Coherent light generators – Particular component circuitry – Optical pumping
Patent
1988-11-28
1990-07-10
LaRoche, Eugene R.
Coherent light generators
Particular component circuitry
Optical pumping
357 17, 357 4, 357 30, 372 44, 372 45, 372 50, G06F 1110, H03M 1312, H01L 29161, H01L 3300
Patent
active
049410253
ABSTRACT:
A quantum well structure comprises a layered semiconductor definitive of a quantum well profile that contains at least two subbands characterized by an enhanced carrier conductivity difference between the subbands. The doping of the layered structure establishes a carrier population only within the lower-energy subband. A dynamic carrier population inversion between subbands is established by applying an external electric field in the plane of the quantum well. Light output from the structure results from intersubband transitions. In one device embodiment, the carriers comprise electrons, the subband profile is within the conduction band, and the quantum well profile comprises a nested quantum well profile. In another device embodiment, the carriers comprise holes, the subband profile is within the valence band, and the quantum well profile comprises a strained quantum well profile. One important application for such devices is as a far-infrared or submillimeter light source.
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Bell Communications Research Inc.
Falk James W.
LaRoche Eugene R.
Shingleton Michael B.
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