Features of simultaneous ground- and excited-state lasing in quantum dot lasers

The lasing spectra and light-current ( L-I ) characteristics of an InAs/InGaAs quantum dot laser emitting in the simultaneous lasing mode at the ground- and excited-state optical transitions are studied. Lasing and spontaneous emission spectra are compared. It is shown that ground-state quenching of...

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Bibliographic Details
Published in:Semiconductors (Woodbury, N.Y.) N.Y.), 2012-02, Vol.46 (2), p.231-235
Main Authors: Zhukov, A. E., Maximov, M. V., Shernyakov, Yu. M., Livshits, D. A., Savelyev, A. V., Zubov, F. I., Klimenko, V. V.
Format: Article
Language:English
Subjects:
Comparative analysis
CURRENT DENSITY
EMISSION
EMISSION SPECTRA
EXCITED STATES
GALLIUM ARSENIDES
GROUND STATES
INDIUM ARSENIDES
LASERS
Magnetic Materials
Magnetism
MATERIALS SCIENCE
Physics
Physics and Astronomy
Physics of Semiconductor Devices
QUANTUM DOTS
QUENCHING
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Summary:The lasing spectra and light-current ( L-I ) characteristics of an InAs/InGaAs quantum dot laser emitting in the simultaneous lasing mode at the ground- and excited-state optical transitions are studied. Lasing and spontaneous emission spectra are compared. It is shown that ground-state quenching of lasing is observed even in the absence of active region self-heating or an increase in homogeneous broadening with growth in the current density. It is found that the intensities of both lasing and spontaneous emission at the ground-state transition begin to decrease at a pump intensity that significantly exceeds the two-level lasing threshold. It is also found that different groups of quantum dots are involved in ground- and excited-state lasing.
ISSN:1063-7826
1090-6479
DOI:10.1134/S1063782612020285