Browsing by Subject "Feixos de làser"
Now showing items 1-10 of 10
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Cost-effective microfabrication of sub-micron-depth channels by femto-laser anti-stiction texturing
(2020-02-26)
Article
Open AccessMicro Electro Mechanical Systems (MEMS) and microfluidic devices have found numerous applications in the industrial sector. However, they require a fast, cost-effective and reliable manufacturing process in order to compete ... -
Flat focusing mirrors
(Institute of Electrical and Electronics Engineers (IEEE), 2015)
Conference report
Restricted access - publisher's policyWe present the flat focusing mirror - the dielectric mirrors capable to focus and image the narrow beams in reflections. The mirrors are flat, and transversally invariant, i.e. have no optical axis. We consider two different ... -
Influence of laser beam power and scanning speed on the macrostructural characteristics of AISI 316L and AISI 431 stainless steel depositions produced by laser cladding process
(2021-04-05)
Article
Open AccessIn the laser cladding process, control of the process parameters and knowledge of the characteristics of the materials used are essential for obtaining depositions with excellent metallurgical union, satisfactory dilution ... -
Optical drills by dynamic high-order bessel beam mixing
(American Physical Society (APS), 2022-03-25)
Article
Open AccessOne of the key trends in laser material processing is the usage of structured laser beams. Collimated and focused Gaussian beams are the most common tools; however, more exotic beams can be beneficial too. For instance, ... -
Rotating acoustic drills by the interference of detuned vortices
(Institute of Electrical and Electronics Engineers (IEEE), 2022)
Conference report
Restricted access - publisher's policyWe present acoustic drill beams, structured sound beams exhibiting a dynamic intensity distribution that matches the shape of a helix. The intensity distribution rotates along the beam axis with controlled direction and ... -
Schädigungsparameter für Laserstrahlschweißverbindungen unter zyklischen, mehraxialen Belastungen
(Universitat Politècnica de Catalunya / Technische Universität Darmstadt, 2011)
Master thesis (pre-Bologna period)
Restricted access - author's decisionIn der Automobil- und Luftfahrtbranche werden Laserstrahlschweißverbindungen häufig benutzt. Die Technologie erlaubt eine effektive Verbindung dünnwandiger Leichtbaukonstruktionen. Bei schneller Fertigung ermöglicht sie ... -
Study of femtosecond laser beam focusing in a direct-write system
(Universitat Politècnica de Catalunya, 2016-07-22)
Master thesis
Open AccessDirect-write techniques appear as a versatile option in rapid-prototyping applications because they can directly transfer a custom pattern from a digital file. Lasers are a distinguished tool which allow to perform non-contact ... -
Study of heat sources interacting in integrated circuits by laser mirage effect
(2014-08-25)
Article
Restricted access - publisher's policyThis work exploits the mirage effect to analyze multiple heat sources thermally interacting in an integrated circuit (IC) by means of a probe IR laser beam, which strikes on the die lateral walls and passes through the die ... -
Super-collimation by axisymmetric diffractive metamirror
(2021-08-05)
Article
Restricted access - publisher's policyWe propose and demonstrate experimentally super-collimation of light beams by an axisymmetric diffractive metamirror—an axisymmetric concentric dielectric ring structure positioned in front of a mirror at a distance of ... -
VUV Frequency Comb by Cavity-Enhanced High Harmonic Generation on Solid Surfaces
(Optical Society of American (OSA), 2019)
Conference report
Restricted access - publisher's policyUsing an enhancement cavity, a sub-Watt power Ti:sapphire femtosecond frequency comb is enhanced to 24 W and 3rd, 5th and 7th harmonics are generated in a non-perturbative manner on the surface of thin AlN layer.
