Coherent light generators – Particular active media – Semiconductor
Patent
1984-11-28
1990-06-26
Sikes, William L.
Coherent light generators
Particular active media
Semiconductor
H01S 319
Patent
active
049378368
ABSTRACT:
A semiconductor laser device, includes (1) a first semiconductor layer having a mesa-shaped stripe, (2) a current blocking layer applied on the first semiconductor layer except the top of the mesa-shaped stripe of the first semiconductor layer, the current blocking layer allowing the electric current to flow only through the mountain-shaped region, (3) a first cladding layer applied on the current blocking layer and on the top of the mountain-shaped stripe of the first semiconductor layer, and having charge carriers of the same type with that of the first semiconductor layer, (4) an active layer applied on the first cladding layer, and (5) a second cladding layer applied on the active layer, and having charge carriers of the type opposite to that of the first cladding layer, wherein the first cladding layer, the active layer and the second cladding layer compose a multilayer structure of the double heterojunction type for the laser excitation. The first cladding layer is thin so that the laser light excited in the active layer reaches the current blocking region that is outside the mesa-shaped region while it hardly reaches the first semiconductor layer through the mesa-shaped region.
Kayashi Hiroshi
Morimoto Taiji
Yamamoto Saburo
Yano Seiki
Epps Georgia Y.
Sharp Kabushiki Kaisha
Sikes William L.
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