Quantum cascade laser

Details Quantum cascade laser Quantum cascade laser

2005-07-26

2005-07-26

Harvey, MinSun Oh (Department: 2828)

Coherent light generators

Particular active media

Semiconductor

C372S043010, C372S044010

Reexamination Certificate

active

06922427

ABSTRACT:
Quantum cascade laser especially comprising a gain region (14) formed from several layers (20) which each comprise:alternating strata of a first type (26) each defining a quantum barrier made of AlInAs and strata of a second type (28) each defining a quantum well made of InGaAs, andinjection barriers (22), interposed between two of the layers (20).The layers of the gain region (14) each constitute an active region extending from one to the other of the injection barriers (22) which are adjacent to it. The strata (26, 28) are dimensioned such that:each of the wells comprises, in the presence of an electric field, at least a first upper subband, a second middle subband and a third lower subband and thatthe probability of an electron being present in the first subband is highest in the vicinity of one of the adjacent barriers, in the second subband in the middle part of the region and in the third subband in the vicinity of the other of the adjacent barriers.

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