Coherent light generators – Particular active media – Semiconductor
Patent
1991-12-03
1993-05-18
Epps, Georgia Y.
Coherent light generators
Particular active media
Semiconductor
372 45, 372 23, 372 97, 372 44, H01S 319
Patent
active
052127060
ABSTRACT:
A laser diode assembly provides multiple output beams from multiple p-n junctions in a multiplicity of stacked laser diodes with at least one tunnel junction. A semiconductor substrate has a multiplicity of superposed semiconductor laser stacks thereon each having an active layer sandwiched between p and n layers, and at least one pair of adjacent semiconductor laser stacks has a tunnel junction therebetween. When a potential is applied across the ohmic contacts on the outer surface of the substrate and the outer surface of the uppermost semiconductor laser stack, lasing is produced in the semiconductor stacks to form multiple beams. The tunnel junction may be provided by highly doped p.sup.+, n.sup.+ layers between the stacks, or it may be provided by highly doped abutting p.sup.+, n.sup.+ surface portions in the adjacent stacks. Tunnel junctions may be provided at the interfaces between all of the stacks, or between all but one pair of the adjacent stacks. The assembly may be edge emitting or surface emitting, and it may include single or multiple quantum well configurations and distributed feedback configuration.
REFERENCES:
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Epps Georgia Y.
University of Connecticut
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