Thales

Paul Jougla

Sébastien Laux

Bertrand Forestier

François Lureau

Christophe Simon-Boisson

Mathilde Charbonneau

Olivier Casagrande

Sebastien Laux

Francois Lureau

An M-output, where M&#x3e;1, chirped pulse amplification chain that includes a stretcher of stretching factor tx_stretch, M amplifiers in cascade, M output compressors respectively placed at the output of each amplifier, wherein it comprises: a partially compressing device placed between the stretcher and the first amplifier, this partially compressing device having at least one partial compression factor, the one (or more than one) partial compression factor(s) being lower than tx_stretch, and an optical switch configured to receive a beam output from the stretcher and to direct it directly to the first amplifier of the cascade or to the partially compressing device depending on the output compressor chosen among the output compressors.

Multi-output chirped amplification chain

A device for the sampling of a pulsed laser beam of high energy, typically greater than 1 J, and of large size, having a diameter typically greater than 1 cm, combined with a compressor, comprises, upstream of the compressor: a sample-taking device provided with a sampling diopter capable of transmitting T % of the pulsed laser beam, T being greater than 90, and of reflecting (1&#x2212;T) % of the pulsed laser beam, the reflected beam being called sampled beam, an afocal capable of reducing the size of the sampled beam, the compressor having a determined useful aperture, a device for reinjecting the reduced sampled beam into this useful aperture.

Device for sampling a large, high-energy laser beam combined with a compressor comprising a sample-taking device with a sampling diopter

A device for amplifying a multi-wavelength pulsed laser beam is provided, which comprises: a solid amplifying medium with two planer faces, a front face and a reflecting rear face; and a device for cooling the amplifying medium by the rear face. The front face of the amplifying medium is tilted relative to its rear face by a first non-zero tilt and the device further comprises a trapezoidal prism, with an input face and an output face which form between them a second non-zero tilt, the first and second tilts being such that the beams of each wavelength are parallel to one another at the output of the prism.

Device for amplifying a laser pulse having improved temporal contrast

The invention relates to a dual-field (NF and WF) imaging system comprising an optronic detector () and an optical combination of narrow-field focal length Fhaving, an optical axis a front lens, a narrow-field entrance pupil situated in the vicinity of the front lens, a real wide-field entrance pupil, that is to say situated upstream of the front lens, an intermediate focal plane (IFP). The optical combination has, on the optical axis, the following refractive groups: a convergent front group Gof focal length F, where F&#x3c;F/2, this group Gcomprising the front lens, a divergent field-change group Gthat can move along the optical axis, this group being situated upstream of the IFP in NF configuration and downstream of the IFP in WF configuration, a relay group Gimaging the IFP on the focal plane of the detector. The imaging system has a cooled IR2/IR3 detector and since the refractive groups have lenses, at least three different materials including CaFare used for the lenses of the front group G

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Paris, France

Paul Jougla