DIODE LASER COMPRISING AN OPTICAL DEVICE FOR INCREASING THE BEAM DENSITY OF AN OUTPUT LASER BEAM EMITTED BY SAID LASER

摘要

The invention relates to a diode laser containing an optical device (10) which is used to increase the beam density of an output laser beam (12) which is emitted by said laser to the place of an object (16), said laser being made of a plurality of partial beams (8(1), 8(2), ... 8(n)) which are produced by a plurality of diode laser elements (2(1), 2(2), ... 2(n)). The optical device (10) is arranged downstream from the diode laser elements (2(1), 2(2), ... 2(n)) and contains a first Bragg grating volume (18) which only reflects a spectral region (λB(1), ΔλB(l), … λB(2), ΔλB(2), λB(n), ΔλB(n)) of the partial beams (8(1), 8(2), ... 8(n)) emitted by the diode laser elements (2(1), 2(2), ... 2(n)), in the respective diode laser element (2(1), 2(2), ... 2(n)) and only transmits the predominant part of said spectral region (λB(1), ΔλB(l), … λB(2), ΔλB(2), … λB(n), ΔλB(n)). The average wave lengths (λB(1), λB(2), ... λB(n)) of the different partial beams (8(1), 8(2), ... 8(n)), which are respectively filtered from spectral regions (λB(1), ΔλB(1), … λB(2), ΔλB(2), λB(n), ΔλB(n)), are different from each other. The transmitted partial beams (8(1), 8(2), 8(n)) are superimposed in a collinear manner by the first Bragg grating volume (18) in the output laser beam, by means of a second grating (24).