Centre National De La Recherche Scientifique

Université De Limoges

Compagnie Industrielle Des Lasers Cilas

Astrium Sas

Compagnie Industrielle Des Laser Cilas

Airbus Safran Launchers Sas

Vincent Kermene

Alain Barthelemy

Agnès Desfarges-Berthelemot

Jean-Eucher Montagne

David Sabourdy

Bruno Esmiller

Paul Armand

Brigitte Serreault

Joël Benoist

Julien Guillot

Frédéric Louradour

Sandrine Auroux

Eric Suran

Jérémy Saucourt

Tigran Mansuryan

David Kabeya

Julien Leval

Agnès Desfarges-Berthellemot

A method and system for adjusting the profile of a laser wavefront formed by at least a laser beam to a desired laser wavefront profile, the laser beam or beams presenting random phases and intensities, comprises a mixing module, configured to generate, from interference phenomena among the laser beam or beams, a laser field, a second intensity measuring module configured to measure the mixed intensities of the laser field portions, a calculation unit configured to calculate one or several phase correction values of the phase of the laser beam or the phases of laser beams, from the intensities of the laser beams, the mixed intensities and one or several predetermined target phases, and a phase adjustment module configured to apply the phase correction value or values obtained from the calculation unit to the laser beam phases.

Method and system for adjusting the profile of a laser wavefront

The invention relates to a device for forming laser pulses comprising: an input for a pulsed laser beam; a spatial phase modulator (), arranged on the trajectory of said pulsed laser beam so as to be illuminated thereby; a control means designed to configure said spatial phase modulator so as to emulate a diffraction grating (') having a diffraction efficiency that varies along one spatial direction (s) identified by the intersection of the modulator surface with the diffraction plane (xz); and spatial filtering means () for a light beam diffracted by said grating; whereby a laser pulse (P) at the device input is converted to a train of elementary output pulses (PS) having temporal intensity and/or phase and/or polarization modulation. The invention further relates to a laser pulse forming process based on the use of such a device.

Device and process for forming laser pulses

According to the invention, a plurality of elementary laser beams (f) are generated, the phases of which are adjusted by an electro-optical feedback loop () implementing the matrix equation of a phase-contrast filtering device ().

Method and system for generating a high laser power

Method and laser oscillator for the generation of a laser beam&#x2014;According to the invention with a view to adjusting, inside said laser oscillator (), the phase of each of the N elementary laser beams (FLE., FLE., FLE.N) generated on the basis of said laser oscillator () in such a way that said elementary laser beams are in phase, the deviation between the phase of an individual elementary laser beam (FLE.) and the phases of the N&#x2212;1 other elementary laser beams (FLE., FLE.N) is converted into a level of luminous intensity by means of at least one optical filtering element to which at least a part of each elementary laser beam is directed.

Method and laser oscillator for the generation of a laser beam

The invention relates to a laser cavity with central extraction by polarisation for coherent coupling of intense intra-cavity beams. The laser cavity () according to the invention comprises an extraction unit () with central extraction, which divides the laser cavity () longitudinally into two functional portions (P, P), namely a first portion (P) including the active components (), which amplifies the laser beams (), and a second portion (P) which performs coherent coupling of the laser beams ().

Laser cavity with central extraction by polarisation for coherent coupling of intense intra-cavity beams

According to the invention, the optical signal (SE) is spatially divided into N elementary optical signals (SE., SE., . . . , SE.N), the spectral ranges thereof being adjacent in pairs and forming, substantially by juxtaposition, the spectral range of the optical signal; these N elementary signals are amplified respectively by means of N elementary amplifiers (.N), the spectral ranges thereof respectively comprising the spectral ranges of said N elementary signals; the N amplified elementary signals (Ss., Ss., . . . , Ss.N) are assembled to form an amplified optical signal (Ss), the spectral range thereof substantially coinciding with a predetermined spectral range, and finally the spectral phases of the N initial elementary signals (Ss., Ss., . . . , Ss.N) are adjusted before amplification on the basis of the spectral phase of said amplified signal (Ss).

Method and device for amplifying an optical signal

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Aixe sur Vienne, France

Vincent Kermene