The uniform energy distribution of top-hat laser beams is a very attractive property that can offer some advantages compared to Gaussian beams. Especially, the desired intensity be achieved at spot through redistribution across beam spatial profile and, thus, minimize and even eliminate inherent shortcomings in micro-processing. This paper reports an empirical study investigates effects processing micro-structuring compares results with those obtainable conventional beam. In particular,...

We report on high-quality high-throughput laser milling of silicon with a sub-ps delivering more than 1 kW average power the workpiece. In order to avoid heat accumulation effects, processing strategy for was adapted available by using five-pulse bursts, large beam diameter 372 µm limit peak fluence per pulse approximately <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>0.7</mml:mn> </mml:mrow> <mml:mspace...

Laser structuring/texturing of freeform surfaces is attracting the attention researchers and industry because it can enable high impact applications also technology offer important advantages compared to alternative/conventional processes. So far, laser has been applied mostly on planar surfaces, while employing for 3D processing introduces some disturbances that affect conditions. In particular, Beam Incident Angle (BIA) Focal Offset Distance (FOD) variations are two resulting...

Ultrafast lasers micromachining results depend on both the processing parameters and material properties. The obtained thermal effects are negligible if a good combination of is chosen. However, optimizing leading to required surface quality given can be quite complex time consuming. We developed semi-empirical model estimate heat accumulation as function laser fluence, scanning speed repetition rate. simulation were correlated with experimental ones different materials, compared transient...

Femtosecond laser surface texturing is gaining increased interest for optimizing tribological behaviour. However, the parameter selection often conducted through time-consuming and inefficient trial-and-error processes. Although machine learning emerges as an interesting option, multitude of models exists, determining most suitable one predicting femtosecond textures remains uncertain. Furthermore, absence open-source implementations expertise required their utilization hinders adoption...

Preventing and reducing the impact of counterfeiting activities are among most important preoccupations for modern companies to preserve protect value their work. Some technologies use LASER marking code information in 2D, directly on material surface. In this work, deep several materials is investigated. The purpose depth a marked surface (for different : metals dielectrics) as third data storage axis. idea convert performed grey level reading procedure. This can be then used coding. Best...

The today available ultra-short pulsed laser systems offer average power in the range of 100 W or even more resulting high pulse energies. In contrast to treat metals only moderate peak fluences are required work at well-known optimum point, where ablation process is most energy efficient. a standard setup beam deflected by galvo scanner. achievable scan speed limited and therefore also usable repetition frequency power. use bursts instead single pulses possibility further increase rate,...

The exponential rise of femtosecond lasers average power are facing the limit materials. We present solutions to manage this and pave way for high productivity in laser manufacturing .

We compare different pulse durations, modes and repetition rates of infrared ultrashort pulses lasers for the inscription printed electronics sensors under 100 μm scale. investigate widths varying from 200 fs up to 10 ps, standard single versus 5 GHz burst regimes produce most efficient cleanest ablation. The aim investigated process is ablate a layer conductive material like carbon, NiAl or NiCr forming electronic track contours, without damaging support which made dielectric insulator....

Ablation by ultrafast lasers results from a series of complex nonlinear phenomena absorption and transfer energy that take place in the surfaces materials upon irradiation. Provided good window processing parameters is chosen, resulting thermal effects are general negligible, making excellent micromachining tools applicable to most types materials. It thus beneficial understand how ablation affected laser material properties, order optimize processes. We propose an engineering model estimate...

In this work we present picosecond DPSS laser surface texturing optimisation of automotive grade cast iron steel. This application attracts great interest, particularly in the industry, to reduce friction between moving piston parts car engines, order decrease fuel consumption. is accomplished by partially covering with swallow microgrooves inner a liner and currently production process adopting much longer pulse (microsecond) lasers. Lubricated interface conditions require from produce very...

The recent development of Ultra Short Pulse lasers has widely broadened the range possibilities laser material processing. Associated with a proper beam splitting it enables adding to surface new properties by texturing it. We present here fully reflective three splitter compatible high power up 300W 500fs pulses lasers. process results are presented including repeatability pattern, and achievable ablation rate. pattern is 15µm waist gaussian beams 300µm pitch. Compatibility scanning system...

We industrialized the functionalization of metal surfaces with LIPSS using beam shaping techniques, for application on two and three-dimensional medical implants. Osteoblasts adhered mineralized favorably controllably onto produced surfaces.

An integrated tool combining control and diagnostic for nanoprocessing of bio-compatible biological materials and also allowing multiphoton large area laser scanning microscopy has been developed. The device is based on an customized inverted microscope integrating a motorized open x,y stage with very high precision repeatability, a piezoelectric z axe. A strong development in hardware software made the process. Imaging by images reconstruction using resolution CCD camera machining...

Studies on corneal surgery and flap processing enucleated porcine eyes have been performed using a dedicated 100 kHz femtosecond laser source based Ytterbium technology. IR (1035 nm) green (517 studied. Comparisons for ocular are discussed in terms of process efficiency safety aspects. Flaps with typical diameter 6 mm 150 μm thick less than 2 min both wavelengths. The transmittances pulses through the media measured collimated beam during processing. More 25% energy is transmitted whole eye...

Studies on corneal surgery and flap processing enucleated porcine eyes have been performed using a dedicated 100 kHz femtosecond laser source based Ytterbium technology. IR (1035 nm) green (517 studied. Comparisons for ocular are discussed in terms of process efficiency safety aspects. Flaps with typical diameter 6 mm 150 μm thick less than 2 min both wavelengths. The transmittances pulses through the media measured collimated beam during processing. More 25 % energy is transmitted whole eye...

The advantages of the femtosecond laser for micromachining materials have been widely demonstrated allowing to reach a level accuracy in micrometer range level. However, most current applications are flat surfaces, 2D or 2.5D, requiring different kinds machining: drilling, cutting, and texturing, more exotic materials. Biomedical implants part those new objects very high surface finish, complex geometries: cylindrical hemispherical shapes. LASEA has developed system combining with 7...

Enabling of continuous photomasking using a pulsed laser source and polygon scanners to achieve high repetition rates pulse energy, precise beam guiding stable handling the moving web with applied photomask resist.

It has been thoroughly demonstrated in the past years that ultrafast lasers are excellent tools for micromachining virtually all types of materials, provided a good window processing parameters is chosen so resulting thermal effects negligible.The ablation topography by irradiation with these typically depend on several factors related both to laser beam and material characteristics. As consequence, search optimal lead some required dimensions given can be time consuming.To enhance this...