Demonstration of adaptive optics for mitigating laser propagation through a random air-water interface

Phillip Land; Arun K. Majumdar

doi:10.1117/12.2229307

17 May 2016 Demonstration of adaptive optics for mitigating laser propagation through a random air-water interface

Phillip Land, Arun K. Majumdar

Proceedings Volume 9827, Ocean Sensing and Monitoring VIII; 982703 (2016) https://doi.org/10.1117/12.2229307
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

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.

Citation Download Citation

Phillip Land and 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); https://doi.org/10.1117/12.2229307

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