迈克尔逊干涉仪中补偿板与干涉条纹

通过分析缺失补偿板的迈克尔逊干涉仪中的附加光程差,推出干涉条纹满足的方程式,并用计算机模拟了动镜移动过程中变化的干涉条纹,与实验结果相一致.     

迈克尔逊干涉仪干涉条纹变形的快速校正

本介绍了快速校正迈克尔逊干涉仪干涉条纹变形的两种方法。     

迈克尔逊干涉仪所产生的非定域干涉条纹

一般光学教科书讨论迈克尔逊干涉仪(下面简称M干涉仪)所产生的干涉条纹时,往往研究面光源照明下的等厚、等倾干涉条纹。激光的出现,使我们有可能得到一个强点光源以观察M干涉仪的非定域干涉条纹。这在Hecht和Zajac所著Optics一书中曾提到。近几年,我们在普物光学的M干涉仪     

迈克尔逊干涉仪等倾干涉条纹法测液体折射率

介绍一种用迈克尔逊干涉仪等倾干涉条纹测定液体折射率的方法。实验证明 ,此方法是正确、有效和简便的。     

迈克尔逊干涉仪干涉条纹不稳定原因及改进措施

现有迈克尔逊干涉仪产生的干涉条纹容易抖动,使实验结果产生较大误差,甚至影响实验正常进行。探寻干涉条纹抖动主要原因,改进仪器结构和增加减振装置,提高原有仪器的抗振动干扰性能,使干涉条纹稳定性提高。     

迈克尔逊干涉仪上演示杨氏干涉

杨氏于1801年用单强光照射开有小孔S的光阑,在小孔S后面再放置一个开有两个小孔S1和S2的光阑,就完成了具有重大历史意义的杨氏干涉实验．后来,小孔S和S1及S2逐渐在杨氏实验装置中,如图1,S1和S2是两个相干点光源,必须足够小．否则,     

迈克尔逊干涉仪的干涉花样及调节

本较详细地讨论了迈克迩干涉仪在各种不同条件下产生的干涉条纹的性质及干涉花样。     

迈克尔逊干涉仪实验中最佳间隔条纹个数的探讨

用迈克尔逊干涉仪可以测量激光的波长,读取的干涉条纹个数较多时容易引起学生视力的疲劳。因此,本文测量了多组不同的间隔条纹个数时氦氖激光的波长,进而确定它们与波长理论值之间的误差大小,通过比较不同间隔条纹个数时百分差和相对不确定度的大小,最终确定最佳的间隔条纹个数。     

迈克尔逊干涉仪椭圆干涉图样成因分析

迈克尔逊干涉仪的非定域干涉图样通常是明暗相间的同心圆环．点光源产生的非定域干涉，如图1．激光束通过短焦距透镜会聚成一强度很高的点光源．S，S发出的球面波经分光板G1及经平面镜M1和M2反射，     

迈克耳孙干涉条纹细分和计数

当两相干光附加一按固定频率变化的相位差时,其干涉条纹的光强将随之交变,即为相位调制干涉,用相敏检波等电信号处理手段,可实现这种干涉条纹高精度、高稳定性的计数和细分。     

Speckle pattern interferometer

We describe in this paper a speckle interferometer constituted by two partially diffusing plates. They are illuminated by a laser and the resulting intensity distribution is observed in the image plane of the source. Each speckle of this plane (Fourier plane) is modulated by a ring system whose interference order depends on its phase. Since the observation plane is a Fourier plane, a longitudinal or lateral shift of one of the diffusers results only into a change of the modulating fringes, the speckles themselves remaining unchanged. A photographic plate which records successively the intensity distribution lying in the Fourier plane before and after the considered shift, exhibits after processing a system of Moiré fringes, the shape of which depends on the nature of the translation given to the diffuser between the exposures.     

Fringe pattern analysis by S-transform

S-transform proposed in 1996 by Stockwell R.G is a simple and popular technique for the time–frequency analysis. It has been introduced in optical three-dimensional shape measurement, recently. In this paper, a study about applications of S-transform in the demodulation of deformed fringe patterns is performed. We focus on discussing not only the S-transform spectrum filtering technique, the S-transform ridge technique and the phase gradient calculation method based on S-transform used in fringe pattern demodulation, but also the phase unwrapping technique. In addition, a generalized S-transform was introduced to analyze fringe patterns, which is helpful to improve the measurement accuracy and flexibility of the method based on S-transform. The reconstruction results based on S-transform were compared with that on wavelet transform and windowed Fourier transform in fringe analysis.     

Fringe pattern denoising via image decomposition

Filtering off noise from a fringe pattern is one of the key tasks in optical interferometry. In this Letter, using some suitable function spaces to model different components of a fringe pattern, we propose a new fringe pattern denoising method based on image decomposition. In our method, a fringe image is divided into three parts: low-frequency fringe, high-frequency fringe, and noise, which are processed in different spaces. An adaptive threshold in wavelet shrinkage involved in this algorithm improves its denoising performance. Simulation and experimental results show that our algorithm obtains smooth and clean fringes with different frequencies while preserving fringe features effectively.     

Fringe pattern correlator for three-dimensional object recognition

We propose a novel three-dimensional (3-D) object-recognition method based on a Fourier-transform profilometry technique and a two-dimensional (2-D) correlation technique. Height information on 3-D objects is transformed to phase information on 2-D complex amplitude by use of the Fourier-transform profilometry technique. 3-D objects are recognized using correlation by use of the transformed complex amplitude.     

Fringe visibility and distinguishability in two-path interferometer with an asymmetric beam splitter

We study the fringe visibility and the distinguishability of a general Mach-Zehnder interferometer with an asymmetric beam splitter. Both the fringe visibility V and the distinguishability D are affected by the input state of the particle characterized by the Bloch vector S =(S_x, S_y, S_z) and the second asymmetric beam splitter characterized by the paramterβ. For the total system is initially in a pure state, it is found that the fringe visibility reaches the upper bound and the distinguishability reaches the lower bound when cosβ=-S_x, The fringe visibility obtain the maximum only if S_x = 0 and β = π/2 when the input particle is initially in a mixed state. The complementary relationship V~2 +D~2 ≤ 1 is proved in a general Mach-Zehnder interferometer with an asymmetric beam splitter, and the conditions for the equality are also presented.     

Fringe visibility and correlation in Mach-Zehnder interferometer with an asymmetric beam splitter

We study the wave-particle duality in a general Mach-Zehnder interferometer with an asymmetric beam splitter from the viewpoint of quantum information theory. The correlations (including the classical correlation and the quantum correlation) between the particle and the which-path detector are derived when they are in pure state or mixed state at the output of Mach-Zehnder interferometer. It is found that the fringe visibility and the correlations are effected by the asymmetric beam splitter and the input state of the particle. The complementary relations between the fringe visibility and the correlations are also presented.     

Flat-top interleavers with chromatic dispersion compensator based on phase dispersive free space Mach-Zehnder interferometer

In this paper, novel interleavers using circular cavities (CC) in a Mach-Zehnder interferometer (MZI) has been presented and demonstrated for the first time, in which CCs act as phase dispersive mirrors which exhibit a periodic dependence on the frequency of light. Three implementation schemes have been proposed and investigated. Theoretical analysis shows the spectral characteristics of each scheme in a 50-GHz channel spacing application. Furthermore, the chromatic dispersion (CD) of each output comb can be flattened within passband by appending an additional CC. The result shows that the proposed designs with novel interferometer technique can simultaneously provide flat top passbands, high isolation stopband and low CD value as well.     

A new type of precision ellipsometer without employing a compensator

The apparatus is designed for ellipsometry based on the measurement of the principal angle of incidence. It is of the return-path type, somewhat like the Littrow-type spectrometer, requiring only one polarizer and no compensator.