Analysis of laboratory turbulence by spectral methods

Alexey L. Rukosuev; Vadim N. Belousov; Alexander N. Nikitin; Julia V. Sheldakova; Alexis V. Kudryashov

doi:10.1117/12.2603463

15 December 2021 Analysis of laboratory turbulence by spectral methods

Alexey L. Rukosuev, Vadim N. Belousov, Alexander N. Nikitin, Julia V. Sheldakova, Alexis V. Kudryashov

Proceedings Volume 11916, 27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics; 119161H (2021) https://doi.org/10.1117/12.2603463
Event: 27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2021, Moscow, Russian Federation

Abstract

The results of experiments carried out on the setup of a fast adaptive optical system are presented. A fan heater was used as a source of wavefront aberrations, the air flow of which was directed perpendicular to the laser beam. The processing of the experimental data consisted in determining the spectral characteristics of the disturbing effect from the dynamics of oscillations of the coordinates of the focal point of the lens array. To ensure sufficient resolution in the frequency domain, a sample of the original data was recorded for 10 s, which provided a resolution along the frequency axis of 1/10 Hz. The graphs of the spectral energy for the full set of wavefront aberrations calculated from the fluctuations of the lens array focal spot are shown. For a more detailed consideration, the wavefront aberrations were expanded in terms of Zernike polynomials, after which a spectral analysis of each aberration was carried out. It is shown that more than 90% of all turbulence energy is concentrated in lower-order aberrations, which makes it possible to use a bimorph mirror as a wavefront corrector, which reproduces well the lower-order aberrations.

Citation Download Citation

Alexey L. Rukosuev, Vadim N. Belousov, Alexander N. Nikitin, Julia V. Sheldakova, and Alexis V. Kudryashov "Analysis of laboratory turbulence by spectral methods", Proc. SPIE 11916, 27th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 119161H (15 December 2021); https://doi.org/10.1117/12.2603463

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