Escherichia coli and Staphylococcus aureus bacterial retention on mirror-polished ultrashort pulse laser-textured surfaces is quantified with a new approach based ISO standards for measurement of antibacterial performance. It shown that both wettability surface morphology influence behavior, neither superhydrophobicity nor low roughness alone sufficient reducing initial either tested cell type. Surface structures comprising spikes, laser-induced periodic (LIPSS) nano-pillars are produced...

This work describes the fabrication of thin microfluidic devices in Kapton (polyimide). These chips are well-suited to perform X-ray scattering experiments using intense microfocussed beams, as is both relatively resistant high intensities generated by a synchrotron, and almost transparent X-rays. We show networks microchannels obtained laser ablation films, we also present simple way fusion bonding between two films. The possibilities offered such illustrated with experiments. demonstrate...

Direct Laser Interference Patterning (DLIP) and Induced Periodic Surface Structures (LIPSS) are two distinct, key technologies for texturing of surfaces with structures in the range comprised between some hundreds nm few µm. Based on different physical phenomena, they enable often showing distinct morphologies pitches. It has been shown possibility superposing LIPSS over DLIP a final multi-scale, hierarchical morphology where coexist. Here, we report an experimental study that it is possible...

Femtosecond (fs) laser technology is currently being considered in innovative fields such as osteotomy and treatment of hard tissue thanks to the achievable high resolution ability prevent damage. In a previous study, suitable process parameters were obtained achieve competitive ablation rates on pork femur processing. Nevertheless, better control thermal accumulation during could further improve postoperative regeneration treated bone compared with conventional procedures push forward...

Femtosecond lasers allow for high-precision, high-quality ablation of biological tissues thanks to their capability minimizing the thermal loads into irradiated material. Nevertheless, reported rates remain still too limited enable exploitation on a clinical level. This study demonstrates possibility upscale process fs laser bone tissue by employing industrially available sources. A comprehensive parametric is presented in order optimize rate while maintaining health avoiding excessive...

In Li-ion batteries, ion diffusion kinetics represent a limitation to combine high capacity and fast charging rate. To bypass this, textured electrodes have been demonstrated increase the active surface, decrease material tortuosity accelerate electrolyte wetting. Amongst structuring technologies, ultrashort pulse laser processing may key option enabling, at same time, precision, negligible deterioration throughput. Here, we report study on of with both holes grooves reaching metallic...

Super-hydrophobic surfaces are nowadays of primary interest in several application fields, as for de-icing devices the automotive and aerospace industries. In this context, laser surface texturing has widely demonstrated to be an easy one-step method produce super-hydrophobic on materials. work, a high average power (up 40W), repetition-rate 1MHz), femtosecond infrared was employed 316L steel. The set process parameters which behavior is optimized, obtained by varying energy repetition rate....

Micromachining with high repetition rate femtosecond lasers and galvo scanners shows some limitations in the pulses positioning accuracy due to mirrors acceleration. This is particularly evident during scan speed or direction changes, resulting a poor quality overtreatment e.g. corners. Several scanning approaches have been proposed tackle these issues like so-called skywriting (SW) pulse-on-demand (POD) being last limited ns lasers, moderate pulse rates speeds. Recently, POD approach has...

The interaction between laser pulses and material surface can generate sub-wavelength structures named ripples. used of ultrashort avoid thermal effect in the lattice so generated are well preserved be observed on various materials as metals, polymers or crystals. With increasing energy deposit, ripples grow to give cone-shape spikes. All these interesting special properties treated coloration change, improvement light absorption modification wettability properties. These structure...

The recent availability on the market of industrial, reliable, ultrashort pulse lasers (UPLs) delivering hundreds watts has opened possibility for this technology to significantly increase machining throughput and address an ever-larger number industrial applications. Nevertheless, heat accumulation phenomena are observed as soon average power P exceeds tens watts, compromising peculiar UPL quality. In case, a given process, it is determinant implement specific beam engineering strategy...

Femtosecond lasers have been proved to be an effective fabrication tool process with high machining quality and negligible thermal effects a wide variety of materials. However, the system technology enabling fast precise scanning on workpiece, currently limits average power these laser sources less than 10 Watts in most industrial application. To overcome this limitation, proportional up-scaling both, repetition rate scan speed is needed, demanding for faster technologies. Recently, rugged,...

Femtosecond Laser Induced Surface Structures evolve from ripples to spikes upon the increase of energy dose Φ. Nevertheless, for a fixed Φ, several process parameters (pulse energy, repetition rate, average power, overlapping, etc.) play an important role in determining resulting morphology. Here we show that beam intensity profile Î as well has bearing on structures morphology evolution. In case Gaussian beam, been modified by varying size d. We observed stationary and Φ value, passing d =...

The combination of both, fast beam scanning systems and high repetition rate, average power lasers, represents an interesting technological solution for surface texturing by Ultra-Short Pulses Laser to gain a foothold into industrial environment commercial purposes. Nevertheless unwanted thermal effects are expected when the exceeds some tens W. An strategy reliable heat management would consists surfaces with low fluence values (slightly higher than ablation threshold) utilising polygon...

High power ultrafast lasers are nowadays able to provide high ablation rates and meet the technical requirements performances needed for many industrial applications. However depositing more energy into target material may induce heat accumulation. Consequently it enhances efficiency as well introduces some detrimental effects on processing quality. Thus, identify parameters of influence (pulse duration, repetition rate, fluence, pulse overlap, scanning velocity…) their operating windows...

Ultra-short pulse laser (UPL) industry is counting on high power P sources (100W class) to increase the throughput of a wide variety industrial fabrication process. Nevertheless, this poses challenge overcome heat accumulation phenomena observed when exceeds few tens Watts compromising machining quality. Novel beam engineering strategies are required tackle issue and guarantee with high, distinctive, UPL Here study reported processes carried out 100W class femtosecond lasers following two...

Percussion drilling is a well-established technique for several applicative markets such as aircraft and watch industries. Lamp pumped solid state lasers more recently fiber lasers, operating in millisecond or nanosecond regimes, are classically used these applications. However, due to their long pulse duration, technologies not suitable emerging market fuel injectors automotive industry. Only the ultrashort laser technology, combined with special optics like trepanning head, has potential...

We demonstrated herein a new type of cladding light strippers suitable for high power systems. By precisely micro-machining the surface fiber we create CLS with efficiencies as 97 % large NA, multi-mode, (NA = 0.3), and 70 single-mode, low light. The NA is reduced from 0.3 down to 0.08. exhibit 1°C/stripped-Watt temperature elevation making them very applications. This fabrication method simple reliable. have tested different texturization geometries on several fibers: 20/400 Nufern, KAGOME,...

Amongst the technologies enabling surface structuring at nanoscale, Ultra-Short Pulse laser (USP) plays a key role when targeting high process robustness, throughput, and large area processing. In frame of "Tres Clean" project, texturing ≈1 m² surfaces has been recently shown, with possibility to effectively replicate nanostructures by injection moulding. Nevertheless, extend USP nanotexturing over several m2 through continuous production represents still an issue due need...

Generation of nano or micro-scale structures on materials surface enables new functions and properties, such as super-hydrophobicity by lotus effect, blackening light trapping, modification tribological etc. which are in high demand for a wide variety industrial fields. Amongst the functionalization techniques, Ultra-Short Pulse lasers have been proven to be reliable tool create Laser Induced Periodic Surface Structures (LIPSS). Exploitation LIPSS purposes poses some key problems like up...

Deep engraving of 3D textures is a very demanding process for the creation master tool e. g molds, forming tools or coining dies. As these masters are uses reproduction patterns materials typically hard and brittle thus difficult to machine. The new generation industrial femtosecond lasers provides both high accuracy results ablation rates at same time. Operation pulse energies 40 μJ repetition in Mhz range detrimental effect heat accumulation has be avoided. Therefore scanning speeds...