From Event: SPIE Optical Engineering + Applications, 2016
There are many techniques to achieve basic wavefront sensing tasks in the weak atmospheric turbulence regime. However, in strong and deep turbulence situations, the complexity of a propagating wavefront increases significantly. Typically, beam breakup will happen and various portions of the beam will randomly interfere with each other. Consequently, some conventional techniques for wavefront sensing turn out to be inaccurate and misleading. For example, a Shack-Hartmann sensor will be confused by multi-spot/zero-spot result in some cells. The curvature sensor will be affected by random interference patterns for both the image acquired before the focal plane and the image acquired after the focal plane. We propose the use of a plenoptic sensor to solve complex wavefront sensing problems. In fact, our results show that even for multiple beams (their wavelengths can be the same) passing through the same turbulent channel, the plenoptic sensor can reconstruct the turbulence-induced distortion accurately. In this paper, we will demonstrate the plenoptic mapping principle to analyze and reconstruct the complex wavefront of a distorted laser beam.
Chensheng Wu, Jonathan Ko, and Christopher C. Davis, "Complex wavefront sensing with a plenoptic sensor," Proc. SPIE 9979, Laser Communication and Propagation through the Atmosphere and Oceans V, 99790Y (Presented at SPIE Optical Engineering + Applications: August 31, 2016; Published: 19 September 2016); https://doi.org/10.1117/12.2239117.
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