Beam quality measure for vector beams

Ndagano, Bienvenu; Sroor, Hend; McLaren, Melanie; Rosales‐Guzmán, Carmelo; Forbes, Andrew

doi:10.1364/ol.41.003407

Cited by 106 publications

(87 citation statements)

References 38 publications

(39 reference statements)

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“…If the beam incident on the system is already a vector beam, the spiral phase structures in the incoming beam cancel those phases embedded in the gratings, and the result is a delta function at a higher diffraction order where these phases cancel 33 . If the incoming vector beam is generated with another q -plate, the phenomena can be regarded as a subtraction of the generating and detecting q -plate 34 .…”

Section: Results: Building a Multiple Vector Beam Generatormentioning

confidence: 99%

Vector Beam Polarization State Spectrum Analyzer

Moreno

Davis

Badham

et al. 2017

Sci Rep

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We present a proof of concept for a vector beam polarization state spectrum analyzer based on the combination of a polarization diffraction grating (PDG) and an encoded harmonic q-plate grating (QPG). As a result, a two-dimensional polarization diffraction grating is formed that generates six different q-plate channels with topological charges from −3 to +3 in the horizontal direction, and each is split in the vertical direction into the six polarization channels at the cardinal points of the corresponding higher-order Poincaré sphere. Consequently, 36 different channels are generated in parallel. This special polarization diffractive element is experimentally demonstrated using a single phase-only spatial light modulator in a reflective optical architecture. Finally, we show that this system can be used as a vector beam polarization state spectrum analyzer, where both the topological charge and the state of polarization of an input vector beam can be simultaneously determined in a single experiment. We expect that these results would be useful for applications in optical communications.

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Section: Results: Building a Multiple Vector Beam Generatormentioning

confidence: 99%

Vector Beam Polarization State Spectrum Analyzer

Moreno

Davis

Badham

et al. 2017

Sci Rep

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“…3(c), in the PWE eigen mode the chosen singular point is surrounded by an 'L-line' that maps into the equator on the polarization Poincaré sphere; in contrast, the surrounding polarization states in the VSHG case turn into an equator-centered "8-like" loop that is across two hemispheres. Such interesting azimuthal position squeezing will be the subject of future studies on optical parametric amplification systems with specialized theoretical and experimental tools [18,19].…”

Section: Dynamic Tomography For Cylindrical Vector Modesmentioning

confidence: 99%

Dynamic tomography of the spin-orbit coupling in nonlinear optics

Zhou

Gao

et al. 2019

Phys. Rev. A

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Spin-orbit coupling (SOC) light fields with spatially inhomogeneous polarization have attracted increasing research interest within the optical community. In particular, owing to their spin-dependent phase and spatial structures, many nonlinear optical phenomena which we have been familiar with up to now are being re-examined, hence a revival of research in nonlinear optics.To fully investigate this topic, knowledge on how the topological structure of the light field evolves is necessary, but, as yet, there are few studies that address the structural evolution of the light field. Here, for the first time, we present a universal approach for theoretical tomographic treatment of the structural evolution of SOC light in nonlinear optics processes. Based on a Gedanken vector second harmonic generation, a fine-grained slice of evolving SOC light in a nonlinear interaction and the following diffraction propagation are studied theoretically and verified experimentally, and which at the same time reveal several interesting phenomena. The approach provides a useful tool for enhancing our capability to obtain a more nuanced understanding of vector nonlinear optics, and sets a foundation for further broad-based studies in nonlinear systems.

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“…Vector beams can be quantified and analyzed using a variety of approaches, including geometric phase measurement [37], shear interferometry [38], Bell violations [3,39,40], and quantum state tomographies via projective measurements [41]. Despite these advances, all previously suggested measures of non-separability assess only a predefined subspace of vector beams, the surface of a specific higher-order Poincaré sphere (HOPS) [42][43][44].…”

mentioning

confidence: 99%

“…The formal analogy between non-separable vector beams and entangled quantum states allows the application of quantum concepts to classical light beams. Concurrence, a quantum measure of entanglement in two dimensions, has been identified as a good measure of the degree of non-separability of vector beams, a vector quality factor [40,41]. Here we will define the concurrence in terms of Stokes projections, providing a spatially resolved and basis-independent measure of entanglement.…”

mentioning

confidence: 99%

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Basis-independent tomography and nonseparability witnesses of pure complex vectorial light fields by Stokes projections

et al. 2019

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Complex vectorial light fields, non-separable in their polarization and spatial degree of freedom, are of relevance in a wide variety of fields encompassing microscopy, metrology, communication and topological studies. Controversially, they have been suggested as analogues to quantum entanglement, raising fundamental questions on the relation between non-separability in classical systems, and entanglement in quantum systems. Here we propose and demonstrate basis-independent tomography of arbitrary vectorial light fields by relating their concurrence to spatially resolved Stokes projections. We generate vector fields with controllable non-separability using a novel compact interferometer that incorporates a digital micro-mirror device (DMD), thus offering a holistic toolbox for the generation and quantitative analysis of arbitrary vectorial light fields.

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Beam quality measure for vector beams

Cited by 106 publications

References 38 publications

Vector Beam Polarization State Spectrum Analyzer

Vector Beam Polarization State Spectrum Analyzer

Dynamic tomography of the spin-orbit coupling in nonlinear optics

Basis-independent tomography and nonseparability witnesses of pure complex vectorial light fields by Stokes projections

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