Device for producing a polychromatic light beam by combining a plurality of individual light beams

A device for producing a polychromatic light beam by combining a plurality of individual light beams, the device comprising:

• several distinct laser sources each emitting adapted to emit an individual light beam, said laser sources having respective mean emission wavelengths that are different from one another, and
• a beam combining system comprising:
• a dispersive element that deflects is adapted to deflect each of said beams differently, as a function of the mean emission wavelength corresponding to that beam, and
• a set of deflecting mirrors which, for each laser source, comprises a deflecting mirror associated with said laser source, the deflecting mirror;
• 221;
• adapted to reflect the light beam emitted by said laser source towards the dispersive element, the deflecting mirror being positioned and oriented so that, after deflection by the dispersive element, said light beam is substantially centered on a common axis of propagation, which is the same for the different light beams,
• the device comprising a monolithic part which has at least as many facets as there are laser sources and in which, for each of said deflecting mirrors, the reflecting surface of the deflecting mirror is formed by one of said facets, or by a reflective deposit covering said facet, or by a front face of an individual optical component a rear face of which is attached against said facet,
• each mean emission wavelength being between 2 microns and 15 microns,
• at least two of said mean emission wavelengths being separated from each other by less than 0.3 micron, and
• at least two of said mean emission wavelengths being separated from each other by more than 0.5 micron.