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17 May 2016 Dynamic control of coherent orbital-angular-momentum beams in turbid environments
K. S. Morgan, J. K. Miller, B. M. Cochenour, E. G. Johnson
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Proceedings Volume 9827, Ocean Sensing and Monitoring VIII; 982706 (2016) https://doi.org/10.1117/12.2229794
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States
Abstract
This work examines the propagation properties of two superimposed coherent orbital angular momentum (OAM) modes for use in underwater systems as an alternative to amplitude modulation. An OAM mode of l=+2 is interfered with OAM mode l=-1 from a λ = 540 nm laser source. These OAM modes are superimposed using a Mach-Zehnder (MZ) interferometer combined with diffractive optical elements. By manipulating the optical path length of one of the MZ legs, the interference of these beams can be temporally controlled. The spatial profile is maintained in a turbid environment up through 4.9 attenuation lengths for both cases.
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K. S. Morgan, J. K. Miller, B. M. Cochenour, and E. G. Johnson "Dynamic control of coherent orbital-angular-momentum beams in turbid environments", Proc. SPIE 9827, Ocean Sensing and Monitoring VIII, 982706 (17 May 2016); https://doi.org/10.1117/12.2229794
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KEYWORDS
Signal attenuation
Phase shift keying
Scattering
Laser scattering
Spiral phase plates
Modulation
Phase modulation
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