Laser beam combining apparatus

The invention discloses a laser beam combining apparatus. The laser beam combining apparatus comprises a laser array, turning optical elements, a conversion lens, a dispersion element and an external cavity mirror, wherein the laser array comprises M rows of lasers, and each row of lasers comprise N lasers; M*N beams of laser output by the laser array, after passing through the turning optical elements, are emitted in parallel, N beams of laser corresponding to each row of lasers form a coplanar laser array, and planes where M laser arrays are disposed are parallel, and adjacent intervals are specific distances; the N beams of laser in each laser array, after being converged by the conversion lens, are respectively incident to the dispersion element through different angles; and the N beams of laser in each laser array, after passing through the dispersion element, are combined to form one beam of output light, and the M beams of output light corresponding to the M laser arrays, after passing through the external cavity mirror, are output in parallel. According to the invention, since a turning structure is employed, multiple beams of laser output by the laser array are closely arranged, and while the heat dissipation performance of the laser array is improved, higher-efficiency laser beam combination is realized.