Holographic optical element to generate achromatic vortices

Atencia, Jesús; Collados, M. Victoria; Quintanilla, Manuel; Marín-Sáez, Julia; Sola, Íñigo J.

doi:10.1364/oe.21.021056

Cited by 23 publications

(17 citation statements)

References 20 publications

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“…The generation of achromatic vortex has attracted a lot of research interest in recent years due to their potential in applications with broadband, intense, ultrashort laser pulses. In the past decade, several different schemes are proposed for generating achromatic vortex through dispersion compensation 37–41 , by introducing a radial phase modulation for spiral phase plates 42 , via spin-to-orbit conversion through Geometric phase accumulation 21, 43–46 and using conical glass devices exploiting total internal reflection 47–49 . However, these schemes require a dedicated optical component for the task and its fabrication process often turns out to be expensive and demanding to keep the efficiency and quality of the generated achromatic vortex at an acceptable level.…”

Section: Introductionmentioning

confidence: 99%

Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach

Naik

Saad

Rao

et al. 2017

Sci Rep

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The more than a century old Sagnac interferometer is put to first of its kind use to generate an achromatic single-charge vortex equivalent to a Laguerre-Gaussian beam possessing orbital angular momentum (OAM). The interference of counter-propagating polychromatic Gaussian beams of beam waist ωλ with correlated linear phase (ϕ 0 ≥ 0.025 λ) and lateral shear (y 0 ≥ 0.05 ωλ) in orthogonal directions is shown to create a vortex phase distribution around the null interference. Using a wavelength-tunable continuous-wave laser the entire range of visible wavelengths is shown to satisfy the condition for vortex generation to achieve a highly stable white-light vortex with excellent propagation integrity. The application capablitiy of the proposed scheme is demonstrated by generating ultrashort optical vortex pulses, its nonlinear frequency conversion and transforming them to vector pulses. We believe that our scheme for generating robust achromatic vortex (implemented with only mirrors and a beam-splitter) pulses in the femtosecond regime, with no conceivable spectral-temporal range and peak-power limitations, can have significant advantages for a variety of applications.

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Section: Introductionmentioning

confidence: 99%

Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach

Naik

Saad

Rao

et al. 2017

Sci Rep

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“…In such a beam, the average OAM per photon is lℏ. To simplify the calculations, we only consider LG beams with a radial mode index p 0 here, and restrict the study around the beam waist, so that the phase curvature can be neglected.In previous works on the generation of broadband beams carrying OAM (see, e.g., [5][6][7][8]), most of the efforts have been focused on ensuring that the mode index l is the same for all frequencies ω within the beam spectral width. But correlating l and ω can provide new degrees of freedom to shape ultrashort beams in space and time, and thus to tailor and control laser-matter interactions.…”

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confidence: 99%

Spatio-temporal light springs: extended encoding of orbital angular momentum in ultrashort pulses

2015

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We introduce a new class of spatio-temporally coupled ultrashort laser beams, which are obtained by superimposing Laguerre-Gauss beams whose azimuthal mode index is correlated to their frequency. These beams are characterized by helical structures for their phase and intensity profiles, which both encode the orbital angular momentum carried by the light. They can easily be engineered in the optical range, and are naturally produced at shorter wavelengths when attosecond pulses are generated by intense femtosecond Laguerre-Gauss laser beams. These spatio-temporal "light springs" will allow for the transfer of the orbital angular momentum to matter by stimulated Raman scattering.

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“…[81][82][83] The choice of the carrier waves decides how the spiral beams are delivered in 3-D space. This same principle has been used to generate a variety of exotic complex light with OAM, such as Mathieu beams, 84 achromatic vortices, 85 modulated optical vortices, 86 optical-vortex filaments, 63 spiraling higher-order Bessel beams, 87 beams with fractional topological charges, 88,89 and perfect vortex beam. 90,91 The disadvantages of employing an HOE for the generation of special beams carrying OAM, such as lower efficiency, are discussed in Ref.…”

Section: Generation Using Holographic Optical Elementsmentioning

confidence: 99%

Generation and decomposition of scalar and vector modes carrying orbital angular momentum: a review

et al. 2019

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Orbital angular momentum (OAM), one of the most recently discovered degrees of freedom of light beam field has fundamentally revolutionized optical physics and its technological capabilities. Optical beams with OAM have enabled a large variety of applications, including super-resolution imaging, optical trapping, classical and quantum optical communication, and quantum computing, to mention a few. To enable these and several other emerging applications, optical beams with OAM have been generated using a variety of methods and technologies, such as a simple astigmatic lens pair, one-/two-dimensional holographic optical elements, threedimensional spiral phase plates, optical fibers, and recent entrants such as metasurfaces. All these techniques achieve spatial light modulation and can be implemented with either passive elements or active devices, such as liquid crystal on silicon and digital micromirror devices. Many of these devices and technologies are not only used for the generation of amplitude phase-polarization structured light beams but are also capable of analyzing them. We have attempted to encompass a wide variety of such technologies as well as a few emerging methodologies, broadly categorized into generation and detection protocols. We address the needs of scientists and engineers who desire to generate/detect OAM modes and are looking for the technique (active or passive) best suited for their application. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Holographic optical element to generate achromatic vortices

Cited by 23 publications

References 20 publications

Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach

Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach

Spatio-temporal light springs: extended encoding of orbital angular momentum in ultrashort pulses

Generation and decomposition of scalar and vector modes carrying orbital angular momentum: a review

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