Electrically injected visible vertical cavity surface emitting laser diodes

Claim 2

An electrically injected vertical cavity laser diode for emitting light at a visible wavelength comprising: a III-V compound substrate of a first conductivity type connected to a first electrode; a first multiplicity of distributed Bragg reflectors (DBRs) being of the first conductivity type formed above the substrate; an optical cavity formed above the first DBRs and comprising a first optical phase matching spacer layer located adjacent the first DBRs and of the same conductivity, an active region having an active lasing means located adjacent to and above the first spacer layer, and a second optical phase matching spacer layer adjacent to and above the active region and of the opposite conductivity type from the first spacer layer, wherein each spacer layer has a thickness of between one wavelength and three wavelengths of the emitted light; a second multiplicity of distributed Bragg reflectors (DBRs) of the opposite conductivity type formed above the optical cavity; and a second electrode means located above the active region.

Claim 3

The laser of claim 1 wherein the optical phase-matching layers have higher bandgaps than the materials comprising the active lasing means.

Claim 4

The laser of claim 1 wherein the optical phase-matching layers comprise materials which optimize charge carrier injection efficiency into the active region.

Claim 5

The laser of claim 1 wherein the optical phase-matching layers comprise AlInP.

Claim 6

The laser of claim 1 wherein the active lasing means comprises at least one quantum well.

Claim 7

The laser of claim 5 wherein the active lasing means comprises at least one strained quantum well.

Claim 8

The laser of claim 6 wherein the active lasing means further comprises lattice-matched barrier means on either side of the at least one strained quantum well.

Claim 9

The laser of claim 7 wherein various components of the active lasing means comprise InAlGaP compounds.

Claim 10

The laser of claim 8 wherein the composition of the InAlGaP compounds is defined as In x (Al y Ga 1-y ) 1-x P, where 0≦y≦1.

Claim 11

The laser of claim 1 wherein the active lasing means comprises a bulk semiconductor material.

Claim 12

An electrically injected vertical cavity laser diode for emitting light at a visible wavelength comprising: a III-V compound substrate of a first conductivity type connected to a first electrode; a first multiplicity of distributed Bragg reflectors (DBRs) being of the first conductivity type formed above the substrate; an optical cavity formed above the first DBRs and comprising an active region having at least one strained quantum well surrounded by lattice-matched barrier means, a first optical phase matching spacer layer located adjacent the first DBRs and of the same conductivity, and a second optical phase matching spacer layer on the other side of the active region and of the opposite conductivity type, wherein each spacer layer has a thickness of between one wavelength and three wavelengths of the emitted light and the optical phase matching layers have higher bandgaps than the materials comprising the DBR's; a second multiplicity of distributed Bragg reflectors (DBRs) of the opposite conductivity type formed above the optical cavity; and a second electrode means, such that the second electrode means has an opening within it for the transmission of the laser light output.

Claim 13

An electrically injected vertical cavity laser diode for emitting light at a visible wavelength comprising: a III-V compound substrate of a first conductivity type connected to a first electrode; a first multiplicity of distributed Bragg reflectors (DBRs) being of the first conductivity type formed above the substrate; an optical cavity formed above the first DBRs and comprising an active region having at least one strained quantum well surrounded by lattice-matched barrier means, a first optical phase matching spacer layer located adjacent the first DBRs and of the same conductivity, and a second optical phase matching spacer layer on the other side of the active region and of the opposite conductivity type, wherein each spacer layer has a thickness of between one wavelength and three wavelengths of the emitted light and the optical phase matching layers have higher bandgaps than the materials comprising the DBR's; a second multiplicity of distributed Bragg reflectors (DBRs) of the opposite conductivity type formed above the optical cavity; and a second electrode means, such that the second electrode means has an opening within it for the transmission of the laser light output.

Claim 14

The laser of claim 11 wherein the optical phase-matching layers have higher bandgaps than the materials comprising the at least one strained quantum well and the surrounding lattice-matched barrier means.

Claim 15

The laser of claim 11 wherein the optical phased-matching layers comprise AlInP.

Claim 16

The laser of claim 11 wherein the active region is at least one wavelength thick.

Claim 17

The laser of claim 11 wherein various components of the at least one strained quantum well and the surrounding lattice-matched barrier means comprise InAlGaP compounds.

Claim 18

The laser of claim 15 wherein the composition of the InAlGaP compounds is defined as In x (Al y Ga 1-y ) 1-x P, wherein 0≦y≦1.

Claim 19

An electrically injected vertical cavity laser diode for emitting light at a visible wavelength comprising: a III-V compound substrate of a first conductivity type connected to a first electrode; a first multiplicity of distributed Bragg reflectors (DBRs) being of the first conductivity type formed above the substrate; an optical cavity formed above the first DBRs and comprising a first optical phase matching spacer layer located adjacent the first DBRs and of the same conductivity, an active region having an active lasing means located adjacent to and above the first spacer layer, and a second optical phase matching spacer layer adjacent to and above the active region and of the opposite conductivity type form the first spacer layer, wherein each spacer layer is an integral multiple of λ/4n in thickness where λ is the wavelength and n is the refractive index of the spacer and the total thickness of the optical cavity is an integral multiple of λ/2n; a second multiplicity of distributed Bragg reflectors (DBRs) of the opposite conductivity type formed above the optical cavity; and a second electrode means located above the active region.

Claim 20

An electrically injected vertical cavity laser diode for emitting light at a visible wavelength comprising: a III-V compound substrate of a first conductivity type connected to a first electrode; a first multiplicity of distributed Bragg reflectors (DBRs) being of the first conductivity type formed above the substrate; an optical cavity formed above the first DBRs and comprising a first optical phase matching spacer layer located adjacent the first DBRs and of the same conductivity, an active region having an active lasing means located adjacent to and above the first spacer layer, and a second optical phase matching spacer layer adjacent to and above the active region and of the opposite conductivity type form the first spacer layer, wherein each spacer layer is an integral multiple of λ/4n in thickness where λ is the wavelength and n is the refractive index of the spacer and the total thickness of the optical cavity is an integral multiple of λ/2n; a second multiplicity of distributed Bragg reflectors (DBRs) of the opposite conductivity type formed above the optical cavity; and a second electrode means located above the active region.

Claim 21

The laser of claim 17 wherein the optical phase-matching layers have higher bandgaps than the materials comprising the active lasing means.

Claim 22

The laser of claim 17 wherein the optical phase-matching layers comprise AlInP.

Claim 23

The laser of claim 17 wherein the active lasing means comprises at least one quantum well.

Claim 24

The laser of claim 17 wherein the active lasing means comprises at least one strained quantum well.

Claim 25

The laser of claim 17 wherein various components of the active lasing means comprise InAlGaP compounds.

Claim 26

The laser of claim 22 wherein the composition of the InAlGaP compounds is defined as In x (Al y Ga 1-y ) 1-x P, where 0≦y≦1.

Claim 27

The laser of claim 17 wherein the active lasing means comprises a bulk semiconductor material.