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

Agnès Desfarges-Berthelemot

Alain Barthelemy

Vincent Kermene

Jean-Eucher Montagne

David Sabourdy

Paul Armand

Bruno Esmiller

Joël Benoist

Sandrine Auroux

Julien Guillot

Brigitte Serreault

Jérémy Saucourt

Julien Leval

David Kabeya

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

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

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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Couzeix, France

Agnès Desfarges-Berthelemot