Fishing – trapping – and vermin destroying
Patent
1991-06-07
1992-09-22
Chaudhuri, Olik
Fishing, trapping, and vermin destroying
427 50, 427133, 427 23, 372 44, 372 46, 357 17, H01L 2120, H01L 21203, H01L 21265, H01L 2130
Patent
active
051496704
ABSTRACT:
A method of producing a semiconductor light emitting device includes forming a stripe-shaped mesa on a surface of a semiconductor substrate; epitaxially growing a multiple layer structure including at least a first cladding layer, an active layer, a second cladding layer, and a cap layer so that the active layer and cap layer have mesas corresponding to the mesa of the substrate; depositiong photoresist on the cap layer to form a flattened surface; removing the photoresist to expose the mesa of the cap layer; removing a portion of the cap layer using the photoresist remaining on the cap layer as a mask to make the surface of the cap layer approximately flat; depositing a thin film to be used as a mask for proton or ion bombardment on the cap layer and on the remaining photoresist; removing the remaining photoresist and the thin film on the remaining photoresist; and bombarding the cap layer with protons and ions using the remaining thin film on the cap layer as a mask to produce higher resistivity regions adjacent the remaining thin film than directly below the remaining thin film. Therefore, highly reliable semiconductor laser devices having good and uniform characteristics can be realized.
REFERENCES:
patent: 4433417 (1984-02-01), Burnham et al.
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patent: 4546480 (1985-10-01), Burnham et al.
patent: 4728628 (1988-03-01), Fiddyment et al.
Dyment et al., "Proton-Bombardment Formation Of Stripe-Geometry Heterostructure Laser For 300 K CW Operation", Proceedings of the IEEE, Jun. 1972, pp. 726-728.
Scifres et al., "Mesa Waveguide GaAs/GaAlAs Injection Laser Grown By Metalorganic Chemical Vapor Deposition", Applied Physics Letters, Jun. 1981, pp. 915-917.
Chaudhuri Olik
Mitsubishi Denki & Kabushiki Kaisha
Trinh Loc Q.
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