Multiquantum barrier laser having high electron and hole reflectivity of layers
First Claim
1. A semiconductor laser unit having an active layer and cladding layers, wherein said active layer is interposed between said cladding layers, comprising:
- a multiquantum barrier layer including well layers and barrier layers disposed in one or both of said cladding layers, or disposed in one or both of said cladding layers close to said active layer, whereinsaid well and barrier layers include at least one first pair of a well layer and a barrier layer and at least one second pair of a well layer and a barrier layer, said first pair of well and barrier layers having different characteristics from said second pair of well and barrier layers to provide relatively high reflectivities with respect to electrons and/or holes at a position close to a Γ
-point in a reciprocal lattice space and at a position close to any one of primary symmetrical points.
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Accused Products
Abstract
It is an object of the present invention to provide a highly efficient semiconductor laser unit having excellent temperature characteristics, in which electrons or holes are suppressed from overflowing from the active layer to the cladding layers while the threshold of current density is maintained low. The present invention is to provide a semiconductor laser unit fundamentally composed of an active layer and cladding layers in which the active layer is interposed between the cladding layers the semiconductor laser unit comprising: a multiquantum barrier layer including well layers and barrier layers disposed between the active layer and the cladding layers or disposed in the cladding layers close to the active layer, wherein the well and barrier layers have a high reflectivity with respect to the electrons and holes at a position close to Γ-point in the reciprocal lattice space, and also the well and barrier layers have a high reflectivity with respect to the electrons and holes at a position close to at least one of the primary symmetrical points.
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Citations
27 Claims
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1. A semiconductor laser unit having an active layer and cladding layers, wherein said active layer is interposed between said cladding layers, comprising:
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a multiquantum barrier layer including well layers and barrier layers disposed in one or both of said cladding layers, or disposed in one or both of said cladding layers close to said active layer, wherein said well and barrier layers include at least one first pair of a well layer and a barrier layer and at least one second pair of a well layer and a barrier layer, said first pair of well and barrier layers having different characteristics from said second pair of well and barrier layers to provide relatively high reflectivities with respect to electrons and/or holes at a position close to a Γ
-point in a reciprocal lattice space and at a position close to any one of primary symmetrical points. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor laser unit, comprising:
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an active layer; cladding layers between which said active layer is interposed; and a multiquantum barrier layer disposed between said active layer and one of said cladding layers, or disposed in one or both of said cladding layers close to said active layer, wherein said multiquantum barrier layer includes at least one first pair of a well layer and a barrier layer and at least one second pair of a well layer and a barrier layer, said first pair of well and barrier layers having different characteristics from said second pair of well and barrier layers to provide relatively high reflectivities with respect to electrons and/or holes at a plurality of primary symmetrical points in a reciprocal lattice space, or at respective positions close to the plurality of primary symmetrical points. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A semiconductor laser unit, comprising:
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an active layer; cladding layers between which said active layer is interposed; and a multiquantum barrier disposed between said active layer and one of said cladding layers, or disposed in one or both of said cladding layers close to said active layer, wherein said multiquantum barrier layer includes at least one first pair of a well layer and a barrier layer and at least one second pair of a well layer and a barrier layer, said first pair of well and barrier layers having different characteristics from said second pair of well and barrier layers to provide relatively high reflectivities with respect to electrons and/or holes at a Γ
-point in a reciprocal lattice space or at a position close to said Γ
-point in the reciprocal lattice space and at at least one of primary symmetrical points in the reciprocal lattice space except said Γ
-point, or at a point close to the primary symmetrical point. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A semiconductor laser unit having an active layer and cladding layers, wherein said active layer is interposed between said cladding layers, comprising:
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laminated multiquantum barrier layers of different characteristics and of the AlGaInP material system and including a lamination of a pair of a GaInP well layer and an AlInP barrier layer, said laminated multiquantum barrier layers including well layers and barrier layers disposed between said active layer and one of said cladding layers, or disposed in one or both of said cladding layers close to said active layer, wherein said well and barrier layers have relatively high reflectivities with respect to electrons and/or holes at a position close to a Γ
-point in a reciprocal lattice space, and said well and barrier layers have a high reflectivity with respect to the electrons and holes at a position close to at least one of the primary symmetrical points. - View Dependent Claims (20, 21)
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22. A semiconductor laser unit, comprising:
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an active layer; cladding layers between which said active layer is interposed; and laminated multiquantum barrier layers of different characteristics and of the AlGaInP material system and including a lamination of a pair of a GaInP well layer and an AlInP barrier layer, said laminated multiquantum barrier layers disposed between said active layer and one of said cladding layers, or disposed in one or both of said cladding layers close to said active layer, wherein said laminated multiquantum barrier layers have relatively high reflectivities with respect to electrons and/or holes at a plurality of primary symmetrical points in a reciprocal lattice space, or at respective positions close to the plurality of primary symmetrical points. - View Dependent Claims (23, 24)
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25. A semiconductor laser unit, comprising:
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an active layer; cladding layers between which said active layer is interposed; and laminated multiquantum barrier layers of different characteristics and of the AlGaInP material system and including a lamination of a pair of a GaInP well layer and an AlInP barrier layer, said laminated multiquantum barrier layers disposed between said active layer and one of said cladding layers, or disposed in one or both of said cladding layers close to said active layer, wherein said laminated multiquantum barrier layers having relatively high reflectivities with respect to electrons and/or holes at a Γ
-point in a reciprocal lattice space or at a position close to said Γ
-point in the reciprocal lattice space and at at least one of primary symmetrical points in the reciprocal lattice space except said Γ
-point, or at a point close to the primary symmetrical point. - View Dependent Claims (26, 27)
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Specification