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Quantum cascade lasers (QCLs)[1] are widely used sources of coherent radiation based on intersubband (ISB) transitions in quantum wells (QWs) with particularly good performance in the mid-IR spectral region. Due to their operation mechanism, QCLs would benefit from improved confinement in the upper lasing state by the introduction of 3D-confined quantum dots (QDs)[2] or quantum dashes (QDashes), which...
We present the latest advances in the field of broadband quantum cascade lasers for applications requiring broad and gapfree emission or a wide tuning range in the mid-IR. We show a QCL emitting gapfree radiation in pulsed mode from 6 to 7.7 µm capable of room-temperature continious wave operation with output powers of 170 mW at −30°C. We also demonstrate the possibility to replace the glowbar in...
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