Energy deposition and incubation effects of nonlinear absorption of ultrashort laser pulses in dielectrics

Guo, Ziyue; Hu, Kailin; Cao, Tao; Liu, Shaozhen; Yan, Jikun; Li, Zhou; Xu, Qi; Corkum, P. B.; Peng, Jiahui

doi:10.1364/oe.453063

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…In recent years, improving the fs laser processing efficiency has attracted more and more attention [6][7][8] . Previous studies usually focused on adjusting laser parameters such as pulse energy, pulse number, and pulse width.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ionization control by temporally shaped fs+ps double-pulse sequence on ZnO

et al. 2023

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We designed a femtosecond (fs) + picosecond (ps) double-pulse sequence by using a Mach-Zehnder-like apparatus to split a single 120 fs pulse into two sub-pulses, and one of them was stretched to a width of 2 ps by a four-pass grating system. Through observing the ripples induced on the ZnO surface, we found the ionization rate appeared to be higher for the sequence in which the fs pulse arrived first. The electron rate equation was used to calculate changes of electron density distribution for the sequences with different delay times. We suggest that using a temporally shaped fs+ps pulse sequence can achieve nonlinear ionization control and influence the induced ripples.

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Section: Introductionmentioning

confidence: 99%

Nonlinear ionization control by temporally shaped fs+ps double-pulse sequence on ZnO

et al. 2023

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“…Additionally, the research on polymer film substrate structure nano/microtextured by nanosecond laser pulses was explored [8][9][10][11]. Moreover, the research on aircraft skin after laser removal mainly focuses on surface integrity including mechanical properties, surface morphology characteristics, and surface microscopic characteristics [12][13][14]. Meanwhile, the finite element method (FEM) has been used to forecast the laser process effect in studies [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Multi-Perspective Evaluations of Laser-Removal Quality of Acrylic Polyurethane Coatings on Aluminum Alloy Substrate

Huang

Shen

et al. 2023

Coatings

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Evaluation systems for objects after laser removal have not been systematically established, yet they have great significance for repairing engineering coating materials. In general, this paper mainly focused on the surface quality after laser removal, which was simulated by thermal models and characterized by microscopic, residual chemical compositions, and wettability. The laser removal threshold was considered to be a key indicator to regulate removal precision. Here, the thermal model was used to explore the threshold was 15 J/cm2, and the ablation P was 308 W at 100 kHz. Besides, the surface structure was observed through simulation before experiments. It also predicted the effect of laser power and overlapping on surface roughness, and therefore provided the theoretical reference for experiments. Then, two groups of samples were set up of the surface of acrylic polyurethane coatings on 2024 aluminum alloy with and without anodizing treatment, respectively. After the coatings were removed, microscopic morphologies demonstrated a wavy undulation structure with little residue. Meanwhile, the increments of roughness were less than 0.5 μm and the surfaces were with nice wettability. Evaluating the surface quality from the above aspects is meaningful and helpful for the non-destructive cleaning of aircraft skin coatings.

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Diagnostics of fs Laser‐Induced Plasmas in Solid Dielectrics

Jürgens,

Garcia,

Balling

et al. 2024

Laser & Photonics Reviews

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The formation of dense plasmas inside dielectric materials by ultrashort laser pulses has many applications ranging from refractive‐index modifications to the formation of channels and voids. Furthermore, such plasmas enable the fundamental investigation of ultrafast non‐equilibrium dynamics in highly excited materials. The present paper provides an overview of current experimental approaches to investigating such plasmas. Much information about the plasma relaxation is obtained by measuring the spatial and temporal evolution of the dielectric properties of the excited material through time‐resolved absorption and phase‐shift measurements. In order to investigate and resolve the individual stages of plasma formation, experimental approaches with a temporal resolution beyond the capabilities of traditional optical pump‐probe studies are required. Recent examples for schemes that may enable the investigation of the plasma formation with sub‐cycle time resolution are thus reviewed. These include recent results from time‐resolved high‐harmonic generation as well as the two‐color pump‐probe analysis of non‐perturbative low‐order wave mixing for the tracking of strong‐field excitation dynamics. Alternative approaches employ attosecond transient absorption spectroscopy, attosecond polarization spectroscopy and nonlinear photoconductive sampling for resolving the temporal evolution of the carrier dynamics down to sub‐optical‐cycle timescales.

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Energy deposition and incubation effects of nonlinear absorption of ultrashort laser pulses in dielectrics

Cited by 8 publications

References 31 publications

Nonlinear ionization control by temporally shaped fs+ps double-pulse sequence on ZnO

Nonlinear ionization control by temporally shaped fs+ps double-pulse sequence on ZnO

Multi-Perspective Evaluations of Laser-Removal Quality of Acrylic Polyurethane Coatings on Aluminum Alloy Substrate

Diagnostics of fs Laser‐Induced Plasmas in Solid Dielectrics

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