Coherent light generators – Particular active media – Semiconductor
Patent
1990-01-30
1991-05-21
Epps, Georgia
Coherent light generators
Particular active media
Semiconductor
357 4, 357 17, H01S 319
Patent
active
050181572
ABSTRACT:
In a vertical cavity laser, such as an InP based vertical laser, the energy bandgap in the active region can be made equal to or larger than the bandgap in a semiconductor mirror stack by virtue of degenerate doping in the stack sufficient to suppress electronic band-to-band optical absorption. For example, the active region of an InP based laser can be lattice-matched GaInAs, GaInAsP, or a multiple quantum well structure composed of layers of InP and GaInAs--with the mirror stack composed of alternating layers of InP and degenerately doped n-type lattice-matched GaInAs or GaInAsP.
Deppe Dennis G.
Dupuis Russell D.
Schubert Erdmann F.
AT&T Bell Laboratories
Caplan D. I.
Epps Georgia
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