Experimental Verification of an Optical Vortex Coronagraph

Lee, J. H.; Foo, Gregory; Johnson, Eric; Swartzlander, Grover A.

doi:10.1103/physrevlett.97.053901

Cited by 152 publications

(86 citation statements)

References 14 publications

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“…These OVs are localizations in space were the amplitude of the wave is zero and its phase is undefined [1][2][3], while in the surroundings the phase takes a helicoidal form, usually represented with the term exp(imθ), where θ is the azimuthal angle and m is the topological charge representing the number of 2π discontinuities of the wavefront [4]. Due to these features, OVs have been widely used in metrological applications [5,6], phase shifting interferometry [7], stellar choronography [8], among others. To generate the OVs, computer generated holograms (CGHs) [9], spiral phase plates (SPPs) [10] and vortex-producing lenses (VPL) [11] are commonly used.…”

Section: Introductionmentioning

confidence: 99%

Experimental micrometer-displacement measurements based on optical vortices

Londoño¹,

Rueda²,

Gómez³

et al. 2017

Opt. Pura Apl.

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ABSTRACT:In this work, a system for measuring micrometer-displacements based on the characteristics of optical vortices is presented. In the proposal, a binary vortex-producing lens (BVPL) programmed to generate optimized optical vortices is transversally displaced from the optical axis, inducing perturbations on the optical characteristics of the vortices that are used as transduction parameters. Specifically, the method proposed theoretically by Anzolin et al. [18], which is based on the asymmetry of the intensity patterns of the off-axis optical vortices, is studied experimentally by using BVPLs. Experimental implementation is completely described and compared with theoretical results, likewise, metrological characteristics of the experimental metrological system are analyzed. Based on the results, we experimentally confirm the possibility of creating high sensitivity metrological systems by using optical vortices, opening the door for new vortex metrology techniques.Key words: Optical Vortices, Metrology, Micro-displacement. RESUMEN:En este trabajo, un sistema para medir desplazamientos micrométricos basados en las características de vórtices ópticos es presentado. En la propuesta, una lente productora de vórtices binaria (BVPL) programada para generar vórtices ópticos optimizados es desplazada transversalmente del eje óptico, induciendo perturbaciones en las características ópticas de los vórtices que son usadas como parámetros de transducción. Específicamente, el método propuesto por Anzolín et al [18], el cuál es basado en la asimetría de los patrones de intensidad de los vórtices ópticos fuera del eje, es estudiado experimentalmente usando BVPLs. Se describe completamente la implementación experimental y se compara con los resultados teóricos, así mismo, se analizan características metrológicas del sistema metrológico experimental. En base a los resultados, confirmamos experimentalmente la posibilidad de crear sistemas metrológicos de alta sensibilidad utilizando vórtices ópticos, abriendo la puerta para nuevas técnicas de metrología de vórtices.Palabras clave: Vórtices ópticos, Metrología, micro desplazamientos. REFERENCES AND LINKS / REFERENCIAS Y ENLACES[1] J. F. Nye and M. V. Berry, "Dislocations in wave trains," Proc. R. Soc. London Ser. A 336, 165-190 (1974 429-431 (1990).[10] M. W. Beijersbergen, R. P. C. Coerwinkel, M. Kristensen, and J. P. Woerdman, "Helical-wavefront laser beams produced with a spiral phaseplate," Opt. Commun. 112, 321-327 (1994).https://doi.org/10.1016/0030-4018(94)90638-6[11] E. Rueda, D. Muñetón, J. A. Gómez, and A. Lencina, "High-quality optical vortex-beam generation by using a multilevel vortex-producing lens," Opt. Lett. 38, 3941-3944 (2013

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Section: Introductionmentioning

confidence: 99%

Experimental micrometer-displacement measurements based on optical vortices

Londoño¹,

Rueda²,

Gómez³

et al. 2017

Opt. Pura Apl.

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“…We also note that the study of spiral phase filters, as applied to light of finite spatial coherence, is closely related to both spiral phase microscopy (17,18) and optical vortex coronagraphs (19).…”

Section: Introductionmentioning

confidence: 99%

The transition from a coherent optical vortex to a Rankine vortex: beam contrast dependence on topological charge

Toninelli

Aspden

Phillips

et al. 2016

Journal of Modern Optics

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Spatially coherent helically phased light beams carry orbital angular momentum (OAM) and contain phase singularities at their centre. Destructive interference at the position of the phase singularity means the intensity at this point is necessarily zero, which results in a high contrast between the centre and the surrounding annular intensity distribution. Beams of reduced spatial coherence yet still carrying OAM have previously been referred to as Rankine vortices. Such beams no longer possess zero intensity at their centre, exhibiting a contrast that decreases as their spatial coherence is reduced. In this work, we study the contrast of a vortex beam as a function of its spatial coherence and topological charge. We show that beams carrying higher values of topological charge display a radial intensity contrast that is more resilient to a reduction in spatial coherence of the source.

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Section: Introductionmentioning

confidence: 99%

“…This property is closely related to the ability of optical vortices to carry orbital angular momentum and energy [11][12][13][14] . This property is interesting for various applications, such as in optical traps [15][16][17] , information transmission 18-20 , astrophysics 21,22 , microscopy 23,24 , and laser micromachining 25,26 .In nonlinear media, optical vortices are treated as (topological) vortex solitons 4,27,28 . Such topologically stable pulses can act as information carriers 4,[29][30][31] .…”

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confidence: 99%

Stable optical vortices in nonlinear multicore fibers

et al. 2015

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The multicore fiber (MCF) is a physical system of high practical importance. In addition to standard exploitation, MCFs may support discrete vortices that carry orbital angular momentum suitable for spatial-division multiplexing in high-capacity fiber-optic communication systems. These discrete vortices may also be attractive for high-power laser applications. We present the conditions of existence, stability, and coherent propagation of such optical vortices for two practical MCF designs. Through optimization, we found stable discrete vortices that were capable of transferring high coherent power through the MCF. Keywords: coherent energy propagation; multicore fibers; nonlinear vortices INTRODUCTION Vortex structures are widespread in nature and are found in both macroscopic atmospheric phenomena, such as tornadoes and the Great Red Spot of Jupiter, and microscopic-scale objects in quantum physics. Mathematically, vortices are related to topological defects, the accumulation of geometrical phases, and the phase singularity of a complex linear or nonlinear field (see, e.g., Refs. 1-8 and references therein).Optical vortices present a fascinating and expanding area of research that combines fundamental theoretical and mathematical science and maturing applied technologies (see recent review 4 ). Optical vortices are characterized by a wave field with zero intensity, an undefined phase in the vortex center (pivot point) and the presence of a screw dislocation of the wave front 5,6 . All transmutations of vortices in linear and nonlinear fields obey the conservation of the topological charge S, which is defined as the total change of the phase along a closed curve surrounding the pivotal point of the vortex divided by 2p. The special behavior of the phase and amplitude near the vortex pivot point results in the circular flow of energy in optical vortices [7][8][9][10] . This property is closely related to the ability of optical vortices to carry orbital angular momentum and energy [11][12][13][14] . This property is interesting for various applications, such as in optical traps [15][16][17] , information transmission 18-20 , astrophysics 21,22 , microscopy 23,24 , and laser micromachining 25,26 .In nonlinear media, optical vortices are treated as (topological) vortex solitons 4,27,28 . Such topologically stable pulses can act as information carriers 4,[29][30][31] . It is important that continuum vortex solitons are highly sensitive to azimuthal instability. Stabilization is possible by applying optically induced photonic lattices, which lead to a discrete optical vortex field. Different types of discrete lattice vortex solitons were theoretically predicted in the Refs. 32-35 and experimentally demonstrated in the Refs. 36,37. Discrete vortex solitons can also be created in photonic crystal fibers and other types of photonic lattices 38,39 . Discrete vortex solitons are frequently associated with soliton clusters, which feature interesting mobility properties and

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Experimental Verification of an Optical Vortex Coronagraph

Cited by 152 publications

References 14 publications

Experimental micrometer-displacement measurements based on optical vortices

Experimental micrometer-displacement measurements based on optical vortices

The transition from a coherent optical vortex to a Rankine vortex: beam contrast dependence on topological charge

Stable optical vortices in nonlinear multicore fibers

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