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Proceedings ArticleDOI

Birefringence Analysis Using Mach-Zehnder Interferometer

15 Jun 2015-Vol. 9654, pp 965422
TL;DR: In this article, a theory for interferometric analysis of an arbitrarily oriented birefringent sample is developed, where the object is placed in one of the arms of a Mach-Zehnder Interferometer.
Abstract: The theory for interferometric analysis of an arbitrarily oriented birefringent sample is developed. The object is placed in one of the arms of a Mach-Zehnder Interferometer. Interferograms are recorded for vertically and horizontally polarized light passing through the sample. The spatial phase information for these two cases is suitably combined through an algorithm developed for this purpose to yield the complete spatial distribution of retardance and direction of birefringence over the sample plane. The proposed method is able to measure spatial variations of birefringence from 0 to π and is targeted to measurement of low birefringence as in biological specimens. Simulation results presented validate the proposed theory. Experimental results are forthcoming.
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Journal ArticleDOI
15 Feb 2021
TL;DR: In this paper, the relationship of local birefringence and stress oriented inhomogeneous elasticity of a sample from the spatial frequency response of focused surface plasmon (FSP) was studied.
Abstract: In this paper, we study the relationship of local birefringence and stress oriented inhomogeneous elasticity of a sample from the spatial frequency response of focused surface plasmon (FSP). The birefringence of the sample varies the propagation constant of surface plasmon with regard to its direction and produces an elliptic absorption pattern in the reflected spatial frequency distribution. Birefringence is calculated from the ratio of the propagation constant along the fast to slow axis of the sample. The change in eccentricity was proportional to the applied stress on cellophane film. A strong correlation (0.94∼0.97) exists between FSP and phase shifting interferometry results.

5 citations


Cites background from "Birefringence Analysis Using Mach-Z..."

  • ...However, determination of spatially varying retardance calls for special techniques [18,19,20]....

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References
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Journal ArticleDOI
TL;DR: A full-field technique for simultaneous measurement of the magnitude of birefringence and its orientation is presented using a monolithic bireFringence sensitive interferometer where the interference fringes carry the information of both the biretringence phase and the orientation of the fast axis of an optically transmissive anisotropic material placed at the output of the interferometers.
Abstract: A full-field technique for simultaneous measurement of the magnitude of birefringence and its orientation is presented. This is achieved using a monolithic birefringence sensitive interferometer where the interference fringes carry the information of both the birefringence phase and the orientation of the fast axis of an optically transmissive anisotropic material placed at the output of the interferometer. The interferometer consists of a suitably polarization-masked cube beam splitter, orientated as in the Gates interferometer, which serves to generate a pair of orthogonally polarized and collinearly propagating light beams. Experimental results are obtained through an algorithm incorporating eight polarization phase-shifted interferograms.

12 citations


Additional excerpts

  • ...x y δ δ φ θ δ δ φ θ θ + = − − (6) With the input polarizer P(θ) oriented at θ = 45о, this reduces to: cos( / 2)cos sin( / 2)cos(2 ) cos( / 2)sin sin( / 2)sin(2 ) i i δ θ δ φ θ μ δ θ δ φ θ + −   =   + −  ...

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Journal ArticleDOI
TL;DR: In this article, an interferometric technique for photoelastic testing of small and transparent samples is proposed by the introduction of two properly oriented polarisers in the two arms of a Twyman-Green interferometer.

10 citations


Additional excerpts

  • ...(4) & (5), [ ] [ ] tan tan (2sin(2 ) / sin 2 tan tan (2cos(2 2 ) / sin 2 x y...

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  • ...(2) and (3) we have, [ ][ ] [ ][ ] tan tan tan( / 2) (cos(2 ) / cos ) (sin(2 ) / sin ) tan( / 2) (2 sin(2 ) / sin 2 x y δ δ δ φ θ θ φ θ θ δ φ θ + = − + − = (4)...

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