| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor laser device capable of emitting a laser beam in a prescribed direction and changing an emission direction thereof.SOLUTION: A semiconductor laser device LD1 comprises an edge-emitting semiconductor laser element 10A and a collimator lens 20. The semiconductor laser element 10A comprises a lower clad layer, an upper clad layer, an active layer, a photonic crystal layer, and a plurality of drive electrodes for supplying driving current to a plurality of regions in the active layer, and emits a plurality of laser beams LB each in a different direction from each of the positions corresponding to a plurality of regions on a light emission end surface LES . The collimator lens 20 has curvatures of a front surface 20a and a rear surface 20b so that an optical path length from each emission position to a front side principal plane on a light emission end surface LES becomes equal, and refracts each of the plurality of laser beams LB emitted from the semiconductor laser element 10A in a plane parallel to a thickness direction of the semiconductor laser element 10A. |
