Above-threshold ionization of argon with ultrashort orbital-angular-momentum beams

Sen, Arnab; Sinha, Abhisek; Sen, Sanket; Sharma, Vandana; Gopal, Ram

doi:10.1103/physreva.106.023103

Cited by 4 publications

(1 citation statement)

References 57 publications

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“…High-order harmonics carrying orbital angular momentum have been experimentally generated [25][26][27][28] and studied theoretically [29,30] with the overall goal of creating light pulses with controllable OAM values. Studies of strong-field ionization have been limited to experiments involving Argon gas [31] and theoretical quantum trajectory Monte Carlo simulations of SFI involving Bessel beams [32]. Accurate descriptions of these fields are required in order to have maximum impact in each of these applications.…”

Section: Introductionmentioning

confidence: 99%

Determining the Orbital Angular Momentum of a Vortex Beam Using Strong Field Ionization

Pasquinilli,

Schimmoller,

Walker

et al. 2023

Photonics

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While interferometric methods exist for classifying vortex states of light, these techniques usually require destroying the beam of interest to determine the light’s OAM. A recent two-color pump-probe experiment employed strong field ionization and beam sculpting to classify vortex beams. Here, we propose an alternative strong-field method for distinguishing OAM states of light which does not require beam sculpting and instead utilizes a noncollinear terahertz standing wave to probe ionized electrons. We then use classical trajectory Monte Carlo (CTMC) methods to simulate strong-field ionization of helium under this configuration with the terahertz field both on and off. We find that the resulting electron momenta distributions can be used to extract the OAM of the beam, as long as the vortex beam spot size does not exceed 1/4 the terahertz pulse’s wavelength.

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Section: Introductionmentioning

confidence: 99%

Determining the Orbital Angular Momentum of a Vortex Beam Using Strong Field Ionization

Pasquinilli,

Schimmoller,

Walker

et al. 2023

Photonics

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Photoelectron momentum distribution in structured strong fields

Sinha,

Sen,

Sen

et al. 2024

J. Phys. B: At. Mol. Opt. Phys.

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In this study, a reaction microscope is used to explore the behavior of electrons in shaped beams under strong field conditions. Photoelectron momentum spectra indicate that the inclusion of orbital angular momentum (OAM) of light does not significantly impact the available electron angular momentum states. However, the distinctive donut shape of the beam plays a crucial role in determining the observed Photoelectron Angular Distributions (PADs). TDSE simulations, incorporating focal volume averaging indicates that the geometric properties of the focal region of the OAM and the Gaussian beams affect the photoelectron spectra differently. By averaging the spectra across different intensity regions, we have provided a qualitative explanation for the variations in photoelectron spectra resulting from the shapes of the individual beams. This result shows that the transfer of OAM in ultrashort light pulses cannot be detected in gas ensembles due to the ionization being overwhelmed by atoms in the most intense region with minimal spatial phase variation within the laser field. We demonstrate that the differences in the momentum spectra arising from shaped beams can be qualitatively explained using models that incorporate the spatial averaging of the beam, rather than focusing on the OAM content.

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Atomic photoionization by spatiotemporal optical vortex pulses

Chen

Zhou

et al. 2023

Phys. Rev. A

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Above-threshold ionization of argon with ultrashort orbital-angular-momentum beams

Cited by 4 publications

References 57 publications

Determining the Orbital Angular Momentum of a Vortex Beam Using Strong Field Ionization

Determining the Orbital Angular Momentum of a Vortex Beam Using Strong Field Ionization

Photoelectron momentum distribution in structured strong fields

Atomic photoionization by spatiotemporal optical vortex pulses

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