Investigation on the Ablation of thin Metal Films with Femtosecond to Picosecond-pulsed Laser Radiation

Olbrich, M.; Punzel, Eric; Lickschat, Peter; Weißmantel, Steffen; Horn, Alexander

doi:10.1016/j.phpro.2016.08.017

Cited by 23 publications

(21 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By irradiating a material using ultrafast laser radiation the temperature of the phonon system increases within the heating time τ heat , being defined by τ heat = max{τ e-ph ; τ H }, wherein τ e-ph = 1 [26,27] represents the electronphonon relaxation time or also called electron-phonon coupling time in the absence of ablation, and τ H the pulse duration. By increasing the temperature of the phonon system, thermal stress is induced, which usually induces a thermal expansion of the material in the case of slow heating, and therefore unloading and reduction of the induced thermal stress.…”

Section: Two-temperature Modelmentioning

confidence: 99%

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Metzner

Olbrich

Lickschat

et al. 2020

Lasers Manuf. Mater. Process.

View full text Add to dashboard Cite

This study intends to present a simple two-temperature model (TTM) for the fast calculation of the ablation depth as well as the corresponding effective penetration depth for stainless steel by considering temperature-dependent material parameters. The model is validated by a comparison of the calculated to the experimentally determined ablation depth and the corresponding effective penetration depth in dependence on the pulse duration (200 fs up to 10 ps) and the fluence. The TTM enables to consider the interaction of pulsed laser radiation with the electron system and the subsequent interaction of the electrons with the phonon system. The theoretical results fit very well to the experimental results and enable the understanding of the dependence of the ablation depth and of the effective penetration depth on the pulse duration. Laser radiation with a pulse duration in the femtosecond regime results in larger ablation depths compared to longer-pulsed laser radiation in the picosecond regime. Analogously to the ablation depth, larger effective penetration depths are observed due to considerably higher electron temperatures for laser radiation with pulse durations in the femtosecond regime.

show abstract

Section: Two-temperature Modelmentioning

confidence: 99%

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Metzner

Olbrich

Lickschat

et al. 2020

Lasers Manuf. Mater. Process.

View full text Add to dashboard Cite

show abstract

“…However, in the solution of the two-temperature model equations, the temperature dependence of C e and G ep should be considered. As an example, Figure 3 reports that according to Olbrich et al [54], the heat capacity (per material unit volume) of electrons (C e ), the electron-phonon coupling constant (G = G ep ), and the relaxation time to reach a thermal equilibrium between the electron and phonon systems (τ R ) for some selected metals (Al, Au, Mo, Ni, Pt) versus the electronic temperature T e . On the other hand, considering a laser pulse of duration τ pulse , the two-temperatures model equations are useful if τ p is comparable to the lifetime of excited electrons τ ee and to the electron-phonon coupling time τ ep (i.e., for the femtosecond or picosecond laser pulse).…”

Section: Laser-metal Films Interaction: General Considerationsmentioning

confidence: 99%

“…Figure 4 reports the results of calculations performed by Olbrich et al [54] for the time evolution of the maximum electronic temperature T max,e and of the maximum phonons temperature T max, ph in Al, Au, Mo, Ni, Pt under a pulsed laser irradiation with a pulse duration of τ H = 200 fs (left) or τ H = 10 ps (right), laser energy of 1 μJ, laser wavelength of 1028 nm (and considering, for simplicity, zero reflectance for all the metals, only energy diffusion and no vaporization). From these plots, we can observe, for example, that for all the investigated materials, T max,e is higher for τ H = 200 fs than for τ H = 10 ps since the laser-generated energy is completely transferred from the electrons to the phonons during the laser irradiation at τ H = 10 ps.…”

Section: Laser-metal Films Interaction: General Considerationsmentioning

confidence: 99%

“…Depending on the nature of the properties of the metal film, of the substrate, and of the type laser, metal nanoparticles [26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53], metal microbumps [54], spatially ordered metal nanostructures such as spikes and ripples (laser-induced periodic surface structures) [55,56], metal nanobumps and nanojets [57,58,59,60,61,62,63,64,65,66,67] can be produced; the study of which has continued until very recent times [68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanostructuration of Thin Metal Films by Pulsed Laser Irradiations: A Review

Ruffino

Grimaldi

2019

Nanomaterials

View full text Add to dashboard Cite

Metal nanostructures are, nowadays, extensively used in applications such as catalysis, electronics, sensing, optoelectronics and others. These applications require the possibility to design and fabricate metal nanostructures directly on functional substrates, with specifically controlled shapes, sizes, structures and reduced costs. A promising route towards the controlled fabrication of surface-supported metal nanostructures is the processing of substrate-deposited thin metal films by fast and ultrafast pulsed lasers. In fact, the processes occurring for laser-irradiated metal films (melting, ablation, deformation) can be exploited and controlled on the nanoscale to produce metal nanostructures with the desired shape, size, and surface order. The present paper aims to overview the results concerning the use of fast and ultrafast laser-based fabrication methodologies to obtain metal nanostructures on surfaces from the processing of deposited metal films. The paper aims to focus on the correlation between the process parameter, physical parameters and the morphological/structural properties of the obtained nanostructures. We begin with a review of the basic concepts on the laser-metal films interaction to clarify the main laser, metal film, and substrate parameters governing the metal film evolution under the laser irradiation. The review then aims to provide a comprehensive schematization of some notable classes of metal nanostructures which can be fabricated and establishes general frameworks connecting the processes parameters to the characteristics of the nanostructures. To simplify the discussion, the laser types under considerations are classified into three classes on the basis of the range of the pulse duration: nanosecond-, picosecond-, femtosecond-pulsed lasers. These lasers induce different structuring mechanisms for an irradiated metal film. By discussing these mechanisms, the basic formation processes of micro- and nano-structures is illustrated and justified. A short discussion on the notable applications for the produced metal nanostructures is carried out so as to outline the strengths of the laser-based fabrication processes. Finally, the review shows the innovative contributions that can be proposed in this research field by illustrating the challenges and perspectives.

show abstract

“…This operation greatly increased machining speeds of alumina surface, thereby minimizing the costs, and making femtosecond laser machining a feasible choice for industrial consumers. Olbrich et al [ 26 ] also explored the ablation of thin metal films using variable-pulsed laser radiations. They studied the ablation characteristics of several metals, namely aluminum, gold, molybdenum, nickel, and platinum focusing on pulse duration for single-pulsed ultrafast laser radiation.…”

Section: Introductionmentioning

confidence: 99%

Micromachining of Biolox Forte Ceramic Utilizing Combined Laser/Ultrasonic Processes

et al. 2020

View full text Add to dashboard Cite

Micromachining has gained considerable interest across a wide range of applications. It ensures the production of microfeatures such as microchannels, micropockets, etc. Typically, the manufacturing of microchannels in bioceramics is a demanding task. The ubiquitous technologies, laser beam machining (LBM) and rotary ultrasonic machining (RUM), have tremendous potential. However, again, these machining methods do have inherent problems. LBM has issues concerning thermal damage, high surface roughness, and vulnerable dimensional accuracy. Likewise, RUM is associated with high machining costs and low material-removal rates. To overcome their limits, a synthesis of LBM and RUM processes known as laser rotary ultrasonic machining (LRUM) has been conceived. The bioceramic known as biolox forte was utilized in this investigation. The approach encompasses the exploratory study of the effects of fundamental input process parameters of LBM and RUM on the surface quality, machining time, and dimensional accuracy of the manufactured microchannels. The performance of LRUM was analyzed and the mechanism of LRUM tool wear was also investigated. The results revealed that the surface roughness, depth error, and width error is decreased by 88%, 70%, and 80% respectively in the LRUM process. Moreover, the machining time of LRUM is reduced by 85%.

show abstract

Investigation on the Ablation of thin Metal Films with Femtosecond to Picosecond-pulsed Laser Radiation

Cited by 23 publications

References 26 publications

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Experimental and Theoretical Determination of the Effective Penetration Depth of Ultrafast Laser Radiation in Stainless Steel

Nanostructuration of Thin Metal Films by Pulsed Laser Irradiations: A Review

Micromachining of Biolox Forte Ceramic Utilizing Combined Laser/Ultrasonic Processes

Contact Info

Product

Resources

About