Ultrafast imaging analysis of femtosecond laser induced periodic nanoripples on Al film

Liu, Jukun; Qin, Ziyao; Lu, Min; Ju, Jiaqi; Cao, Kaiqiang; Chen, Long; Cheng, K. L.; Huo, Yanyan

doi:10.1007/s00340-022-07805-y

Cited by 3 publications

(2 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resulting highly nonequilibrium state induces phase explosion [7,8], Coulomb explosion [9,10], and thermoelastic wave effects [11,12], ultimately leading to the ablation and fracture of the target materials [13,14]. To gain insight into the underlying ablation mechanisms, researchers have employed femtosecond pump-probe imaging to investigate transient optical properties [15,16]. However, during the signal acquisition process, these ablation processes have a significant effect on the optical response of the target materials [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast quasi-three-dimensional imaging

Lian

Jiang

Sun

et al. 2023

Int. J. Extrem. Manuf.

View full text Add to dashboard Cite

Understanding laser induced ultrafast process with complex three-dimensional (3D) geometrical and extreme property evolution offers unique platform to explore novel physical phenomena and to overcome manufacturing limitations. Ultrafast imaging has been considered as an effective tool due to their exceptional spatiotemporal resolution ability. However, the current imaging techniques with single view imaging actually projecting 3D information on two-dimensional plane, leading to great information loss, and misunderstanding the nature of ultrafast process. Here, we propose a quasi-3D imaging method to describe the 3D ultrafast process and further analyse spatial asymmetric of laser induced plasma. The vertically polarization laser pulses are adopted to illuminate reflection-transmission views, and the binarization techniques are employed to extract contours, forming the corresponding two-dimensional matrix. By rotating and multiplying the two-dimensional contour matrices obtained from the dual views, the quasi-3D image was reconstructed. It successfully unveils dual phase transition mechanisms and elucidates the diffraction phenomena occurring outside the plasma. Furthermore, the quasi-3D image confirms spatial asymmetric of plasma in picosecond plasma, which is hard to acquire in two-dimensional images. Our findings demonstrate that quasi-3D imaging not only offers a more comprehensive understanding of plasma dynamics than previous imaging methods, but also has widespread potential in various ultrafast fields such as strong-field physics, fluid dynamics, and cutting-edge manufacturing.

show abstract

Section: Introductionmentioning

confidence: 99%

Ultrafast quasi-three-dimensional imaging

Lian

Jiang

Sun

et al. 2023

Int. J. Extrem. Manuf.

View full text Add to dashboard Cite

show abstract

“…In past decades, great improvement has been achieved in the field of femtosecond laser processing of solids, which has been an effective method to prepare new kinds of materials. Femtosecond laser can be used to process various kinds of materials, including metals 1 – 4 , semiconductors 5 – 8 , and dielectrics 9 – 11 . Femtosecond laser processing can achieve micro-structures 12 – 14 and doping 15 – 17 on solid surfaces.…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution characteristics of plumes induced by femtosecond laser ablation of silicon in vacuum

Chen¹,

Ning²,

Zhang³

2023

Sci Rep

View full text Add to dashboard Cite

The spatial distribution characteristics of plumes induced by femtosecond laser ablation of silicon in vacuum are studied by using spectroscopy. The plume spatial distribution clearly shows two zones with different characteristics. The center of the first zone is at a distance of approximately 0.5 mm from the target. Silicon ionic radiation, recombination radiation, and bremsstrahlung mainly occur in this zone, causing an exponential decay with a decay constant of approximately 0.151–0.163 mm. The second zone with a greater area, whose center is at a distance of approximately 1.5 mm from the target, follows the first zone. In this zone, the radiation from silicon atoms and electron-atom collisions dominates, leading to an allometric decay with an allometric exponent of approximately − 1.475 to − 1.376. In the second zone, the electron density spatial distribution is approximately arrowhead-shaped, which is potentially induced by collisions between ambient molecules and the particles in front of the plume. These results indicate that both the recombination effect and expansion effect play important roles and compete with each other in plumes. The recombination effect is dominant near the silicon surface, causing exponential decay. As the distance increases, the electron density decreases exponentially by recombination, causing a more intense expansion effect.

show abstract

From surface roughness to crater formation in a 2D multi-scale simulation of ultrashort pulse laser ablation

Thomae,

Stabroth,

Vollmann

et al. 2024

Appl. Phys. A

View full text Add to dashboard Cite

Surface roughness plays a critical role in ultrashort pulse laser ablation, particularly for industrial applications using burst mode operations, multi-pulse laser processing, and the generation of laser-induced periodic surface structures. Hence, we address the impact of surface roughness on the resulting laser ablation topography, comparing predictions from a simulation model to experimental results. We present a comprehensive multi-scale simulation framework that first employs finite-difference-time-domain simulations for calculating the surface fluence distribution on a rough surface measured by atomic-force-microscopy followed by the two-temperature model coupled with hydrodynamic/solid mechanics simulation for the initial material heating. Lastly, a computational fluid dynamics model for material relaxation and fluid flow is developed and employed. Final state results of aluminum and AISI 304 stainless steel simulations demonstrated alignment with established ablation models and crater dimension prediction. Notably, Al exhibited significant optical scattering effects due to initial surface roughness of 15 nm—being 70 times below the laser wavelength -leading to localized, selective ablation processes and substantially altered crater topography compared to idealized conditions. Contrary, AISI 304 with $${R}_{\text{q}}$$ R q surface roughness of 2 nm showed no difference. Hence, we highlight the necessity of incorporating realistic, material-specific surface roughness values into large-scale ablation simulations. Furthermore, the induced local fluence variations demonstrated the inadequacy of neglecting lateral heat transport effects in this context.

show abstract

Ultrafast imaging analysis of femtosecond laser induced periodic nanoripples on Al film

Cited by 3 publications

References 38 publications

Ultrafast quasi-three-dimensional imaging

Ultrafast quasi-three-dimensional imaging

Spatial distribution characteristics of plumes induced by femtosecond laser ablation of silicon in vacuum

From surface roughness to crater formation in a 2D multi-scale simulation of ultrashort pulse laser ablation

Contact Info

Product

Resources

About