Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin–orbit momentum conservation

Dorney, Kevin M.; Rego, Laura; Brooks, Nathan J.; Román, Julio San; Liao, Chen‐Ting; Ellis, Jennifer L.; Zusin, Dmitriy; Gentry, Christian; Nguyen, Quynh L.; Shaw, Justin M.; Picón, Antonio; Plaja, Luis; Kapteyn, Henry C.; Murnane, Margaret M.; Hernández-García, Carlos

doi:10.1038/s41566-018-0304-3

Cited by 173 publications

(99 citation statements)

References 62 publications

(118 reference statements)

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“…One particularly relevant example is the three-foldsymmetric trefoil field present in the 'bicircular' HHG configurations [22][23][24][25][26][34][35][36][37][38][39][40][41] used to produce circularlypolarized harmonics. This field consists of two counterrotating circularly-polarized drivers at different frequencies, and exhibits the same configuration after a polarization rotation by an angle 2π/n, with n ≥ 3.…”

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confidence: 99%

Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

et al. 2019

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High-order harmonic generation stands as a unique nonlinear optical up-conversion process, mediated by a laser-driven electron recollision mechanism, which has been shown to conserve energy, momentum, and spin and orbital angular momentum. Here we present theoretical simulations which demonstrate that this process also conserves a mixture of the latter, the torus-knot angular momentum Jγ, by producing high-order harmonics with driving pulses that are invariant under coordinated rotations. We demonstrate that the charge Jγ of the emitted harmonics scales linearly with the harmonic order, and that this conservation law is imprinted onto the polarization distribution of the emitted spiral of attosecond pulses. We also demonstrate how the nonperturbative physics of high-order harmonic generation affect the torus-knot angular momentum of the harmonics, and we show that this configuration harnesses the spin selection rules to channel the full yield of each harmonic into a single mode of controllable orbital angular momentum.

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confidence: 99%

Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

et al. 2019

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“…XUV/X-ray pulses with OAM are of particular interest for certain classes of experiments 14,15 , preferably in combination with pulse durations in the attosecond regime 16 . To date high-order harmonics in the XUV with OAM have been observed in laser-atom interactions, operating at a moderate intensity () level 17–22 . With progress made in FEL beams 23 , producing intense, attosecond, ultrafast XUV pulses with OAM is a challenge that has yet to be met.…”

Section: Introductionmentioning

confidence: 99%

Intense attosecond pulses carrying orbital angular momentum using laser plasma interactions

2019

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Light beams with helical phase-fronts are known to carry orbital angular momentum (OAM) and provide an additional degree of freedom to beams of coherent light. While OAM beams can be readily derived from Gaussian laser beams with phase plates or gratings, this is far more challenging in the extreme ultra-violet (XUV), especially for the case of high XUV intensity. Here, we theoretically and numerically demonstrate that intense surface harmonics carrying OAM are naturally produced by the intrinsic dynamics of a relativistically intense circularly-polarized Gaussian beam (i.e. non-vortex) interacting with a target at normal incidence. Relativistic surface oscillations convert the laser pulses to intense XUV harmonic radiation via the well-known relativistic oscillating mirror mechanism. We show that the azimuthal and radial dependence of the harmonic generation process converts the spin angular momentum of the laser beam to orbital angular momentum resulting in an intense attosecond pulse (or pulse train) with OAM.

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“…The spin angular momentum (SAM) of light also plays an important role in those applications, e.g. to control polarization and OAM in attosecond pulses [6].…”

Section: Introductionmentioning

confidence: 99%

Optical vortex production mediated by azimuthal index of radial polarization

Lopez-Quintas¹,

Holgado²,

Drevinskas³

et al. 2020

J. Opt.

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Special light beams are becoming more and more interesting due to their applications in particle manipulation, micromachining, telecommunications or light matter-interaction. Both spin and orbital angular momenta of light are exploited often in combination with spatially varying linear polarization profiles (e.g. radial or azimuthal distributions). In this work we study the interaction between those polarization profiles and the spin-orbit angular momenta, finding the relation involved in the mode coupling. We find that this manipulation can be used for in-line production of collinear optical vortices with different topological charges, which can be filtered or combined with controlled linear polarization. The results are valid for continuous wave and ultrashort pulses, as well as for collimated and focused beams. We theoretically demonstrate the proposal, which is further confirmed with numerical simulations and experimental measurements with ultrashort laser pulses.

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Controlling the polarization and vortex charge of attosecond high-harmonic beams via simultaneous spin–orbit momentum conservation

Cited by 173 publications

References 62 publications

Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

Intense attosecond pulses carrying orbital angular momentum using laser plasma interactions

Optical vortex production mediated by azimuthal index of radial polarization

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