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    • 98. 发明公开
    • Semiconductor device and method of making it
    • Halbleiter-Vorrichtung und Methode zu deren Herstellung。
    • EP0533485A1
    • 1993-03-24
    • EP92308512.0
    • 1992-09-18
    • MITSUBISHI DENKI KABUSHIKI KAISHA
    • Abe,Yuji, c/o Mitsubishi Denki K.K.
    • H01S3/085
    • H01S5/12H01S5/1225H01S5/125H01S5/32391
    • A semiconductor laser includes an active layer (3), a cladding layer (4) disposed on the active layer and made of a semiconductor material having a larger energy band than the material of the active layer. A diffraction grating layer (5) is disposed within the cladding layer in a portion close to the active layer. The diffraction grating layer has a multi-layered structure comprising a stack of sub-layers of a plurality of semiconductor materials which can be selectively etched. An optical resonator is formed by the active layer, the cladding layer, and a second cladding layer sandwiching the active layer with the first cladding layer. The diffraction grating layer includes a portion in which the number of the sub-layers is different from the number of the sub-layers in the remaining portion, whereby portions of different coupling coefficients are formed along the axial direction of the optical resonator which constitutes a major section of the semiconductor laser.
    • 半导体激光器包括有源层(3),设置在有源层上并由具有比有源层的材料更大的能带的半导体材料制成的覆层(4)。 衍射光栅层(5)在靠近有源层的部分内设置在包覆层内。 衍射光栅层具有多层结构,其包括可选择性蚀刻的多个半导体材料的子层堆叠。 光学谐振器由有源层,包层和与第一覆层夹持有源层的第二覆层形成。 衍射光栅层包括子层数与剩余部分中的子层数不同的部分,由此构成不同耦合系数的部分沿构成光谐振器的光谐振器的轴向形成 半导体激光器的主要部分。