END-FACE-EMITTING PHOTONIC CRYSTAL LASER ELEMENT
First Claim
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1. An end-face-emitting photonic crystal laser element comprising:
- a lower cladding layer comprised of a semiconductor;
an upper cladding layer comprised of a semiconductor;
an active layer including a quantum well layer disposed between the lower and upper cladding layers, the quantum well layer having a plurality of barrier layers and a well layer located between the barrier layers, the barrier layers having an energy band gap smaller than that of any of the lower and upper cladding layers;
a diffraction grating layer having a region disposed between at least one of the lower and upper cladding layers and the active layer;
a lower electrode disposed on a surface of the lower cladding layer; and
an upper electrode disposed on a surface of the upper cladding layer;
wherein, in an XYZ orthogonal coordinate system with X, Y, and Z axes respectively lying in thickness, width, and length directions of the element, the end-face-emitting photonic crystal laser element has a laser light exit surface along an XY plane;
wherein the end-face-emitting photonic crystal laser element has four end faces surrounding the X axis;
wherein one of the end faces is the laser light exit surface; and
wherein, when referring to the surface opposing the laser light exit surface in the end faces as an opposite end face and the remaining pair of end faces as lateral end faces and seeing in the X axis, one end of the upper electrode overlaps the laser light exit surface, the upper electrode and the opposite end face are separated from each other, the upper electrode is separated from both of the lateral end faces, and one end of the active layer overlaps the laser light exit surface.
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Abstract
When an end-face-emitting photonic crystal laser element 10 is seen in an X axis, one end of an upper electrode E2 overlaps a laser light exit surface SF, the upper electrode E2 and an opposite end face SB are separated from each other, the upper electrode E2 is separated from both lateral end faces SR, SL, and one end of an active layer 3B overlaps the laser light exit surface SF.
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Citations
5 Claims
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1. An end-face-emitting photonic crystal laser element comprising:
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a lower cladding layer comprised of a semiconductor; an upper cladding layer comprised of a semiconductor; an active layer including a quantum well layer disposed between the lower and upper cladding layers, the quantum well layer having a plurality of barrier layers and a well layer located between the barrier layers, the barrier layers having an energy band gap smaller than that of any of the lower and upper cladding layers; a diffraction grating layer having a region disposed between at least one of the lower and upper cladding layers and the active layer; a lower electrode disposed on a surface of the lower cladding layer; and an upper electrode disposed on a surface of the upper cladding layer; wherein, in an XYZ orthogonal coordinate system with X, Y, and Z axes respectively lying in thickness, width, and length directions of the element, the end-face-emitting photonic crystal laser element has a laser light exit surface along an XY plane; wherein the end-face-emitting photonic crystal laser element has four end faces surrounding the X axis; wherein one of the end faces is the laser light exit surface; and wherein, when referring to the surface opposing the laser light exit surface in the end faces as an opposite end face and the remaining pair of end faces as lateral end faces and seeing in the X axis, one end of the upper electrode overlaps the laser light exit surface, the upper electrode and the opposite end face are separated from each other, the upper electrode is separated from both of the lateral end faces, and one end of the active layer overlaps the laser light exit surface. - View Dependent Claims (2, 3, 4, 5)
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Specification