Phase and amplitude modification of a laser beam by two deformable mirrors using conventional 4f image encryption techniques

Chensheng Wu; Jonathan Ko; John Robertson Rzasa; Christopher C. Davis

doi:10.1117/12.2275733

30 August 2017 Phase and amplitude modification of a laser beam by two deformable mirrors using conventional 4f image encryption techniques

Chensheng Wu, Jonathan Ko, John Robertson Rzasa, Christopher C. Davis

Author Affiliations +

Proceedings Volume 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI; 1040803 (2017) https://doi.org/10.1117/12.2275733
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

The image encryption and decryption technique using lens components and random phase screens has attracted a great deal of research interest in the past few years. In general, the optical encryption technique can translate a positive image into an image with nearly a white speckle pattern that is impossible to decrypt. However, with the right keys as conjugated random phase screens, the white noise speckle pattern can be decoded into the original image. We find that the fundamental ideas in image encryption can be borrowed and applied to carry out beam corrections through turbulent channels. Based on our detailed analysis, we show that by using two deformable mirrors arranged in similar fashions as in the image encryption technique, a large number of controllable phase and amplitude distribution patterns can be generated from a collimated Gaussian beam. Such a result can be further coupled with wavefront sensing techniques to achieve laser beam correction against turbulence distortions. In application, our approach leads to a new type of phase conjugation mirror that could be beneficial for directed energy systems.

Conference Presentation

Citation Download Citation

Chensheng Wu, Jonathan Ko, John Robertson Rzasa, and Christopher C. Davis "Phase and amplitude modification of a laser beam by two deformable mirrors using conventional 4f image encryption techniques", Proc. SPIE 10408, Laser Communication and Propagation through the Atmosphere and Oceans VI, 1040803 (30 August 2017); https://doi.org/10.1117/12.2275733

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