Characterization of holographically generated beams via phase retrieval based on Wigner distribution projections

Rodrigo, José A.; Alieva, Tatiana; Cámara, Alejandro; Martínez-Matos, Óscar; Cheben, Pavel; Calvo, M. L.

doi:10.1364/oe.19.006064

Cited by 29 publications

(18 citation statements)

References 33 publications

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“…Note that, alternatively to the CGH, the SAB can also be generated by modulating a Gaussian beam with the corresponding even cubic phase function. In our case, the CGH was addressed into a programmable reflective LCoS-SLM (Holoeye PLUTO, 8-bit gray-level, pixel pitch of 8 μm and 1920 × 1080 pixels) calibrated for a 2π phase shift at the wavelength λ 532 nm and corrected from static aberrations as reported in [19]. To generate the SAB, the hologram was illuminated by a collimated laser beam (λ 532 nm) and then focused by a spherical convergent lens (focal length of 10 cm, N-BK7 glass).…”

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confidence: 99%

Symmetric Airy beams

et al. 2014

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In this Letter a new class of light beam arisen from the symmetrization of the spectral cubic phase of an Airy beam is presented. The symmetric Airy beam exhibits peculiar features. It propagates at initial stages with a single central lobe that autofocuses and then collapses immediately behind the autofocus. Then, the beam splits into two specular off-axis parabolic lobes like those corresponding to two Airy beams accelerating in opposite directions. Its features are analyzed and compared to other kinds of autofocusing beams; the superposition of two conventional Airy beams having opposite accelerations (in rectangular coordinates) and also to the recently demonstrated circular Airy beam (in cylindrical coordinates). The generation of a symmetric Airy beam is experimentally demonstrated as well. Besides, based on its main features, some possible applications are also discussed.

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confidence: 99%

Symmetric Airy beams

et al. 2014

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“…(7) was encoded as a phase-only computer-generated hologram (CGH) following the approach reported in [15,29]. In our case, the CGH was addressed into a programmable reflective LCoS-SLM (Holoeye LETO, 8-bit 256 gray-levels, pixel pitch of 6.4 μm and 1920×1080 pixels) calibrated for a 2π phase shift at the wavelength λ = 532 nm and corrected from static aberrations, as reported in [30]. In order to generate the one-dimensional AB and SAB, the hologram was illuminated by a collimated laser beam (λ = 532 nm) and then focused by a converging cylindrical lens (N-BK7 glass, f = 80 cm) that was placed at a distance f in front of the spatial light modulator (SLM) phase array.…”

Section: Resultsmentioning

confidence: 99%

Dual behavior of caustic optical beams facing obstacles

et al. 2017

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A full propagation analysis on both fold-type and cusp-type caustic optical beams under various setups of obstructions is theoretically and experimentally performed. It is demonstrated that the self-healing property of caustic optical beams that include the famous Airy beam is a quite relative property. In fact, fold-type and cusp-type beams cannot only behave as self-healing beams by blocking the main intensity peak, but also behave as self-breaking ones in a nonintuitive manner: by blocking a lateral side of the beam without touching the central intensity peak. The regeneration and rupture processes of caustic beams follow a nonlocal propagation dynamic unlike the other conventional beams. Moreover, deep differences between fold and cusp caustic beams are pointed out once facing certain obstructions. The cusp-caustic beam can be broken down by the obstacle placed in a dark zone outside the caustic region, while the fold-type one remains unaltered. This beam rupture confirms the key role of a hidden propagating field in the shadow region for cusp beams that coexist with the evanescent one. The obtained results cast down the established idea that the Airy beam is a robust self-healing beam since any caustic beam can behave in a dual manner depending on the obstruction location. These facts open up different perspectives for the applications in which the self-healing properties of the beam are relevant.

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“…2(a). A CGH created following the approach reported in [34] is addressed into a SLM. Note that the rotating ground glass (RGG) diffuser is only used for the generation of partially coherent beams in the Experiment 2.…”

Section: Resultsmentioning

confidence: 99%

Optical coherenscopy based on phase-space tomography

Cámara¹,

Rodrigo²,

Alieva³

2013

Opt. Express

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Abstract:Partially coherent light provides attractive benefits in imaging, beam shaping, free-space communications, random medium monitoring, among other applications. However, the experimental characterization of the spatial coherence is a difficult problem involving second-order statistics represented by four-dimensional functions that cannot be directly measured and analyzed. In addition, real-world applications usually require quantitative characterization of the local spatial coherence of a beam in the absence of a priori information, together with fast acquisition and processing of the experimental data. Here we propose and experimentally demonstrate a technique that solves this problem. It comprises an optical setup developed for automatized video-rate measurement and a method -phase-space tomographic coherenscopy-allowing parallel data acquisition, processing, and analysis. This technique significantly simplifies the spatial coherence analysis and opens up new perspectives for the development of tools exploiting the degrees of freedom hidden into light coherence.

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Characterization of holographically generated beams via phase retrieval based on Wigner distribution projections

Cited by 29 publications

References 33 publications

Symmetric Airy beams

Symmetric Airy beams

Dual behavior of caustic optical beams facing obstacles

Optical coherenscopy based on phase-space tomography

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