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Browsing by Subject "Digital holography"

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All-digital wavefront sensing for structured light beams

Author: Dudley, Angela L ; Milione, G ; Alfano, RR ; Forbes, A Date: 2014 We present a new all-digital technique to extract the wavefront of a structured light beam. Our method employs non-homogeneous polarization optics together with dynamic, digital holograms written to a spatial light modulator to measure the ... Read more
Creation and detection of optical modes with spatial light modulators

Author: Forbes, A ; Dudley, Angela L ; McLaren, M Date: Jun 2016 Modal decomposition of light has been known for a long time, applied mostly to pattern recognition. With the commercialization of liquid-crystal devices, digital holography as an enabling tool has become accessible to all, and with it all-digital ... Read more
Free-space communication with over 100 spatial modes

Author: Rosales-Guzmán, C ; Trichili, A ; Dudley, Angela L ; Ndagano, B ; Salem, AB Date: Oct 2016 By combining both the azimuthal and radial components of Laguerre-Gaussian modes with wavelength division multiplexing, we generated >100 information channels. We implemented a laboratory free-space link using 35 Laguerre-Gaussian modes and ... Read more
Laguerre Gaussian beam multiplexing through turbulence

Author: Trichili, A ; Mhlanga, T ; Naidoo, Darryl ; Dudely, A ; Zghal, M ; Forbes, A Date: 17 Aug 2014 We analyze the effect of atmospheric turbulence on the propagation of multiplexed Laguerre Gaussian modes. We present a method to multiplex Laguerre Gaussian modes using digital holograms and decompose the resulting field after encountering ... Read more
Laser beam characterization with digital holograms

Author: Forbes, A ; Schulze, C ; Flamm, D ; Dudley, Angela L ; Duparre, M Date: Apr 2013 We show how laser beam characterization may be done in real-time with digital holograms. We illustrate the power of the techniques by applying them to a variety of laser sources, from fibers to solid-state. Read more
Modal decomposition without a priori scale information

Author: Schulze, C ; Ngcobo, Sandile ; Duparre, M ; Forbes, A Date: Dec 2012 The modal decomposition of an arbitrary optical field may be done without regard to the spatial scale of the chosen basis functions, but this generally leads to a large number of modes in the expansion. While this may be considered as ... Read more
Real and virtual propagation dynamics of angular accelerating white light beams

Author: Vetter, C ; Dudley, Angela L ; Szameit, A ; Forbes, A Date: Aug 2017 Accelerating waves have received significant attention of late, first in the optical domain and later in the form of electron matter waves, and have found numerous applications in non-linear optics, material processing, microscopy, particle ... Read more
Unraveling light with digital holograms

Author: Forbes, A ; Schulze, C ; Ngcobo, Sandile ; Flamm, D ; Naidoo, Darryl ; Dudley, Angela L ; Duparre, M Date: Feb 2013 Modal decomposition of optical fields as a concept has been in existence for many decades, yet despite its clear applications to laser beam analysis it has nevertheless remained a seldom used tool. With the commercialization of liquid crystal ... Read more
Wavefront reconstruction by modal decomposition

Author: Schulze, C ; Naidoo, Darryl ; Flamm, D ; Schmidt, OA ; Forbes, A ; Duparr, M Date: Aug 2012 We propose a new method to determine the wavefront of a laser beam based on modal decomposition by computer-generated holograms. The hologram is encoded with a transmission function suitable for measuring the amplitudes and phases of the modes ... Read more
White light wavefront control with a spatial light modulator

Author: Spangenberg, D-M ; Dudley, Angela L ; Neethling, PH ; Rohwer, EG ; Forbes, A Date: 2014 Spatial light modulators are ubiquitous tools for wavefront control and laser beam shaping but have traditionally been used with monochromatic sources due to the inherent wavelength dependence of the calibration process and subsequent phase ... Read more

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Browsing by Subject "Digital holography"

Browsing by Subject "Digital holography"

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