Simple phase-shifting lateral shearing interferometer
نویسندگان
چکیده
منابع مشابه
A Simple Phase-Shifting Lateral Shearing Interferometer
A phase-shifting electronic speckle pattern shearing interferometer with a very simple shearing device is proposed. Two partially reflective glass plates are used to introduce the shear in this new interferometer. The reflection coefficients of the coatings were 0.3 and 0.7 respectively. The distance between the two glass plates controls the size of the shear. The proposed new interferometric s...
متن کاملComment on "Phase-shifting shearing interferometer".
The role of the liquid-crystal layer in the phase-shifting shearing interferometer that was proposed by Griffin [Opt. Lett. 26, 140 (2001)] is analyzed. An extra voltage-dependent phase difference is produced when the phase retarder is oriented at an angle from the optical axis of the laser beam such that the interferogram will not repeat itself after a 2pi phase change of the liquid-crystal re...
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In this Letter, a collimated light acoustooptic lateral shearing interferometer (AO/LSI) capable of variable shear is described for use with either visual or ac electronic real-time phase measurements. The principle of operation of the AO/LSI is shown in Figs. 1 and 2. An input beam of diameter W is incident at Bragg’s angle upon two acoustooptic modulators (AOM’s) in series. They are shown sch...
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The advantages of common path interferometers for reducing effects of vibrations are well known. A scatterplate interferometer is one common-path interferometer that is well suited for the testing of large concave mirrors, however due to the common path characteristics it is difficult to perform phase-shifting. This paper describes a phase-shifting scatterplate interferometer where the phase-sh...
متن کاملPhase-shifting point diffraction interferometer.
We describe a novel interferometer design suitable for highly accurate measurement of wave-front aberrations over a wide range of wavelengths, from visible to x ray. The new design, based on the point diffraction interferometer, preserves the advantages of the conventional point diffraction interferometer but offers higher efficiency and improved accuracy through phase shifting. These qualities...
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ژورنال
عنوان ژورنال: Optics Letters
سال: 2004
ISSN: 0146-9592,1539-4794
DOI: 10.1364/ol.29.001264