Modeling of ultrafast laser pulse propagation

Kolesík, M.; Brown, J. N.; Bahl, Anand

doi:10.1117/12.2223428

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…This is often done in two different regimes: A "macroscopic" simulation of laser-pulse evolution over distances of millimeters or centimeters, where the gas is treated as a medium that includes the linear field response, nonlinear field response, including the possibly rotational field response for a diatomic gas, field ionization, and free electron response [6,7]. In the second, "microscopic", regime the interaction of the field with a single atom or molecule is examined in the quantum mechanical picture.…”

Section: Introductionmentioning

confidence: 99%

Strong-field ionization and gauge dependence of nonlocal potentials

Rensink

Antonsen

2016

Phys. Rev. A

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Nonlocal potential models have been used in place of the Coulomb potential in the Schrodinger equation as an efficient means of exploring high field laser-atom interaction in previous works. Although these models have found use in modeling phenomena including photo-ionization and ejected electron momentum spectra, they are known to break electromagnetic gauge invariance. This paper examines if there is a preferred gauge for the linear field response and photoionization characteristics of nonlocal atomic binding potentials in the length and velocity gauges. It is found that the length gauge is preferable for a wide range of parameters.

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Section: Introductionmentioning

confidence: 99%

Strong-field ionization and gauge dependence of nonlocal potentials

Rensink

Antonsen

2016

Phys. Rev. A

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Imaging ultrafast evolution of subwavelength-sized topography using single-probe structured light microscopy

Min

Zhang

et al. 2022

Photon. Res.

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Imaging ultrafast processes in femtosecond (fs) laser–material interactions such as fs laser ablation is very important to understand the physical mechanisms involved. To achieve this goal with high resolutions in both spatial and temporal domains, a combination of optical pump–probe microscopy and structured illumination microscopy can be a promising approach, but suffers from the multiple-frame method with a phase shift that is inapplicable to irreversible ultrafast processes such as ablation. Here, we propose and build a wide-field single-probe structured light microscopy (SPSLM) to image the ultrafast three-dimensional topography evolution induced by fs lasers, where only a single imaging frame with a single structured probe pulse is required for topography reconstruction, benefiting from Fourier transform profilometry. The second harmonic of the fs laser is used as the structured probe light to improve spatial lateral resolution into the subwavelength region of ∼ 478 nm , and the spatial axial and temporal resolutions are estimated to be ∼ 22 nm and ∼ 256 fs , respectively. With SPSLM, we successfully image the ultrafast topography evolution of a silicon wafer surface impacted by single and multiple fs pulses. The variable formation and evolution of the laser induced periodic surface structures during an ultrashort time are visualized and analyzed. We believe that SPSLM will be a significant approach for revealing and understanding various ultrafast dynamics, especially in fs laser ablation and material science.

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Modeling of ultrafast laser pulse propagation

Cited by 2 publications

References 36 publications

Strong-field ionization and gauge dependence of nonlocal potentials

Strong-field ionization and gauge dependence of nonlocal potentials

Imaging ultrafast evolution of subwavelength-sized topography using single-probe structured light microscopy

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