High efficiency intersubband semiconductor lasers

Coherent light generators – Particular active media – Semiconductor

Reexamination Certificate

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C372S043010, C372S044010, C977S951000

Reexamination Certificate

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07856042

ABSTRACT:
An intersubband quantum cascade laser structure includes multiple coupled laser stages, wherein each stage has a multilayer structure including an electron injector, an active region with at least one quantum well, and an electron reflector. Electrons injected from the injector into the active region at a high energy level relax to a lower energy level with the emission of a photon at, for example, mid-infrared wavelengths. The reflector reflects electrons at the higher energy level at which they were injected and transmits electrons from the lower energy level after emission of a photon. Multiple layers of semiconductor are formed on each side of the multistage structure to provide conduction across the device and to provide optical confinement of the photons emitted.

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S. Ramanuj

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