Coherent light generators – Particular component circuitry – Optical pumping
Patent
1990-06-05
1992-05-05
Hille, Rolf
Coherent light generators
Particular component circuitry
Optical pumping
357 16, 357 17, 372 45, H01L 2980
Patent
active
051112558
ABSTRACT:
A high transconductance field effect transistor is realized by controlling the doping level in a conducting channel buried beneath a heterointerface. In one exemplary embodiment, a channel comprising an undoped, high mobility, narrow band gap quantum well in combination with an intermediate band gap layer is formed beneath a heterointerface. The heterojunction interface is between a wide band gap layer and the quantum well region. A charge sheet having the same conductivity type as the wide bandgap layer is formed near the heterointerface. Advantageously, the transconductance is enhanced by conduction in the undoped filled quantum well region.
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Kiely Philip A.
Taylor Geoffrey W.
AT&T Bell Laboratories
Hille Rolf
Laumann Richard D.
Loke Steven
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