Laser-diode bar lighting device

Abstract

A lighting device () including at least one laser-diode bar with a plurality of emitters arranged adjacently to one another in a first direction and able to emit sub-beams during operation. The sub-beams having a lower beam divergence in a first direction that forms a slow-axis direction than in a second direction that forms a fast-axis direction and is perpendicular to the first direction. At least some of the emitters having a height offset in relation to the other emitters. A fast collimation means positioned behind the at least one laser-diode bar in a beam-propagation direction perpendicular to the slow-axis direction and the fast-axis direction. Beam transformation means positioned behind the fast-axis collimation means in the beam-propagation direction and designed to rotate the sub-beams through 90° as they pass thorough said means. A prism array positioned behind the beam transformation means in the beam-propagation direction and a number of prism means corresponding to the number of emitters and arranged adjacently to one another in the first direction, each of which has an incident light face and a light output face for one of the sub-beams. The incident light faces and/or the light output faces of the prism means, through which the sub-beams with a height offset pass, are designed such that the Poynting effect can be corrected by the parallelization of said sub-beams.