Talukder, Muhammad AnisuzzamanMenyuk, Curtis2018-10-192018-10-192011-08-24Muhammad Anisuzzaman Talukder, Curtis R Menyuk, Temperature-dependent coherent carrier transport in quantum cascade lasers, New Journal of Physics, Volume 13, August 2011, doi: 10.1088/1367-2630/13/8/08302710.1088/1367-2630/13/8/083027http://hdl.handle.net/11603/11612The temperature dependence of coherent carrier transport in quantum cascade lasers (QCLs) is studied in this paper. It was found that coherent carrier transport in QCLs decreases as the temperature increases because the coherence between the injector and active region energy levels decays at a faster rate with increasing temperature. Calculations show that the coherence time decreases by at least a factor of two as the temperature increases from 100 K to room temperature. Electron transport from the injector regions into the active regions and vice versa is a highly coherent process that becomes less efficient with decreasing coherence time and hence becomes less efficient with increasing temperature. As a consequence, when the temperature increases, the population of the upper lasing levels in active regions decreases, the population of the lower lasing levels increases and performance suffers.13 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Attribution 3.0 Unported (CC BY 3.0)quantum cascade lasersTemperature-dependentcoherent carriercarrier injectionelectron–LO-phonon scatteringelectron–interfaceelectron–electron scatteringcoherence timesUMBC High Performance Computing Facility (HPCF)Text