Operation of a quantum-cascade laser based on the In0.52Al0.48As–In0.53Ga0.47As∕InP material is demonstrated at a frequency of 3.6terahertz. The active region is based on a bound-to-continuum transition combined with an optical phonon extraction. The optical waveguide exploits a combination of metallic and dielectric confinement. Threshold current density of 460A∕cm2 at 10K and a maximum operating temperature of 45K are achieved.
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Ajili et al. (2005) studied this question.
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