| 摘要 |
The semiconductor laser device 1 A has a semiconductor laser array 3 including a plurality of active layers 2 arranged in parallel along a slow direction, and outputs laser beams from the front end face 2 a side of the active layers 2. The semiconductor laser device 1 A comprises a collimating lens 5 that collimates laser beams L 1 outputted from the respective rear end faces 2 b of the active layers 2 within a plane orthogonal to the slow axis, and a reflecting mirror 9 that feeds back parts of the laser beams L 2 outputted from the collimating lens 5 to the respective active layers 2 via the collimating lens 5.
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