Abstract: A device for processing an input light beam comprising at least one optical pulse having an original duration, forms the input light beam into a predetermined shape. The device comprises an optical input; a stretching device, with a view to temporally elongating the duration of the optical pulse and thus transmitting a temporally stretched radiation; a compressing device, with a view to at least partially restoring the original duration of the optical pulse; and an optical output. The processing device also comprises a shaping device comprising at least one multi-plane converter placed upstream of the compressing device, which is configured to process the temporally stretched radiation with a view to forming the output beam into the predetermined shape.

Abstract: A multi-passage cavity made up of the assembly of a planar mounting and first and second reflective optical elements each having a main face arranged opposite one another, the main face of at least one of the optical elements being microstructured to modify the phase of incident luminous radiation that is reflected several times on each of the optical elements to form transformed radiation, the multi-passage cavity includes precisely three assembly interfaces.

Abstract: Device (1) for processing light radiation, comprising: —an optical input (2) for receiving an input beam from an optical source (3) and for propagating in the device (1) an input radiation, an optical output (4) for emitting an output beam having predetermined spatial parameters, an MPLC conversion device (5) which is arranged between the optical input (2) and the optical output (4) and which is configured to spatially separate, in a separation plane (7), the input radiation into useful radiation, in a target mode, which is propagated to the optical output (4) and into an interference radiation. The processing device also comprises at least one device (8) for blocking the interference radiation, which blocking device is arranged in the separation plane (7) so that it does not contribute to the output beam.