| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor laser whose kink output is sufficiently high. SOLUTION: Mode gain difference between the gain of the zero-th order fundamental mode in a horizontal transverse mode and the gain of the first higher order mode in an optical waveguide is set asΔgain (cm-1). Optical confinement ratio of a fundamental mode light to an active layer constituting the optical waveguide is set asΓ(%), and thenΔgain/Γis made larger than or equal to 85 (cm-1/%).
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