Semiconductor laser device
First Claim
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1. A semiconductor laser device, comprising:
- a GaAs semiconductor substrate of one of a first conductivity type and a second conductivity type opposite to said first conductivity type;
a first cladding layer on said GaAs semiconductor substrate of an AlGaInP system crystal of the same conductivity type as said substrate and having a lattice substantially matching the lattice of said GaAs semiconductor substrate;
an active layer on said first cladding layer;
a second cladding layer on said active layer of an AlGaInP system crystal, said second cladding layer being of a conductivity type opposite to the conductivity type of said substrate and having a lattice substantially matching the lattice of said GaAs semiconductor substrate; and
a p-type barrier cladding layer in the one of said first and second cladding layers which is p-type and/or between said one cladding layer and said active layer of an AlGaInP system crystal or an AlInP system crystal,said p-type barrier cladding layer having a thickness to substantially block transmission of electrons therethrough, having tensile strain and also having band gap energy larger than that of said one cladding layer.
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Abstract
On an n-type GaAs semiconductor substrate, an n-type cladding layer formed of AlGaInP system crystal almost in lattice matching with the semiconductor substrate, an active layer and a p-type cladding layer formed of AlGaInP system crystal almost in lattice matching with the semiconductor substrate are formed, and a p-type barrier cladding layer formed of AlGaInP system crystal or AlInP system crystal is provided in the p-type cladding layer. The p-type barrier cladding layer has a thickness through which electrons are almost not transmitted, has tensile strain, and also has band gap energy larger than that of the p-type cladding layer.
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Citations
21 Claims
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1. A semiconductor laser device, comprising:
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a GaAs semiconductor substrate of one of a first conductivity type and a second conductivity type opposite to said first conductivity type; a first cladding layer on said GaAs semiconductor substrate of an AlGaInP system crystal of the same conductivity type as said substrate and having a lattice substantially matching the lattice of said GaAs semiconductor substrate; an active layer on said first cladding layer; a second cladding layer on said active layer of an AlGaInP system crystal, said second cladding layer being of a conductivity type opposite to the conductivity type of said substrate and having a lattice substantially matching the lattice of said GaAs semiconductor substrate; and a p-type barrier cladding layer in the one of said first and second cladding layers which is p-type and/or between said one cladding layer and said active layer of an AlGaInP system crystal or an AlInP system crystal, said p-type barrier cladding layer having a thickness to substantially block transmission of electrons therethrough, having tensile strain and also having band gap energy larger than that of said one cladding layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 21)
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15. A semiconductor laser device, comprising:
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a GaAs semiconductor substrate of a first conductivity type; a first cladding layer formed on said GaAs semiconductor substrate and formed of an AlGaInP system crystal of the first conductivity type which has a lattice substantially matching the lattice of said GaAs semiconductor substrate; an active layer formed on said first cladding layer; a second cladding layer formed on said active layer as an AlGaInP system crystal of a second conductivity type which is opposite to said first conductivity type and having a lattice substantially matching the lattice of said GaAs semiconductor substrate; and a plurality of p-type barrier cladding layers provided separately from each other in the one of said first and second cladding layers which is p-type and/or between said p-type cladding layer and said active layer, and formed of an AlGaInP system crystal or an AlInP system crystal; each of said plurality of p-type barrier cladding layers having a thickness through which almost no electrons are transmitted, having tensile strain and also having a band gap energy larger than that of said p-type cladding layer. - View Dependent Claims (16, 17, 18, 19)
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20. A semiconductor laser device comprising an n-type cladding layer, an active layer and a p-type cladding layer in this order, at least one p-type barrier cladding layer having a thickness to substantially block the transmission of electrons, tensile strain and band gap energy larger than said p-type cladding layer, said p-type barrier cladding layer provided in said p-type cladding layer and/or between said p-type cladding layer and said active layer.
Specification