Journal
APPLIED PHYSICS LETTERS
Volume 110, Issue 10, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4978256
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Funding
- 973 Program of China [2014CB339803]
- Major National Development Project of Scientific Instrument and Equipment [2011YQ150021]
- National Natural Science Foundation of China [61404150]
- Shanghai Municipal Commission of Science and Technology [14530711300, 14ZR1447400, 15JC1403800]
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We adopt a self-consistent Maxwell-Bloch method to investigate the energy relaxation process from unsaturated to saturated in the scattering-assisted terahertz quantum cascade laser. In the lasing-establishment process, more nonequilibrium LO phonons are accumulated and more electrons are thermalized. At the same time, more efficient energy relaxation of the saturated situation can be found compared with the unsaturated situation. These phenomena stem from the improved electron transport efficiency across the active region, due to the lasing-induced lifetime reduction of electrons in the upper lasing subband. The simulation results are qualitatively identical with previous experimental results.
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