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A set of room temperature low threshold current densities of a mid-infrared InP-based quantum cascade lasers (QCLs) have been demonstrated. Threshold current densities as low as 1.7kA/cm 2 for multi-mode Fabry-Perot QCLs at an emission wavelength of 7.6μm and 0.9kA/cm 2 for single-mode distributed feedback QCLs at an emission wavelength of 7.7μm have been achieved at 300K. The results...
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