Semiconductor laser device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorYasuhiro Kobayashi
Life of this patent
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Abstract
A semiconductor laser device includes: active layer; first cladding layer, which is formed on the active layer and is made of (AlX1Ga1−X1)Z1In1−Z1P (where 0≦X1≦1 and 0<Z1<1) of a first conductivity type; current blocking layer, which is formed on the first cladding layer and is made of (AlYGa1−Y)Z2In1−Z2P (where 0≦Y≦1 and 0<Z2<1) of a second conductivity type and has striped region; and second cladding layer, which is formed at least in the striped region and is made of (AlX2Ga1−X2)Z3In1−Z3P (where 0≦X1≦1 and 0<Z3<1) of the first conductivity type. X1, X2 and Y have relationships represented as Y>X1 and Y>X2. Saturable absorption region absorbing laser light produced from the active layer is formed in part of the active layer under the current blocking layer.
Claims5
A semiconductor laser device comprising:
- an active layer;
- a first cladding layer, which is formed on the active layer and is made of (AlX1Ga1−X1)Z1In1−Z1P(where 0≦X1≦1 and 0<Z1≦1) of a first conductivity type;
- a striped region provided on the first cladding layer;
- a current blocking layer, which is formed on both sides of the striped region, provided on the first cladding layer and is made of (AlYGa1−Y)Z2In1−Z2P (where 0≦Y≦1 and 0<Z2<1) of a second conductivity type;
- and
- a second cladding layer, which is formed at least in the striped region and is made of (AlX2Ga1−X2)Z3In1−Z3P (where 0≦X2≦1 and 0<Z3<1) of a first conductivity type,
- wherein X1, X2 and Y have relationships represented as Y>X1 and Y>X2,
- wherein a laser light is produced from a region in a lower portion of the striped region in the active layer, and
- a saturable absorption region at the active layer for absorbing laser light produced from the active layer is provided directly below the current blocking layer in the active layer, and is provided beside and in contact with the region, which produces the laser light, in the active layer.
Dependencies are inferred from the claim text.