Injectorless quantum-cascade (QC) lasers, for the first time comparable to conventional QC lasers, are presented. The samples are based on InP and the active region is designed as a four-level staircase, realised in the strain-compensated material system Ga0.4In0.6As/Al0.56In0.44As. Low threshold current densities and a maximum operating temperature of 350 K have been achieved, due to an optimised design. At 77 K the wavelength is about 10 µm, while threshold current densities of 0.9 kA/cm2 have been observed, which compare well with those of conventional QC lasers in this wavelength region.
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Friedrich et al. (2005) studied this question.
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