High-charge and multiple-star vortex coronagraphy from stacked vector vortex phase masks

Aleksanyan, Artur; Brasselet, Étienne

doi:10.1364/ol.43.000383

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…With the development of vector OVs, the vortex coronagraph implemented in international ground-based telescope facilities has been based on vectorial vortex masks to obtain higher sensitivity and lower aberrations 299 . With the recent development of multi-singularity tunability, adaptive multiple-vortex coronagraph masks have been developed for multiple-star detections 300,301 . In 2011, Tamburini et al 302 reported the OAM light effect around rotating black holes, which provided a new method to detect black holes, as shown in Fig.…”

Section: Advanced Applications Of Tunable Vbsmentioning

confidence: 99%

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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Thirty years ago, Coullet et al. proposed that a special optical field exists in laser cavities bearing some analogy with the superfluid vortex. Since then, optical vortices have been widely studied, inspired by the hydrodynamics sharing similar mathematics. Akin to a fluid vortex with a central flow singularity, an optical vortex beam has a phase singularity with a certain topological charge, giving rise to a hollow intensity distribution. Such a beam with helical phase fronts and orbital angular momentum reveals a subtle connection between macroscopic physical optics and microscopic quantum optics. These amazing properties provide a new understanding of a wide range of optical and physical phenomena, including twisting photons, spin–orbital interactions, Bose–Einstein condensates, etc., while the associated technologies for manipulating optical vortices have become increasingly tunable and flexible. Hitherto, owing to these salient properties and optical manipulation technologies, tunable vortex beams have engendered tremendous advanced applications such as optical tweezers, high-order quantum entanglement, and nonlinear optics. This article reviews the recent progress in tunable vortex technologies along with their advanced applications.

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Section: Advanced Applications Of Tunable Vbsmentioning

confidence: 99%

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

et al. 2019

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“…It is difficult to search for exoplanets around multiple-star systems because unwanted light from all stars in the system obstructs the detection of exoplanets. Several approaches have been proposed and developed that make use of coronagraphs or postprocessing approaches such as differential imaging methods (e.g., Cady et al 2011;Rodigas et al 2015;Kühn & Patapis 2016;Aleksanyan et al 2017;Aleksanyan & Brasselet 2018). Furthermore, wave front control techniques called super-Nyquist wave front control (SNWC) and multistar wave front control (MSWC) have been developed as a step toward future space coronagraphs (Thomas et al 2015;Belikov et al 2016;Sirbu et al 2017b;Belikov et al 2017;Pluzhnik et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Binary-star Wave Front Control Based on a Common-path Visible Nulling Coronagraph

Yoneta

Murakami

Koike

et al. 2022

ApJS

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Exoplanets around multiple-star systems are interesting targets for direct detection. However, it is difficult to suppress unwanted light from all stars in a system. For direct detection of the exoplanets around multiple-star systems, we propose using common-path visible nulling coronagraphs (CP-VNCs). CP-VNCs can suppress diffracted light from stars located on a central null fringe. In addition, a wave front control system is installed to generate a dark hole by rejecting residual stellar speckles of CP-VNCs. For this purpose, spatial light modulators (SLMs) have the ability to generate a dark hole over a wide field on the order of hundreds of λ/D (where λ is the wavelength of light and D is the telescope diameter), owing to their large number of pixels. We perform a laboratory demonstration of high-contrast observation around a binary-star system model using a CP-VNC combined with an SLM. First, we simulate a high-contrast observation over a region close to one of two stars by generating a square dark hole with side lengths of 40 λ 0/D (where λ 0 is the central wavelength of the light sources). The center of the square region was located about 35 λ 0/D and 79 λ 0/D from each star. Measurements of this first scenario find a mean contrast over the dark hole of 3.5 × 10−8. Second, observation of a region with identical separation (100 λ 0/D) from both stars is also demonstrated. In this scenario, a mean contrast of 2.0 × 10−8 is achieved over a circular dark hole with a diameter of 40 λ 0/D.

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“…[1] Technology based on vortex beams exhibits great potential for optical trapping [2][3][4][5] and optical communications [6][7][8] . Consequently, vortex beams have received considerable attention and been extensively applied for optical microscopy, [9] optical tweezers, [10,11] and astronomy [12,13] and laser structuring. [14][15][16] For certain applications, especially those involving trapping and guiding of microparticles, various types of vortex beams are widely used.…”

Section: Introductionmentioning

confidence: 99%

Modified Bessel–Gaussian Vortex Beam with an Adjustable Broken Opening

Yang

Zhang

et al. 2021

Annalen der Physik

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In this study, an open-ring controllable Bessel vortex beam is theoretically and experimentally constructed with a power-exponent-phase vortex. Its distribution in the far field after being blocked with obstacles is subsequently investigated. In the far field, the beam exhibits different degrees of the open-loop effect following adjustments in the phase term of the power exponent. For an obstructed beam, the direction of the open loop is offset by a certain value, and different open-loop angles can be achieved for different blocking angles. The developed beam can be used to guide particles and avoid obstacles.

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High-charge and multiple-star vortex coronagraphy from stacked vector vortex phase masks

Cited by 7 publications

References 24 publications

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities

Binary-star Wave Front Control Based on a Common-path Visible Nulling Coronagraph

Modified Bessel–Gaussian Vortex Beam with an Adjustable Broken Opening

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