Coherent light generators – Particular component circuitry – Optical pumping
Patent
1988-12-06
1990-11-20
Hille, Rolf
Coherent light generators
Particular component circuitry
Optical pumping
357 16, 357 56, 372 43, 372 44, 372 45, 372 46, H01L 3300
Patent
active
049722387
ABSTRACT:
A semiconductor laser device comprising a semiconductor substrate, a multi-layered mesa stripe having an active layer sandwiched between a semiconductor layer of the same conductivity type as that of the active layer and a semiconductor layer of the oppoiste conductivity type to that of the active layer, and formed on the substrate, a burying layer having a refractive index smaller than that of active layer and burying both sides of the mesa stripe, and a pair of electrodes for supplying a current to active layer. The mesa stripe is constructed such that both sides of active layer neighboring to the semiconductor layer of the opposite conductivity type substantially conincide with those of the semiconductor layer, and that active layer has a width decreasing toward the boundary between active layer and semiconductor layer of the same conductivity type, thereby to form a waist portion at the boundary, and in that a protective layer is formed to fill the waist portion, thus covering at least both sides of the active layer.
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Hille Rolf
Kabushiki Kaisha Toshiba
Tran Minh Loan
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