Apparatus for synthesizing laser beams

摘要

Laser beams are synthesized by offsetting in different positions in the direction of the fast axis beam bundles radiated from semiconductor lasers, converging the optical axes of the beam bundles in the fast axis view, and introducing the beam bundles into an optical fiber after converging them in the directions of the fast and slow axes. A convergent angle transforming optical system is disposed further upstream of the upstream-most position in the positions where the optical axes of the beam bundles converged in the fast axis view intersect in the fast axis view. The whole beam bundle formed of the beam bundles converged in the fast axis view is passed through the convergent angle transforming optical system so that the angle of convergence of the whole beam bundle or part of the beam bundles is made smaller in the fast axis view, and introduced into the optical fiber.