One of the most important parameters of any laser, is the lifetime of the laser levels. To obtain the lifetime of laser levels in terahertz quantum cascade lasers, we need to calculate different scattering mechanisms. In this paper, with calculating the different scattering mechanisms and obtaining the lifetime of laser levels, the many-body effects on the lifetimes are considered. The results of this paper show the importance of considering the many-body effects in calculations, to obtain a more accurate value of the lifetime of laser levels in quantum cascade laser.

Keywords: Many-body effect, Scattering, Lifetime of levels, Terahertz quantum cascade lasers

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