Extraction of the electron excess temperature in terahertz quantum cascade lasers from laser characteristics

Nathalie Lander Gower, Shiran Levy, Silvia Piperno, Sadhvikas J. Addamane, John L. Reno, Asaf Albo

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We propose a method to extract the upper laser level's (ULL's) excess electronic temperature from the analysis of the maximum light output power (P max) and current dynamic range ΔJ d = (J max - J th) of terahertz quantum cascade lasers (THz QCLs). We validated this method, both through simulation and experiment, by applying it on THz QCLs supporting a clean three-level system. Detailed knowledge of electronic excess temperatures is of utmost importance in order to achieve high temperature performance of THz QCLs. Our method is simple and can be easily implemented, meaning an extraction of the excess electron temperature can be achieved without intensive experimental effort. This knowledge should pave the way toward improvement of the temperature performance of THz QCLs beyond the state-of-the-art.

Original languageEnglish
Pages (from-to)1725-1733
Number of pages9
Issue number10
StatePublished - 3 Apr 2024

Bibliographical note

Publisher Copyright:
© 2023 the author(s), published by De Gruyter, Berlin/Boston.


Research funding: The authors would like to acknowledge the Israel Science Foundation (ISF 1755/23); Israel Ministry of Science and Technology; Center for Integrated Nanotechnologies; U.S. Department of Energy; Sandia National Laboratories; National Nuclear Security Administration for its grant.

FundersFunder number
U.S. Department of Energy
National Nuclear Security Administration
Sandia National Laboratories
Center for Integrated Nanotechnologies
Israel Science FoundationISF 1755/23
Ministry of science and technology, Israel


    • LO-phonon
    • electron temperature
    • terahertz quantum cascade lasers


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