The authors demonstrate a broadband, heterogeneous terahertz frequency quantum cascade laser by exploiting an active region design based on longitudinal optical‐phonon‐assisted interminiband transitions. They obtain continuous wave laser emission with a threshold current density of ∼120 A/cm 2 , a dynamic range of ∼3.1, and an emission spectrum spanning from 2.4 to 3.4 THz at 15 K.
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Li et al. (2018) studied this question.
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