17 May 2016 Demonstration of adaptive optics for mitigating laser propagation through a random air-water interface
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Abstract
This paper describes a new concept of mitigating signal distortions caused by random air-water interface using an adaptive optics (AO) system. This is the first time the concept of using an AO for mitigating the effects of distortions caused mainly by a random air-water interface is presented. We have demonstrated the feasibility of correcting the distortions using AO in a laboratory water tank for investigating the propagation effects of a laser beam through an airwater interface. The AO system consisting of a fast steering mirror, deformable mirror, and a Shack-Hartmann Wavefront Sensor for mitigating surface water distortions has a unique way of stabilizing and aiming a laser onto an object underneath the water. Essentially the AO system mathematically takes the complex conjugate of the random phase caused by air-water interface allowing the laser beam to penetrate through the water by cancelling with the complex conjugates. The results show the improvement of a number of metrics including Strehl ratio, a measure of the quality of optical image formation for diffraction limited optical system. These are the first results demonstrating the feasibility of developing a new sensor system such as Laser Doppler Vibrometer (LDV) utilizing AO for mitigating surface water distortions.
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Phillip Land, Phillip Land, Arun K. Majumdar, Arun K. Majumdar, } "Demonstration of adaptive optics for mitigating laser propagation through a random air-water interface", Proc. SPIE 9827, Ocean Sensing and Monitoring VIII, 982703 (17 May 2016); doi: 10.1117/12.2229307; https://doi.org/10.1117/12.2229307
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