Abstract: Disclosed is a system and a method for generating high-power laser pulses with very high repetition rate. The laser system includes an oscillator capable of generating a source laser beam including a series of sources pulses with femtosecond or picosecond duration at a first repetition frequency no lower than 800 megahertz and an optical amplifier system suitable for receiving and amplifying the series of source pulses at a second repetition frequency that is equal to or a multiple of the first repetition frequency, the multiple being a non-negative integer greater than or equal to two, so as to generate a series of laser pulses with very high repetition frequency.

Abstract: Disclosed is a pulse laser system including an injection system, an optical amplifier system and a beam combiner, the pulse laser system being designed to generate, on the one hand, an amplified pulse of short duration between 100 fs and a few hundred picoseconds and, on the other hand, another amplified pulse of long duration between a few picoseconds and several hundred nanoseconds, the amplified pulse of short duration and the other amplified pulse of long duration being from the same optical amplifier system and the amplified pulse of short duration being temporally overlapped with a relative delay with the other amplified pulse of long duration, the relative delay being less than or equal to the long duration.

Abstract: Disclosed is a method for determining the operational conditions of a method for high-repetition rate femtosecond laser ablation including a first step of determining a set of parameters of a burst of laser pulses adapted to generate an ablation crater in the material, the set of parameters including an intra-burst repetition frequency f between several hundred MHz and 100 GHz, a number N of pulses of the burst of laser pulses equal to a number Nc of heating and ablation pulses, with Nc being defined by the equation Nc=(L2·f)/D, where L represents a test depth and D represents a thermal diffusion coefficient of the material to be ablated, with Nc being greater than or equal to 10, a characteristic total fluence FTchar of the burst of pulses and a characteristic fluence per pulse Fchar=FTchar/Nc below an ablation threshold fluence Fs1 of the material by a single laser pulse.

Abstract: Disclosed is a system and a method for generating high-power laser pulses with very high repetition rate. The laser system includes an oscillator capable of generating a source laser beam including a series of sources pulses with femtosecond or picosecond duration at a first repetition frequency no lower than 800 megahertz and an optical amplifier system suitable for receiving and amplifying the series of source pulses at a second repetition frequency that is equal to or a multiple of the first repetition frequency, the multiple being a non-negative integer greater than or equal to two, so as to generate a series of laser pulses with very high repetition frequency.

Abstract: Friction part in a lubricated medium working at contact pressures above 200 MPa and having a contact surface that is textured and subjected, before or after texturizing, to a case hardening treatment for a tribological function, wherein the surface is subjected to operations for producing a periodic network of micrometric cavities having predefined shapes and sizes and a period adapted to the width of the contact surface in order to promote passage to elastohydrodynamic lubrication regime.

Abstract: A method for marking a surface by controlled periodic nanostructures includes: a step (500) of coding an item of information in the form of an image including values representative of the coded information and a step (506 to 514) of marking, dot by dot, an area of the surface with a polarized laser beam to form oriented nanostructures on or in the surface, by modulating the laser beam's polarization for each marking dot according to the value of a dot of the image. In embodiments, during the marking step, a pulsed laser is utilized with a duration of less than 10×10?12 seconds and an element of polarizing the light coming from the laser source and reaching the surface, designed to polarize the light according to a polarization axis that can vary according to a signal received by the polarization element, is utilized.

Abstract: A method for marking a surface by controlled periodic nanostructures includes: a step (500) of coding an item of information in the form of an image including values representative of the coded information and a step (506 to 514) of marking, dot by dot, an area of the surface with a polarized laser beam to form oriented nanostructures on or in the surface, by modulating the laser beam's polarization for each marking dot according to the value of a dot of the image. In embodiments, during the marking step, a pulsed laser is utilized with a duration of less than 10×10?12 seconds and an element of polarizing the light coming from the laser source and reaching the surface, designed to polarize the light according to a polarization axis that can vary according to a signal received by the polarization element, is utilized.

Abstract: Friction part in a lubricated medium working at contact pressures above 200 MPa and having a contact surface that is textured and subjected, before or after texturizing, to a case hardening treatment for a tribological function, wherein the surface is subjected to operations for producing a periodic network of micrometric cavities having predefined shapes and sizes and a period adapted to the width of the contact surface in order to promote passage to elastohydrodynamic lubrication regime.

Abstract: The device comprises a laser-type coherent light radiation source transmitting ultrashort pulses, a dynamic beam shaping arrangement and an arrangement for using and processing a laser beam. The dynamic beam shaping arrangement comprises an optical system including a part for actively modifying the laser beam wavefront and a detecting part, excepting a phase meter, used for three-dimensionally shaping the beam. These parts are connected by a feed-back circuit and the active modifying part comprises a first fixed or active component and a second active component.