Emission spectra of terahertz quantum cascade laser |
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| Authors: | A V Antonov V I Gavrilenko A V Ikonnikov K V Maremyanin A A Lastovkin S V Morozov D V Ushakov Yu G Sadofyev and N Samal |
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| Institution: | (1) Nanophotonics, School of Engineering-Emerging Technology, University of Tabriz, Emam Khomeini Bolv. 29 Bahman, Tabriz, 51666, Iran;(2) Faculty of the Electrical and Computer Engineering, University of Tabriz, Emam Khomeini Bolv. 29 Bahman, Tabriz, 51666, Iran |
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| Abstract: | We calculated energy levels, wave functions, and energies of radiative transitions in terahertz quantum cascade lasers based
on GaAs/Al0.15Ga0.85As heterostructures. Current-voltage characteristics and current dependences of laser radiation intensity were measured, and
the maximum operating temperatures reaching 85 K were determined. Radiation spectra of quantum cascade lasers were measured
for different temperatures, and the effect of intensity “pumping” from low-frequency modes to high-frequency modes was found
to happen in the case of an increase in the current and time delay of the signal capture, which is explained by heating of
the sample during a pulse of the current. Application of the lasers for registration of impurity photoconductivity signals
in semiconductor heterostructures was demonstrated. |
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