Dr. Nadav Cohen Profile

Dr. Nadav Cohen

at Israel Ministry of Defense

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Proceedings Article | 10 September 2019 Presentation

Experimental demonstration of object identification by analyzing 2-dimensional complex spectra of Laguerre-Gaussian modes (Conference Presentation)

Jing Du, Zhe Zhao, Runzhou Zhang, Guodong Xie, Long Li, Haoqian Song, Kai Pang, Cong Liu, Hao Song, Ahmed Almaiman, Shlomo Zach, Nadav Cohen, Moshe Tur, Alan Willner

Proceedings Volume 11135, 111350K (2019) https://doi.org/10.1117/12.2531401

KEYWORDS: Laser beam diagnostics, Shape analysis, Beam shaping, Phase shifts

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We recover the shape and orientation of an object by analyzing the spatial phase and amplitude of a transmitted optical beam using a single pixel. We experimentally demonstrate using the complex spatial spectrum of multiple sequential measurements of a varying probe beam. Specifically, we transmit a structured beam that is tailored to have one mode of the Laguerre-Gaussian (LG) modal basis set, and the beam is varied to sequentially have a unique azimuthal (l) and radial (p) value. When each uniquely structured beam probes an object, there will be coupling of power from the pure mode to other LG modes. The complex phase and amplitude coefficients of this modal power coupling will provide a “signature” of the probed object’s 2D structure, and this signature can be detected using a single pixel. We identify a “fan-shaped” object with an opening angle of 120˚ and different angular orientations by analyzing the corresponding complex spatial spectrum of multiple sequential measurements, such that each subsequent tailored mode has l and p indices in the range -15 - +15 and 0-30, respectively. Results show that the amplitude spectrum is insensitive to the object’s angular orientation, whereas the phase spectrum predictably shifts with orientation. Additionally, we demonstrate that an irregular image with a ‘SC’ logo can be reconstructed using the complex modal spectrum. The structural similarity (SSIM) of the reconstructed image increases as the number of modes increases. Specifically, the SSIM increases by 83.5% when the number of modes increases from 36 (6 by 6) to 961 (31 by 31).

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