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This work demonstrates an underwater optical link utilizing Orbital Angular Momentum (OAM). Space division multiplexing is used to increase the data rate over a range of modulation frequencies.
An external laser cavity was constructed that utilizes polarization multiplexing to combine the emission from two gallium nitride blue laser diodes. A polarization-dependent narrow-band resonant mirror was designed to be the output coupler of this cavity, which locked both laser diodes at a fixed wavelength of 445.5 nm with a line-width of <0.5 nm. Output powers from this system approached 0.7...
A Ho:YAG rod amplifier is demonstrated for vortex beams with orbital angular momentum. Simulations show nice correlation with experimental data and potentially high gain. This could be used for complex modes and spatial division multiplexing.
This paper explores space division multiplexing of blue lasers for undersea applications. Experimental results will be shown for optical vortices utilizing a range of charge numbers corresponding to various Orbital Angular Momentum states.
We demonstrate the use of non-diffracting beams to control and organize multiple filamentation in air. Here, a pair of laser filaments which twist about the optical axis during propagation is obtained using a Bessel beam superposition.
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