20 February 2017 The use of modified hill-climbing algorithm for laser beam focusing through the turbid medium
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Abstract
We investigate the ability to focus the laser beam (λ=0.65μm) propagated through the scattering suspension of polystyrene microspheres in distilled water by means of bimorph deformable mirror. Shack-Hartmann sensor was used to measure the local slopes of the Poynting vector, while the CCD camera was used to measure the intensity of the focal spot in the farfield. Bimorph deformable mirror with 14 electrodes was applied in order to increase the intensity of the focal spot in the far-field. We investigated the efficiency of the laser beam focusing improvement by means of three techniques: LSQ fiterror minimization by Shack-Hartmann sensor, Hill-climbing optimization by Shack-Hartmann sensor and Hill-climbing optimization by far-field CCD camera.
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Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Alexander Nikitin, "The use of modified hill-climbing algorithm for laser beam focusing through the turbid medium", Proc. SPIE 10090, Laser Resonators, Microresonators, and Beam Control XIX, 100901K (20 February 2017); doi: 10.1117/12.2257447; https://doi.org/10.1117/12.2257447
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