| 摘要 |
A semiconductor laser having a lower clad layer, an active layer, a first upper clad layer and a dry-etching stop layer, all the layers being successively laminated on a compound semiconductor substrate. The semiconductor laser further includes (i) a second upper clad layer, in the form of a ridge, formed above the first upper clad layer, (ii) an etching stop layer present only between the dry-etching stop layer and the second upper clad layer, and (iii) block layers formed at sides of the second upper clad layer.
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