Amplification device comprising means parallelepiped laser amplifier and pumping means comprising lamps which.

Amplification device comprising an amplifying medium (2) of parallelepiped shape, means of cooling the amplifying medium and lamps comprising circulating a fluid (20) cooling and pumping means comprising lamps (5) emitting in a range frequency a first useful for amplification and a second susceptible radiation degrading the amplifier, characterized in that lamps are integrated into a jacket (3) which absorbs at least part of the second radiation and comprising openings of different sections for radiation circulating a fluid (20) cooling.