Controlling the evolution of nondiffracting speckle by complex amplitude modulation on a phase-only spatial light modulator

Dudley, Angela; Vasilyeu, R; Белый, В. Н.; Хило, Н. А.; Ропот, П. И.; Forbes, Andrew

doi:10.1016/j.optcom.2011.09.004

Cited by 47 publications

(26 citation statements)

References 27 publications

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“…The SLM is a phaseonly device, yet many of the desired holograms require both amplitude and phase change to the field. To achieve this, we make use of the well-known method of complex amplitude modulation [24][25][26] , because this is suitable for implementation on SLMs. There are several means by which to implement this (see Arrizon et al 25,26 and references therein), and for the benefit of the reader we briefly outline one approach used in the creation of our modes.…”

Section: Resultsmentioning

confidence: 99%

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A digital laser for on-demand laser modes

et al. 2013

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Customizing the output beam shape from a laser invariably involves specialized optical elements in the form of apertures, diffractive optics and free-form mirrors. Such optics require considerable design and fabrication effort and suffer from the further disadvantage of being immutably connected to the selection of a particular spatial mode. Here we overcome these limitations with the first digital laser comprising an electrically addressed reflective phaseonly spatial light modulator as an intra-cavity digitally addressed holographic mirror. The phase and amplitude of the holographic mirror may be controlled simply by writing a computer-generated hologram in the form of a grey-scale image to the device, for on-demand laser modes. We show that we can digitally control the laser modes with ease, and demonstrate real-time switching between spatial modes in an otherwise standard solid-state laser resonator. Our work opens new possibilities for the customizing of laser modes at source.

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Section: Resultsmentioning

confidence: 99%

“…4) exploited complex amplitude modulation to implement amplitude modulation on the phase-only SLM [24][25][26] . In other words, the SLM can be used to create customized apertures, for example, the fine wires (loss-lines) used in the past for Hermite-Gaussian mode selection 2,3 .…”

Section: Resultsmentioning

confidence: 99%

A digital laser for on-demand laser modes

et al. 2013

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“…The absence of axial intensity gradients in propagation-invariant beams is also a useful property for isolating scattering-based axial optical forces. Although the Bessel beam is a popular example of a propagation-invariant beam, various patterns can exhibit propagation invariance, even speckle-like patterns [78,79]. The defining property is that the pattern is formed by a set of plane waves whose wave vectors lie on a cone, which corresponds to a spatial power spectrum that forms a ring (see Figure 4A).…”

Section: Propagation-invariant and Self-healing Beamsmentioning

confidence: 99%

“…Instead of iteratively tailoring the phase of the plane wave, a random phase can be assigned to the phase waves in the light cone. Then, a nondiffracting speckle pattern is produced (e.g., see Figure 4C from [79]). In contrast, a Bessel beam of m th -order is formed when the plane wave phases are designed to vary linearly around the wave-vector cone and the phase increments by 2πm after every turn (higher-order Bessel beam in Figure 4D is from [81]).…”

Section: Propagation-invariant and Self-healing Beamsmentioning

confidence: 99%

Engineering light-matter interaction for emerging optical manipulation applications

et al. 2014

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Abstract:In this review, we explore recent trends in optical micromanipulation by engineering light-matter interaction and controlling the mechanical effects of optical fields. One central theme is exploring the rich phenomena beyond the now established precision measurements based on trapping micro beads with tightly focused beams. Novel synthesized beams, exploiting the linear and angular momentum of light, open new possibilities in optical trapping and micromanipulation. Similarly, novel structures are promising to enable new optical micromanipulation modalities. Moreover, an overview of the amazing features of the optics of tractor beams and backward-directed energy fluxes will be presented. Recently the so-called effect of negative propagation of the beams (existence of the backward energy fluxes) has been confirmed for X-waves and Airy beams. In the review, we will also discuss the negative pulling force of structured beams and negative energy fluxes in the vicinity of fibers. The effect is achieved due to the interaction of multipoles or, in another interpretation, the momentum conservation. Both backward-directed Poynting vector and backward optical forces are counter-intuitive and give an insight into new physics and technologies. Exploiting the degrees of freedom in synthesizing novel beams and designed microstructures offer attractive prospects for emerging optical manipulation applications.

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“…In particular, the former handicap has been widely investigated, developing methods for encoding amplitude and phase into phase-only filters [1][2][3][4][5][6][7][8][9]. Applications of phase-only filters include, but are not limited to, pattern recognition [10,11], correlation discrimination [12], optical encryption [13], shaping of femtosecond pulses [14], or research on nondiffracting speckle fields [15].…”

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confidence: 99%

Encoding complex fields by using a phase-only optical element

2014

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We show that the amplitude and phase information from a two-dimensional complex field can be synthesized from a phase-only optical element with micrometric resolution. The principle of the method is based on the combination of two spatially sampled phase elements by using a low-pass filter at the Fourier plane of a 4 − f optical system. The proposed encoding technique was theoretically demonstrated, as well as experimentally validated with the help of a phase-only spatial light modulator for phase encoding, a conventional CMOS camera to measure the amplitude of the complex field, and a Shack-Hartmann wavefront sensor to determine its phase.

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Controlling the evolution of nondiffracting speckle by complex amplitude modulation on a phase-only spatial light modulator

Cited by 47 publications

References 27 publications

A digital laser for on-demand laser modes

A digital laser for on-demand laser modes

Engineering light-matter interaction for emerging optical manipulation applications

Encoding complex fields by using a phase-only optical element

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