Laser beam focusing through the scattering medium using bimorph deformable mirror and spatial light modulator

Ilya Galaktionov; Alexis Kudryashov; Julia Sheldakova; Alexander Nikitin

doi:10.1117/12.2533985

6 September 2019 Laser beam focusing through the scattering medium using bimorph deformable mirror and spatial light modulator

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, Alexander Nikitin

Author Affiliations +

Proceedings Volume 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019; 111350B (2019) https://doi.org/10.1117/12.2533985
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Bimorph deformable mirror with the clear aperture of 50 mm and 48 control electrodes and spatial light modulator with resolution of 1920x1080 pixels were used to increase the efficiency of focusing of partially coherent laser radiation, propagated through the 5 mm layer of the scattering suspension of 1 um polystyrene microspheres, diluted in distilled water, with the concentration values ranging from 10⁵ to 10⁶ mm-3. Medium with such parameters can be considered as an equivalent to the mid-dense fog layer with the length ranging from 300–500 meters up to 5 kilometers. Shack- Hartmann sensor was used to measure the distortions of averaged wavefront of laser beam, and CCD camera was used to estimate the intensity distribution of the focal spot in the far-field. Numerical and experimental investigation of the focusing improvement showed that it is possible to increase the peak intensity of the focal spot up to 45–60 %.

Conference Presentation

Citation Download Citation

Ilya Galaktionov, Alexis Kudryashov, Julia Sheldakova, and Alexander Nikitin "Laser beam focusing through the scattering medium using bimorph deformable mirror and spatial light modulator", Proc. SPIE 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019, 111350B (6 September 2019); https://doi.org/10.1117/12.2533985

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