Coherent light generators – Particular component circuitry – Optical pumping
Patent
1989-09-08
1991-02-05
Davie, James W.
Coherent light generators
Particular component circuitry
Optical pumping
357 60, 357 68, 372 46, 372 50, 372 92, H01L 3300
Patent
active
049909720
ABSTRACT:
A semiconductor light emitting device comprises a semiconductor substrate of a first conductivity type; an electric current blocking layer formed on one main face of the substrate and including a semiconductor of a second conductivity type opposite to the first conductivity type and having an opening reaching the main face; a first semiconductor layer of the first conductivity type formed on the electric current blocking layer and a portion of the main face on which the opening is disposed; a second semiconductor layer stacked on the first semiconductor layer and forming a hetero-junction together with the first semiconductor layer; a semiconductor layer for electrode of the second conductivity type formed on the second semiconductor layer and having a window reaching the second conductor layer in a position corresponding to the opening; a first electrode metallic layer formed on the electrode semiconductor layer except for the window; and a second electrode metallic layer formed on the other main face of the substrate. The window has a flat shape composed of a substantially circular or rectangular shape and has a size substantially less than the size of the opening. Portions of the first and second semiconductor layers corresponding to the opening function as a light emitting region by flowing an electric current between the first and second electrode metallic layers, and a light generated from the light emitting region is outputted through the window in a direction substantially perpendicular to the substrate.
REFERENCES:
patent: 4675875 (1987-06-01), Takamiya
patent: 4706101 (1987-11-01), Nakamura et al.
patent: 4819243 (1989-04-01), Opschoor
Onodera Noriaki
Satoh Shiro
Davie James W.
Ricoh & Company, Ltd.
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