Temporal statistics of synced optical phase and intensity measurements through Rayleigh Bénard turbulence

Nathaniel A. Ferlic; Svetlana Avramov-Zamurovic; Owen O'Malley; Linda J. Mullen; K. Peter Judd

doi:10.1117/12.2675760

3 October 2023 Temporal statistics of synced optical phase and intensity measurements through Rayleigh Bénard turbulence

Nathaniel A. Ferlic, Svetlana Avramov-Zamurovic, Owen O'Malley, Linda J. Mullen, K. Peter Judd

Author Affiliations +

Proceedings Volume 12691, Laser Communication and Propagation through the Atmosphere and Oceans XII; 126910M (2023) https://doi.org/10.1117/12.2675760
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

Optical applications, such as imaging, communications, and sensing, can be severely limited by the effects of oceanic turbulence when the water is free of particulate matter. To study this phenomenon in a controlled environment, a Rayleigh B`enard tank, housed at the U.S. Naval Academy, was used to study heat driven convective turbulence in a systemic manner. A Gaussian laser beam was characterized though synchronized phase and intensity measurements obtained by a Shack-Hartmann wavefront sensor and high-speed camera, respectively. The beam’s instantaneous intensity and phase measurements were analyzed in space and time, and the synchronicity between the wavefront sensor and camera allows for the temporal statistics to be directly compared. Phase time series were analyzed to obtain an ensemble averaged power spectrum that was fit to a bounded Kolmogorov model. Wavelet analysis was leveraged to process the turbulence frequency rates at weak and moderate turbulence levels. Estimates for the turbulence turnover rates were obtained from the temporal statistics. Upon applying the same methods to the intensity time series, the statistics appeared subtly different compared to the phase statistics. It was shown within the wavefront frequency statistics that features changed on the time scale of seconds. However, intensity features changed on timescales of seconds to a tenth of a second.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nathaniel A. Ferlic, Svetlana Avramov-Zamurovic, Owen O'Malley, Linda J. Mullen, and K. Peter Judd "Temporal statistics of synced optical phase and intensity measurements through Rayleigh Bénard turbulence", Proc. SPIE 12691, Laser Communication and Propagation through the Atmosphere and Oceans XII, 126910M (3 October 2023); https://doi.org/10.1117/12.2675760

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