An interferometry measure method on vibration spectrum of optical target based on cat-eye effect
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The spectral interference law for a Mach–Zehnder interferometer is derived and is used to illustrate spectral changes arising by interference between beams having different degrees of correlation. The results are compared with those pertaining to Young’s interference experiment. The use of this instrument to recover phase information is also investigated.
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Based on Taymans-Green's classic interference theory,a improved optical design was described.Compared with the classical theory of light interference,the new design scheme is not sensitive to environmental factors,and also has advantages in compact structure,high efficiency and a shared light path.After optimizing design of the standard plate and optical system,the extreme measuring precision of the system(PV)is better than 1/12λ(λ = 632.8 nm)in theory.A improved and portable interferometer was assembled and adjusted actually,and the comparison experiments with Mller phase shift interferometer was carried out.Experimental results show the measuring PV precision of assembed new interferometer is better than 1/10λ.
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We report an experimental demonstration of sub-wavelength interference without correlation. Typically, people can achieve sub-wavelength effect with correlation measurement no matter by using bi-photon or thermal light sources. Here we adopt a thermal light source. And we count the realizations in which the intensities of the definite symmetric points are above or below a certain threshold. The distribution of numbers of these realizations who satisfy the restriction will show a sub-wavelength effect. With proper constrictions, positive and negative interference patterns are demonstrated.
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This paper introduces a dual-path Mach-Zehnder interferometer for determining refractive index and geometrical thickness of an optical plate. In this interferometer, two parallel incident beams are separated into two interference pairs which are then recombined to generate two interference signals. An optical plate is placed on the path of one wave of an interference pair, so the phase difference of the interference signals is a function of the plate, and the interferometer is thus able to determine the index and thickness of the plate. A setup constructed to realize the proposed interferometer is described. And the experimental results of applying this setup agree the validity of the interferometer.
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An interferometer with off-axis and phase-shifting methods is developed to quantitatively measure complex amplitude distributions of fabricated metasurfaces. The developed interferometer switches between the off-axis and phase-shifting methods depending on the maximum spatial frequency components of a specimen metasurface. The off-axis method allows complex amplitude measurements from a single interference pattern and is robust to environmental vibrations, whereas the phase-shifting method can achieve high spatial resolutions via sequential recording of multiple interference patterns. We measured the complex amplitude distribution of fabricated metasurfaces using the developed interferometer. This interferometer would be useful for reducing design and fabrication errors and optimizing metasurface structures.
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Change of wavelength in interferometry modifies interferograms without any mechanical movement. If a series of interferograms are taken by successive change of wavelength and analyzed by computer, it brings a new technique called wavelength scanning interferometry. Two examples of such a technique are presented.
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Abstract We report an experimental demonstration of positive–negative sub-wavelength interference without correlation. Typically, people can achieve sub-wavelength effects with correlation measurement no matter by using bi-photon or thermal light sources. In this paper, we adopt a thermal light source, and we count the realizations in which the intensities of the definite symmetric points are above or below a certain threshold. The distribution of numbers of these realizations which meet the restriction will show a sub-wavelength effect. With proper constrictions, positive and negative interference patterns are demonstrated.
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Atmospheric sounding
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