Continuum Models of Ultrashort Laser–Matter Interaction in Application to Wide-Bandgap Dielectrics

Bulgakova, Nadezhda M.; Zhukov, V. P.

doi:10.1007/978-3-319-02898-9_5

Cited by 7 publications

(3 citation statements)

References 111 publications

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“…A study describing all interaction processes, including laser propagation effects and macroscopic material response as hydrodynamics and heat diffusion, is out of the scope of the present work, some results having been reported in Refs. [21,[36][37][38][39][40][41]. The proposed model describing the full time-dependent electron dynamics, and including various material characteristics, is based on OBE.…”

Section: Introductionmentioning

confidence: 99%

Optical Bloch modeling of femtosecond-laser-induced electron dynamics in dielectrics

et al. 2020

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A model based on optical Bloch equations is developed to describe the interaction of femtosecond laser pulses with dielectric solids, accounting for optical-cycle-resolved electron dynamics. It includes the main physical processes at play: photoionization, impact ionization, direct and collisional laser heating, and recombination. By using an electron band structure, this approach also accounts for material optical properties as nonlinear polarization response. Various studies are performed, shedding light on the contribution of various processes to the full electron dynamics depending on laser intensity and wavelength. In particular, the standard influence of the impact ionization process is retrieved.

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Section: Introductionmentioning

confidence: 99%

Optical Bloch modeling of femtosecond-laser-induced electron dynamics in dielectrics

et al. 2020

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“…It was also reported that longitudinal periodicity of nanogratings could be explained by interference of short-living exciton polaritons [31,32]. In contrast to plasma wave [1] and nanoplasmonic models [2,4], this approach requires low electron densities, as at higher densities the exciton-polariton interaction is heavily screened by the electron plasma when it begins to efficiently absorb laser energy [44]. Finally, Liao et al suggested that excitation of standing plasma waves at the interfaces between modified and unmodified areas played a crucial role in promoting the growth of periodic nanogratings [7] and their self-organization mechanism had similarities with femtosecond-laser-induced surface ripples formation [41].…”

Section: Introductionmentioning

confidence: 99%

From random inhomogeneities to periodic nanostructures induced in bulk silica by ultrashort laser

2016

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Femtosecond laser-induced volume nanograting formation is numerically investigated. The developed model solves nonlinear Maxwell's equations coupled with multiple rate free carrier density equations in the presence of randomly distributed inhomogeneities in fused silica. As a result of the performed calculations, conduction band electron density is shown to form nanoplanes elongated perpendicular to the laser polarization. Two types of nanoplanes are identified. The structures of the first type have a characteristic period of the laser wavelength in glass and are attributed to the interference of the incident and the inhomogeneity-scattered light waves. Field components induced by coherent multiple scattering in directions perpendicular to the laser polarization are shown to be responsible for the formation of the second type of structures with a subwavelength periodicity. In this case, the influence of the inhomogeneity concentration on the period of nanoplanes is shown. The calculation results not only help to identify the physical origin of the self-organized nanogratings, but also explain their period and orientation.

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“…The generation of carrier density due to the photoionization and impact ionization in dielectric material can be described by [16].…”

Section: Semiconductors and Dielectricsmentioning

confidence: 99%

Fundamentals of Ultrashort Pulse Laser Interactions: Mechanisms, Material Responses, and the Genesis of LIPSS

Vaghasiya,

Miclea

2024

Pulsed Laser Processing of Materials

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In recent years, ultrashort pulse laser-material processing has gained significant attention due to its broad applications across nearly all manufacturing sectors. This chapter delves into the foundational aspects of the ultrashort pulse laser-material interaction and elucidates the intricacies of the underlying ablation mechanisms. Due to peculiarities between the metal energy absorption in contrast to the semiconductor or dielectric, the first section provides an in-depth exploration of laser-material dynamics, emphasizing the unique responses of various substrates under ultrashort pulse irradiation. A theoretical analysis of ultrashort laser-matter interaction can be represented by the two-temperature model, which describes the temperature of the electron or carrier and lattice in non-equilibrium conditions when ultrashort laser pulses are applied. As the narrative progresses, the spotlight shifts to one of the most interesting phenomena associated with these interactions: the formation of Laser-Induced Periodic Surface Structures (LIPSS). The second section unravels the genesis and evolution of LIPSS, demystifying LIPSS formation mechanisms and the pivotal role played by the ultrashort pulse duration.

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Continuum Models of Ultrashort Laser–Matter Interaction in Application to Wide-Bandgap Dielectrics

Cited by 7 publications

References 111 publications

Optical Bloch modeling of femtosecond-laser-induced electron dynamics in dielectrics

Optical Bloch modeling of femtosecond-laser-induced electron dynamics in dielectrics

From random inhomogeneities to periodic nanostructures induced in bulk silica by ultrashort laser

Fundamentals of Ultrashort Pulse Laser Interactions: Mechanisms, Material Responses, and the Genesis of LIPSS

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