Some applications of the Murty interferometer: A review

Shukla, R. P.; Malacara, Daniel

doi:10.1016/0143-8166(95)00069-0

Cited by 30 publications

(5 citation statements)

References 45 publications

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“…The fringe signal detected at the image plane beyond grating G1 can be written as [16] Ix; y; t I 0 x; yf1 cosΔϕx; y δtg; (1) where I 0 x; y is the intensity bias, Δϕ is the phase difference as measured through the shearing interferometer, and δt is the time-varying phase shift.…”

Section: Resultsmentioning

confidence: 99%

“…It has been used extensively for a wide range of applications such as the measurement of refractive index, angle, and linear thermal expansion. A review article by Shukla and Malacara presented in detail several applications of the interferometer in testing systems and components [1]. In recent years, the technique has been applied to the measurement of vibration [2], temperature [3], distance [4], etc.…”

Section: Introductionmentioning

confidence: 99%

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Phase-shifting lateral shearing interferometry using wedge-plate and interferometric grating

2014

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A simple and robust method for introducing a phase-shifting test procedure in a wedge-plate shearing interferometer is proposed. The output of the wedge-plate lateral shearing interferometer (LSI) is superposed onto a sinusoidal grating, forming a moiré pattern. The in-plane translation of grating perpendicular to the grating lines is used for introducing a known amount of phase shifts in the interferometer. Direct measurement of phase using a four-step phase-shifting method is undertaken. The applicability of this devised phase-shifting wedge-plate LSI has been successfully tested for setting the collimation position of optical beams. Good accuracy and precision are achieved.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase-shifting lateral shearing interferometry using wedge-plate and interferometric grating

2014

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“…Although many interferometer configurations for producing laterally sheared wavefronts have been described, many of these only allow a visual inspection of wavefront gradient, e.g., the Murty plate interferometer [2,3]. Other designs, which allow the phase map to be recovered using phase stepping or other phase measurement techniques usually provide only accurate wavefront measurement with reasonably narrowband light.…”

Section: Introductionmentioning

confidence: 98%

Wavefront measurement with a phase-shifting lateral-shearing Sagnac interferometer operating in broadband light

Somervell

Barnes

2005

Optics and Lasers in Engineering

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“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] A transparent, parallel, or slightly wedged plate held obliquely to an incident beam works as an LSI. A wedged-plate LSI is more sensitive compared to a plane-parallel plate shearing interferometer because the shear fringes tend to align parallel to the shear direction with the increase in degree of collimation of the beam.…”

Section: Introductionmentioning

confidence: 99%

Noncontact thickness measurement of plane-parallel transparent plates with a lateral shearing interferometer

Chatterjee

2007

Opt. Eng

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A technique for determination of the thickness of a planeparallel transparent plate using a lateral shearing interferometer ͑LSI͒ is discussed. With this technique, the parallel plate whose thickness is to be determined is used to introduce a change in the collimation of the retro-reflected beam from an optical setup in which a corrected lens focuses an expanded collimated laser beam on the surface of a plane mirror placed at the back focal plane of the lens. The thickness of the plate is calculated by measuring the defocusing caused by the plate, which is inserted in the beam path between the collimating lens and the plane mirror, with an LSI. Results obtained for a parallel plate are presented. IntroductionAmong different collimation testing techniques, 1 the Lateral Shearing Interferometer ͑LSI͒ is widely used for testing the collimation of a laser beam. The LSI also has many useful applications in optical testing.Theory, different configurations, and applications of the LSI are available in the literature. 2-15 A transparent, parallel, or slightly wedged plate held obliquely to an incident beam works as an LSI. A wedged-plate LSI is more sensitive compared to a plane-parallel plate shearing interferometer because the shear fringes tend to align parallel to the shear direction with the increase in degree of collimation of the beam. A slight defocusing in the test beam results in the inclination of the shear fringes with respect to the shear direction. Techniques showing higher sensitivity in the testing of collimation have been reported. [4][5][6][7][8][9][10] Noncontact thickness measurement of transparent plates has been reported by researchers. 16,17 Their techniques require not only a sensitive detector but also a very high precision translation stage. Techniques related to surface profiling of transparent objects are available in literature. 18 In the present paper, we describe a noncontact technique for determining the thickness of a thin, plane-parallel, transparent plate using an LSI. In our technique, no translation of the optics is required during the measurement.

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Some applications of the Murty interferometer: A review

Cited by 30 publications

References 45 publications

Phase-shifting lateral shearing interferometry using wedge-plate and interferometric grating

Phase-shifting lateral shearing interferometry using wedge-plate and interferometric grating

Wavefront measurement with a phase-shifting lateral-shearing Sagnac interferometer operating in broadband light

Noncontact thickness measurement of plane-parallel transparent plates with a lateral shearing interferometer

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