning method is presented to overcome the fringe order numbers. The four-step method is used to calculate the first partial derivative. By a simple experiment, the first partial derivative can be shown in the three dimensional graphics.     

Liquid refraction and dispersion measurements by multiple-beam white-light Newton's fringes

Multiple-beam white-light Newton's fringes in transmission are produced in a Newton's interferometer containing a liquid sample and followed with a grating spectrograph. An equation describing the shape of the formed interference fringes is derived. A simple procedure is introduced for analyzing the resulting interference fringes. This enables the determination of both: the liquid refractive index, the fringe order of interference and the thickness at the point of contact. Errors of the measured liquid refractive index are discussed. The method is used for measuring the refraction and dispersion of glycerin, dimethylformamide (DMF) and water across the visible spectrum. The method is a single-shot, static, material-economic and low-cost interferometric one.     

自由立体显示器中锯齿状交错狭缝光栅的设计

光栅式自由立体显示由于易存在莫尔条纹和串扰的问题而影响其显示效果.利用斜光栅可减轻莫尔条纹但增加了视点间的串扰.本文提出一种减轻莫尔条纹的光栅设计方法,同时对可视区域影响较小.设计中对光栅进行分段,并将相邻两段狭缝错开一定距离.该方法能减小通过同一狭缝看到两相邻子像素之间的黑条的比例,获得较宽且较淡的莫尔条纹,从而减轻了视觉干扰.仿真结果表明该光栅相比传统垂直光栅,莫尔条纹亮度下降了108.1％,而可视区域仅减小32.8％,具有较高的实用价值.