Mr. Bruno Saucedo Profile

Bruno Saucedo

at Ctr de Investigaciones en Optica

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Proceedings Article | 20 August 2020 Poster + Paper

Wavelength detection method using vortices

B. Saucedo, A. Dávila, J. A. Rayas

Proceedings Volume 11488, 114880Q (2020) https://doi.org/10.1117/12.2568686

KEYWORDS: Speckle, Spectroscopy, Fourier transforms, Light scattering, Digital holography, CCD cameras, Glasses, Tunable lasers, Speckle pattern

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An optical system is proposed for wavelength measurement and detection using phase vortices produced by an integrating glass disc. This optical system is based on a modified digital holographic configuration used previously for measurement in Particle Image Velocimetry (PIV) but adapted here for the detection of phase vortices generated by an integrating glass disc. Phase vortices are detected from speckle patterns that are produced using a tunable light with a wavelength of 632 ± 2 nm emitted by a Littrow monolithic tunable external cavity laser, and after multiple reflections in the integrating disc combined with a reference beam and a speckle interferogram is obtained that recorded by a CCD camera. The Fourier transform method is used for speckle phase generated in the proposed optical configuration and analyzed with a vortex detection method that produces a singularities pattern for each wavelength.

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