Ranging through turbid underwater using structured optical beams

Huibin Zhou; Yuxiang Duan; Hao Song; Zile Jiang; Muralekrishnan Ramakrishnan; Xinzhou Su; Robert Bock; Moshe Tur; Alan E. Willner

doi:10.1117/12.3017230

6 June 2024 Ranging through turbid underwater using structured optical beams

Huibin Zhou, Yuxiang Duan, Hao Song, Zile Jiang, Muralekrishnan Ramakrishnan, Xinzhou Su, Robert Bock, Moshe Tur, Alan E. Willner

Author Affiliations +

Proceedings Volume 13061, Ocean Sensing and Monitoring XVI; 1306109 (2024) https://doi.org/10.1117/12.3017230
Event: SPIE Defense + Commercial Sensing, 2024, National Harbor, Maryland, United States

Abstract

We demonstrate optical ranging through turbid underwater medium using a structured beam. This beam consists of two Bessel modes, each carrying a pair of orbital angular momentum order and longitudinal wavenumber. As a result, the beam has a “petal-like” intensity profile with different rotation angles at different distances. The object’s distance (z) is retrieved by measuring the rotation angle of the petal-like profile of the back-reflected beam. We demonstrate ⪅ 20-mm ranging errors through scattering with extinction coefficient γ up to 9.4 m^-1 from z = 0 to 0.4 m. We further experimentally demonstrate the enhancement of ranging accuracy using multiple (⪆2) Bessel modes. With the number of modes increasing from two to eight, the average error decreases from approximately 16 mm to approximately 3 mm for a Υ of 5 m^-1. Moreover, we simulate both coarse- and fine-ranging by using two different structured beams. One beam has a slower rotating petal-like profile, leading to a 4X larger dynamic range for coarse ranging. A second beam has a faster rotating profile, resulting in higher accuracy for fine ranging. In our simulation, ⪅ 7-mm errors over a 2-m dynamic range are achieved under 𝛾 = 4 m^-1 .

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Citation Download Citation

Huibin Zhou, Yuxiang Duan, Hao Song, Zile Jiang, Muralekrishnan Ramakrishnan, Xinzhou Su, Robert Bock, Moshe Tur, and Alan E. Willner "Ranging through turbid underwater using structured optical beams", Proc. SPIE 13061, Ocean Sensing and Monitoring XVI, 1306109 (6 June 2024); https://doi.org/10.1117/12.3017230

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