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Mid-IR interband cascade lasers will be reviewed. Advantages include 3–6 μm spectral coverage, wallplug efficiency up to 18% when operated in cw mode at ambient temperature, and ultra-low threshold drive power.
We report a 7-stage narrow-ridge interband-cascade laser emitting at λ ≈ 3.5 µm that produces up to 592 mW of cw power, with a wallplug efficiency of 10.1% and M2 = 3.7 at T = 25 °C.
We report that various recent design modifications and optimizations have produced significant advances in the performance of interband cascade lasers (ICLs) for the mid-IR spectral band. Figure 1 illustrates the progression with time of ICL pulsed threshold current densities, as compared to some of the lowest reported results for quantum cascade lasers. All of the ICL devices were standard 150-µm-wide...
In this paper we demonstrate RT second-harmonic generation around 2.7 μm with peak output powers close to 10 μW at current densities of around 2 kA/cm2. We also discuss possible device structures for wavelengths around 3.5 μm and a future development strategy for single-mode, two-color tunable laser sources.
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