| 摘要 |
A semiconductor laser is herein disclosed which comprises an active layer 21 and SCH layers which sandwich the active layer 21 from upper and lower sides, wherein the SCH layer comprises a multi-layer structure of 2 or more layers 22,24,23,25, and this multi-layer structure is constituted so that the band gaps of the respective layers may increase as the multi-layer structure is apart from the active layer.
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