Vertical cavity surface emitting laser having improved light output function
First Claim
1. A laser diode comprising:
- a bottom mirror comprising an electrically conducting material;
a first conductive spacer situated above said bottom mirror;
a light emitting layer;
a second conductive spacer situated above said light emitting material;
a top mirror comprising a plurality of mirror layers of a semiconducting material of a first conductivity type above said second conductive spacer in which adjacent layers have different indexes of refraction, and an aperture defining layer comprising an aperture region and an implant region, said aperture region comprising an aperture semiconducting material of said first conductivity type, said implant region surrounding said aperture region and comprising an implant material that alters the reflectivity of said mirror layers in said implant region.
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Accused Products
Abstract
A laser diode that includes a light guiding structure that improves the light-output-versus-current curve by altering the multiple spatial modes of the laser diode. A laser diode according to the present invention includes a bottom mirror constructed on an electrically conducting material, an active region constructed from a first conductive spacer situated above the bottom mirror, a light emitting layer, and a second conductive spacer situated above the light emitting layer. The laser diode also includes a top mirror constructed from a plurality of mirror layers of a semiconducting material of a first conductivity type that are located above the second conductive spacer. The adjacent mirror layers have different indexes of refraction. One or more of the top mirror layers is altered to provide an aperture defining layer that includes an aperture region that alters the spatial modes of the device.
6 Citations
8 Claims
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1. A laser diode comprising:
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a bottom mirror comprising an electrically conducting material;
a first conductive spacer situated above said bottom mirror;
a light emitting layer;
a second conductive spacer situated above said light emitting material;
a top mirror comprising a plurality of mirror layers of a semiconducting material of a first conductivity type above said second conductive spacer in which adjacent layers have different indexes of refraction, and an aperture defining layer comprising an aperture region and an implant region, said aperture region comprising an aperture semiconducting material of said first conductivity type, said implant region surrounding said aperture region and comprising an implant material that alters the reflectivity of said mirror layers in said implant region. - View Dependent Claims (2, 3, 4)
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5. A method for fabricating a light-emitting device, said method comprising the steps of:
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depositing a first semiconducting layer of a first conductivity type;
depositing a light-emitting layer on said first semiconducting layer;
depositing a second semiconducting layer of a second conductivity type on said light-emitting layer;
depositing an aperture defining layer on said second semiconducting layer, said aperture defining layer comprising a semiconducting material of said second conductivity type;
defining an aperture region in said aperture defining layer;
implanting an area around said aperture region with impurities to create a region having a reflectivity that is different from that in said aperture region, said aperture region remaining free of said impurities; and
depositing a third semiconducting layer of said second conductivity type on said second semiconducting layer after said implanting step. - View Dependent Claims (6, 7, 8)
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Specification