The growth and measurement of terahertz quantum cascade lasers

Results are presented for two GaAs/AlGaAs quantum cascade laser (QCL) structures that emit at frequencies of 2.59 and 2.75 THz. Both structures have a nominally identical, bound-to-continuum active region design, and the difference between their emission frequencies is interpreted as resulting from...

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Bibliographic Details
Published in:Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2008-04, Vol.40 (6), p.1859-1861
Main Authors: Khanna, Suraj P., Chakraborty, Subhasish, Lachab, Mohamed, Hinchcliffe, Nicholas M., Linfield, Edmund H., Davies, A. Giles
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Lasers
Light emitting devices
Molecular beam epitaxy
Optics
Physics
Quantum cascade lasers
Quantum wells
Semiconductor lasers
laser diodes
Superlattices
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Summary:Results are presented for two GaAs/AlGaAs quantum cascade laser (QCL) structures that emit at frequencies of 2.59 and 2.75 THz. Both structures have a nominally identical, bound-to-continuum active region design, and the difference between their emission frequencies is interpreted as resulting from small differences in the gallium and aluminium growth rates, which were measured both before and after laser growth using a pyrometric spectrometry technique. The same technique allows the QCL growth itself to be monitored real-time, and drifts in growth rates identified.
ISSN:1386-9477
1873-1759
DOI:10.1016/j.physe.2007.08.126