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3 March 2015 Characterization of vorticity in fluids by a spatially shaped laser beam
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Abstract
Measuring the speed and direction of vortices is of great importance in fluid dynamics. We report on the use of a CW laser beam with a superposition of Laguerre-Gaussian (LG) modes generated by a phase mask imprinted on a two-dimensional spatial light modulator. The shaped beam is then guided and scattered of a sample which is rotated; the rotational frequency is extracted from spectral analysis of the scattered light. This method allows for virtually real-time determination of vorticity characterization in a fluid.
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Anton Ryabtsev, Shahram Pouya, Manoochehr Koochesfahani, and Marcos Dantus "Characterization of vorticity in fluids by a spatially shaped laser beam", Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 93431G (3 March 2015); doi: 10.1117/12.2080238; https://doi.org/10.1117/12.2080238
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