| 摘要 |
A semiconductor laser device has a stem having a mounting surface, a first semiconductor laser element directly or indirectly mounted onto the mounting surface of the stem, the first semiconductor laser element having an emission wavelength and a temperature dependence, and a second semiconductor laser element disposed on top of the first semiconductor laser element, the second semiconductor laser element having an emission wavelength different from the emission wavelength of the first semiconductor laser element and a temperature dependence lower than the temperature dependence of the first semiconductor laser element.
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