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Browsing by Subject "Spatial light modulators"

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Bessel-Gaussian entanglement; presentation

Author: Mclaren, M ; Roux, FS ; Forbes, A Date: Jul 2013 This is a power point presentation on testing Bessel-Gaussian entanglement. 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
Digital control of laser modes with an intra-cavity spatial light modulator

Author: Ngcobo, Sandile ; Litvin, I ; Burger, L ; Forbes, A Date: Feb 2014 In this paper we outline a simple laser cavity which produces customised on-demand digitally controlled laser modes by replacing the end-mirror of the cavity with an electrically addressed reflective phase-only spatial light modulator as a ... Read more
Digital laser mode amplification using ND: YAG amplifier

Author: Bell, Teboho ; Ngcobo, Sandile Date: Jul 2016 In this paper we demonstrate the output power amplification of the generated higher-order modes from a digital laser by using an extra-cavity Nd: YAG amplifier. Read more
Digital mode selection using an intracavity SLM

Author: Burger, L ; Litvin, I ; Forbes, A Date: Jul 2012 We describe the performance of twisted nematic liquid crystal (TNLC) spatial light modulators (SLMs) when used for intracavity beam shaping. Read more
Excitation of high-radial-order Laguerre-Gaussian modes in a solid-state laser using lower-loss digitally controlled amplitude mask

Author: Bell, Lebohang T ; Hasnaoui, A ; Ait-Ameur, K ; Ngcobo, Sandile Date: Sep 2017 In this paper, we experimentally demonstrate selective excitation of highradial-order Laguerre-Gaussian (LGp or LGp;0) modes with radial-order, p = 1 - 4 and azimuthal-order, l = 0, using a diode-pump solid-state laser (DPSSL) that is digitally ... Read more
Exploiting the spatial profiles of light

Author: Dudley, Angela L ; Rosales-Guzman, C ; Trichilli, A ; Forbes, A Date: Jan 2017 We implement digital holograms for the creation and detection of the spatial modes of light. We make use of modal decomposition theory to determine the numerous properties of light, from the modal content of laser beams to decoding the ... Read more
How to make a digital laser

Author: Burger, L ; Litvin, I ; Ngcobo, Sandile ; Forbes, A Date: Mar 2014 The beam from a laser resonator is determined by the optical elements it contains. Most commonly, these consist of two spherical mirrors, but phase- and amplitude-modulating elements can also be included to produce custom beams. For every ... Read more
Measuring phase with Stokes measurements

Author: Dudley, Angela L ; Milione, G ; Alfano, R ; Forbes, A Date: Jul 2014 The presentation focuses on how horizontal and vertical components of a field can be extracted via Stokes polarimetry 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
Quantum entanglement with a hermite-gaussian pump; poster

Author: McLaren, M ; Romero, J ; Giovannini, D ; Galvez, EJ ; Padgett, MJ ; Forbes, A Date: Jul 2013 Typically, a Gaussian mode is used to pump a non-linear crystal to produce pairs of entangled photons. We demonstrate orbital angular momentum (OAM) entanglement when a non-fundamental mode is used to pump a non-linear crystal. An approximation ... 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
Selective excitation of higher-radial-order Laguerre-Gaussian beams using a solid-state digital laser

Author: Bell, Teboho ; Ngcobo, Sandile Date: Jan 2017 In this paper, we use a digital laser to generate high-radial-order Laguerre-Gaussian, LGp,0 modes by loading digital holograms on a phase-only spatial light modulator that act as an end mirror of a diode-end-pumped laser resonator. The digital ... Read more c b d
Shaping and detecting mid-IR light with a spatial light modulator

Author: Maweza, Elijah L ; Gailele, Lucas M ; Strauss, Hencharl J ; Litvin, Ihar ; Forbes, A ; Dudley, Angela L Date: Oct 2016 We demonstrate the operation and calibration of a spatial light modulator in the mid-IR region by creating and measuring the modal content and wavefront of structured light fields at 2um for the first time. Read more
Shaping light

Author: Forbes, A ; Long, Craig S ; Loveday, Philip W ; Litvin, I Date: 2010 Modern micro-optical elements and adaptive mirrors exploit diffraction to shape light inside a laser. Read more
Simulating spontaneous parametric down-conversion using classical light: Conference paper

Author: Zhang, Y ; McLaren, M ; Roux, FS ; Forbes, A Date: Aug 2014 We present a simple way of simulating Spontaneous parametric down-conversion (SPDC) by modulating a classical laser beam with two spatial light modulators (SLM) through a back projection setup. This system has the advantage of having very ... Read more
Tuneable Gaussian to flat-top resonator by amplitude beam shaping

Author: Ngcobo, Sandile ; Ait-Ameur, K ; Litvin, I ; Hasnaoui, A ; Forbes, A Date: Sep 2013 We outline a simple laser cavity comprising an opaque ring and a circular aperture that is capable of producing spatially tuneable laser modes, from a Gaussian beam to a Flat-top beam. The tuneability is achieved by varying the diameter of ... Read more
Tuneable Gaussian to flat-top resonator by amplitude beam shaping using a digital laser

Author: Ngcobo, Sandile ; Ait-Ameur, K ; Litvin, I ; Hasnaoui, A ; Forbes, A Date: Feb 2014 In this paper we experimentally demonstrate a simple laser cavity that produces spatial tuneable laser modes from a Gaussian beam to a Flat-top beam and a Donut-beam. The laser cavity contains an opaque ring and an adjustable circular aperture ... Read more
Wavefront sensing with all-digital Stokes measurements

Author: Dudley, Angela L ; Milione, G ; Alfano, RR ; Forbes, A Date: 25 Sep 2014 A long-standing question in optics has been to efficiently measure the phase (or wavefront) of an optical field. This has led to numerous publications and commercial devices such as phase shift interferometry, wavefront reconstruction via ... Read more

Now showing items 1-19 of 19

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