期刊
NEW JOURNAL OF PHYSICS
卷 24, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac5b41
关键词
quantum cascade laser; LO phonon scattering; terahertz science
资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/J002356/1, EP/P021859/1, EP/T034246/1]
This work discusses terahertz quantum cascade laser designs that utilize resonant phonon mechanism for assisting the lasing process. The study investigates whether higher energy separation would be more beneficial for high temperature performance compared to the commonly used resonant value. A density matrix model is employed for reliable cut-off temperature estimation, and design improvements are presented to enhance material gain and achieve 10-50 K higher cut-off temperature.
In this work we discuss terahertz quantum cascade laser designs that employ resonant phonon mechanism to assist the lasing process. We investigate whether the higher energy separation would be more beneficial for high temperature performance than commonly used resonant value of 36 meV (in GaAs). We show that our density matrix model can be used for reliable cut-off temperature estimation and we present design improvement of several exemplary structures by enhancing their material gain to attain 10-50 K higher cut-off temperature.
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