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White light lateral shear interferometer with holographic shear lenses and spatial Fourier transform

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Abstract

Lateral shear interferometer is a simple yet powerful method for testing wavefronts or measuring refractive index changes. Previously, we have reported a method of using two holographic lenses to obtain shear and to generate a spatial frequency carrier, which was used for quantitative analysis. This technique has some advantages such as stability and instantaneous measurements. In this Letter, we report a method of using white light with holographic gratings to obtain shear and also to perform wavefront analysis using the spatial carrier fringes generated at a specific selected wavelength from the white light spectrum. We show that the sensitivity of the setup can be changed by selecting different wavelengths from the spectrum.

© 2013 Optical Society of America

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