A diode laser apparatus includes a plurality of spaced apart diode lasers, each of the diode lasers situated and configured to emit a diode laser beam substantially parallel to each other diode laser beam in an emission plane in a first direction, and a plurality of reflectors situated with respect to the diode lasers and configured to receive respective diode laser beams and to reflect the respective diode laser beams substantially parallel and out of the emission plane at a small angle therewith in a second direction such that the reflected diode laser beams are in a stacked configuration.