Patent ID: 9594252
Date: 2017-03-14
CPC Classifications: G02B,H01S

Claim:
1. An LD module comprising: a plurality of laser diodes forming a laser diode array; a plurality of fast axis collimating lenses provided on optical paths of a plurality of laser beams emitted from the corresponding plurality of laser diodes; a plurality of mirrors which reflect the plurality of laser beams emitted from the corresponding plurality of laser diodes, in slow axis directions of the laser beams; and a fast axis focusing lens which focuses the plurality of laser beams reflected by the plurality of mirrors, so that the plurality of laser beams cross each other; the plurality of laser diodes emitting the plurality of laser beams toward the corresponding plurality of mirrors so that intervals between adjacent ones of the laser beams gradually increase, the plurality of mirrors reflecting the plurality of laser beams toward the fast axis focusing lens so that intervals between adjacent ones of the laser beams gradually decrease, the plurality of mirrors being configured to include: respective first mirrors; and respective second mirrors, the first mirrors each reflecting, in a fast axis direction, a corresponding one of the laser beams entering the mirrors; and the second mirrors each reflecting, in a slow axis direction, the corresponding one of the laser beams reflected by the first mirrors, the plurality of laser beams being such that a fast axis of a corresponding one of the laser beams entering the first mirrors is parallel to a slow axis of a corresponding one of the laser beams exiting from the second mirrors.