Abstract
In this research we implemented a two-step phase shifting system based on two cyclic-path coupled interferometers for slope measurements of transparent samples. The optical system generates two π-shifted interferograms, and the phase shift between interferograms is obtained by rotating a linear polarizer, generating four interferograms with relative π/2-phase shifts; this simplifies the number of phase steps necessary to retrieve the optical phase, since is only necessary perform a shift operating a linear polarizer. The optical phase was processed by a four-step algorithm. In order to present the capabilities of the system, results obtained for slope for transparent structures are presented.
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Acknowledgments
This research was supported by the Technological University of Tulancingo, according to The Initiative for the creation of the First Optics and Photonics Engineering undergraduate program in Mexico. Authors thank M. A. Ruiz for his contribution in proofreading the manuscript. Author V. H. Flores Muñoz is grateful to CONACYT for the scholarship provided (Grant. 224506) and Programa para el Desarrollo Profesional Docente (PRODEP) for grant UPBIC-PTC-022.
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Lechuga, L.G., Toto-Arellano, N.I., Flores Muñoz, V.H., Martínez-García, A., Zurita, G.R. (2017). Phase Shifting Interferometry Using a Coupled Cyclic Path Interferometers. In: Martínez-García, A., Furlong, C., Barrientos, B., Pryputniewicz, R. (eds) Emerging Challenges for Experimental Mechanics in Energy and Environmental Applications, Proceedings of the 5th International Symposium on Experimental Mechanics and 9th Symposium on Optics in Industry (ISEM-SOI), 2015. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-28513-9_9
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