Laser beam amplification device

A device for amplifying a multi-wavelength laser beam, the device comprising:

• a. a first solid active laser medium having a first refractive index, the first active laser medium having at least two plane faces among a front face suitable for receiving the beam to be amplified, called the incident beam, and a reflective rear face, the front face being inclined with respect to the rear face at a first non-zero inclination, the rear face being suitable for being cooled, and
• b. a second solid active laser medium having a second refractive index, the second active laser medium having at least two plane faces among a front face suitable for receiving the beam reflected by the rear face and refracted by the front face of the first active laser medium, and a reflective rear face, the front face being inclined with respect to the rear face at a second non-zero inclination, the rear face being suitable for being cooled, the second active laser medium being arranged along the path of the beam reflected by the rear face and refracted by the front face of the first active laser medium, the first inclination, the second inclination and the orientation of the second active laser medium being such that the sub-beams of each wavelength, forming the output beam of the second active laser medium, are parallel to each other at the output of the second active laser medium.