Influence of laser spot size and shape on ablation efficiency using ultrashort pulse laser system

Chaja, Michalina W.; Krämer, Thorsten; Neuenschwander, Beat

doi:10.1016/j.procir.2018.08.119

Cited by 19 publications

(10 citation statements)

References 14 publications

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“…By now three different methods are known to determine the threshold fluence. B. Neuenschwander 3 – 5 measures the ablated volume, Liu 2 the bore radius and J. Hermann et al 2 , 6 . the ablation depth.…”

Section: Materials Characterization For Usp Machining Of Metalsmentioning

confidence: 99%

“…By now three different methods are known to determine the threshold fluence. B. Neuenschwander [3][4][5] measures the ablated volume, Liu 2 the bore radius and J. Hermann et al 2,6 the ablation depth. For all approaches, the threshold fluence is considered a material-specific constant.…”

Section: Determination Of the Threshold Fluencementioning

confidence: 99%

“…The focus of this procedure is on the determination of laser-specific and material properties such as threshold fluence, effective penetration depth, and absorption coefficient. The determination of these three material properties relevant for USP processing has already been described in detail in various scientific works by Liu, 2 Neuenschwander et al., 3 – 5 or Hermann et al., 6 but each of these procedures describes the determination of only one of the material properties in dependence on another. In addition, different physical properties, such as multiple reflections and an angle-dependent absorption of the material, are not investigated separately during the survey of the material properties with the above-mentioned approaches.…”

Section: Introductionmentioning

confidence: 99%

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Multiscale model for ultrashort pulsed parallel laser structuring—Part III. Characterization of material properties

2022

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In the field of microstructuring and nanostructuring ultrashort pulsed (USP) laser processing attracts increasing attention due to its ability to generate high-precision structures. A simulation of the USP process can lead to a reduced process development time and help to achieve a better geometrical quality of the manufactured microstructures. To predict the ablation shape, temperature distribution, and distortion in a USP ablation process, a detailed simulation of the physical processes during and after the laser ablation is required. Different simulation tools such as multiscale simulations are already established but still need different and accurate input parameters regarding the material properties of the workpiece to be machined. A material characterization procedure that can be used in a standardized way for different materials and processing stations needs to be developed. The procedure determines the absorption coefficient, penetration depth, and ablation threshold precisely matched to a USP machine and the material used. Based on the material characterization procedure a calibration of the used simulation has to be carried out as precisely as possible. The simulation can then be applied for a digital process development and subsequently validated with specific experiments.

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Section: Materials Characterization For Usp Machining Of Metalsmentioning

confidence: 99%

Section: Determination Of the Threshold Fluencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiscale model for ultrashort pulsed parallel laser structuring—Part III. Characterization of material properties

2022

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“…In both mentioned approaches, the working position and the size of the laser spot are critical process parameters, which have a significant influence on the final result and even shifts of a few micrometres in the working position can lead to deviations in the process results 15 . In particular, for the 3D processing of components and parts, an optimal process control of the working distance is fundamental 16 , 17 .…”

Section: Introductionmentioning

confidence: 99%

Detection and analysis of photo-acoustic emission in Direct Laser Interference Patterning

Steege

Alamri

Lasagni

et al. 2021

Sci Rep

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Functional laser texturing by means of Direct Laser Interference Patterning is one of the most efficient approaches to fabricate well-defined micro textures which mimic natural surfaces, such as the lotus effect for self-cleaning properties or shark skin for reduced friction. While numerous technical and theoretical improvements have been demonstrated, strategies for process monitoring are yet to be implemented in DLIP, for instance aiming to treat complex and non-plane surfaces. Over the last 35 years, it has been shown that the sound pressure generated by a laser beam hitting a surface and producing ablation can be detected and analysed using simple and commercially available transducers and microphones. This work describes the detection and analysis of photo-acoustic signals acquired from airborne acoustic emission during DLIP as a direct result of the laser–material interaction. The study includes the characterization of the acoustic emission during the fabrication of line-like micro textures with different spatial periods and depths, the interpretation the spectral signatures deriving from single spot and interference ablation, as well as a detailed investigation of the vertical extent of the interference effect based on the ablated area and its variation with the interference period. The results show the possibility to develop an autofocusing system using only the signals from the acoustic emission for 3D processing, as well as the possibility to predict deviations in the DLIP processing parameters.

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“…The state-of-the-art scientific investigation of laser ablation efficiency suggested the ratio of laser peak fluence to the ablation threshold close to e 2 ≈ 7.39 for the maximum material ejection rate and the most efficient ablation point 30,31 . Since then, laser ablation efficiency has been investigated in numerous papers in independent groups [32][33][34][35][36][37][38][39][40][41] . The model takes into account the transverse laser intensity distribution has a Gaussian profile, ablation occurs after fluence exceeds the ablation threshold, and ablated depth per pulse is growing logarithmically with the laser fluence on the sample.…”

Section: Introductionmentioning

confidence: 99%

Functional surface formation by efficient laser ablation using single-pulse and burst-modes

Žemaitis

Gaidys

Mikšys

et al. 2021

Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXVI

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Surfaces inspired by nature and their replication find great interest in science, technology, and medicine due to their unique functional properties. This research aimed to develop an efficient laser milling technology using single-pulse-and burst-modes of irradiation to replicate bio-inspired structures over large areas at high speed. The ability to form the trapezoidal-riblets inspired by shark skin at high production speeds while maintaining the lowest possible surface roughness was demonstrated.

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Influence of laser spot size and shape on ablation efficiency using ultrashort pulse laser system

Cited by 19 publications

References 14 publications

Multiscale model for ultrashort pulsed parallel laser structuring—Part III. Characterization of material properties

Multiscale model for ultrashort pulsed parallel laser structuring—Part III. Characterization of material properties

Detection and analysis of photo-acoustic emission in Direct Laser Interference Patterning

Functional surface formation by efficient laser ablation using single-pulse and burst-modes

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