Surface and microstructure investigation of picosecond versus femtosecond laser pulse processed copper

Anderson, Mark; Ediger, Aaron; Tsubaki, Alfred; Zuhlke, Craig; Alexander, Dennis R.; Gogos, George; Shield, Jeffrey E.

doi:10.1016/j.surfcoat.2021.126872

Cited by 25 publications

(6 citation statements)

References 63 publications

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“…Simultaneously, the probe pulse passes this interaction area and irradiates the detector, carrying the transient information. The delay between the pump and probe pulses can be adjusted by mechanical and electronic devices, which determine the various time slices of the total dynamic process 25–27 …”

Section: Time‐resolved Pump–probe Imagingmentioning

confidence: 99%

“…The delay between the pump and probe pulses can be adjusted by mechanical and electronic devices, which determine the various time slices of the total dynamic process. [25][26][27] Taking into account the transmission situation, the non-excited medium has an absorption coefficient ɑ 0 . Excited states mostly decay exponentially, and the absorption rate decreases to Δɑ 0 immediately after excitation according to…”

Section: Principlementioning

confidence: 99%

See 1 more Smart Citation

Ultrafast imaging for uncovering laser–material interaction dynamics

Wang

Wei

Yuan

et al. 2022

Int Journal of Mech Sys Dyn

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The physical mechanism of the dynamics in laser–material interaction has been an important research area. In addition to theoretical analysis, direct imaging‐based observation of ultrafast dynamic processes is an important approach to understand many fundamental issues in laser–material interaction such as inertial confinement fusion (ICF), laser accelerator construction, and advanced laser production. In this review, the principles and applications of three types of commonly used ultrafast imaging methods are introduced, including the pump–probe, X‐ray diagnosis, and single‐shot optical burst imaging. We focus on the technical features such as the spatial and temporal resolution for each technique, and present several conventional applications.

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Section: Time‐resolved Pump–probe Imagingmentioning

confidence: 99%

Section: Principlementioning

confidence: 99%

Ultrafast imaging for uncovering laser–material interaction dynamics

Wang

Wei

Yuan

et al. 2022

Int Journal of Mech Sys Dyn

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“…Figure 3 illustrates how the redeposited layer is grown on bulk aluminum moth-eye structures during multiple fast laser scanning processes [30,31]. The bulk aluminum moth-eye structures were formed by introducing surrounding grooves via laser ablation [6,18,32].…”

Section: Characterizationmentioning

confidence: 99%

Analysis of anti-reflection mechanisms of the black aluminum alloy made by femtosecond laser processing

Du²,

Sun³

et al. 2022

Mater. Res. Express

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Mitigating the optical reflection of aluminum alloy over a broad spectral range from 0.45μm to 15μm is vital for many applications. This can be realized by introducing efficient light-absorbing textured surfaces via femtosecond laser surface processing. However, a clear analysis of anti-reflection mechanisms of such textured surfaces has not been reported yet. This paper proposes a numerical model of anti-reflective structures is proposed based on SEM and EDS characterization. Multiple anti-reflection mechanisms were revealed intuitively through FDTD simulation.

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“…The ultrafast ablation is achieved with extreme physical conditions induced by high-density photon energy at femto or picosecond-time regions. The short diffusion time and confinement of absorbed energy to the laser spot ensure the localized and minimized damage for metals and semiconductors, resulting in effective modifications in optical and mechanical properties of materials [4][5][6][7]. Hence, qualitatively different ablation mechanisms resulted by various laser parameters such as wavelength, intensity, pulse duration, repetition rate, etc, have attracted broad efforts using both experimental and numerical approaches in recent two decades [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Critical pulse in multi-shot femtosecond laser ablation on metallic surfaces

Wang,

Kong,

et al. 2024

Nanotechnology

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Thermal effect remains a thorny issue for femtosecond-laser surface engineering and nanostructuring on metallic targets with high pulse energies or high repetition rates, which needs to be paid adequate attentions. Herein, we have experimentally investigated the heat diffusion and accumulations during single-shot and multi-shot femtosecond laser ablation on metallic surfaces. We have for the first time observed a novel phenomenon that the thermal effect was intensified abruptly when the laser-pulse number goes over a threshold (approximately between 10 and 20 for aluminum alloy with laser fluence of 6 J cm-2), accompanied with a dramatic reduction of ablated depth and complicated plasma dynamics. Based on both optical and thermodynamic analysis, we introduced a defocusing-dominated plasma-assistant model for this abnormal thermal effect. This work explored the critical experimental parameters for femtosecond-laser surface modification and processing in micro-scale engineering applications.

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Surface and microstructure investigation of picosecond versus femtosecond laser pulse processed copper

Cited by 25 publications

References 63 publications

Ultrafast imaging for uncovering laser–material interaction dynamics

Ultrafast imaging for uncovering laser–material interaction dynamics

Analysis of anti-reflection mechanisms of the black aluminum alloy made by femtosecond laser processing

Critical pulse in multi-shot femtosecond laser ablation on metallic surfaces

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