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InAs‐based quantum cascade lasers (QCLs) operating near 20 µm are demonstrated. A double metal waveguide fabricated by transfer of the laser active region onto a host InAs substrate has been employed in these devices. The threshold current density of 1.6 kA/cm 2 at 80 K is lower than that of InP‐based QCLs emitting in the same spectral region. The lasers operated in pulsed mode up to 170 K.
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Bahriz et al. (2013) studied this question.
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