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Recently, significant progress has been made in the development of short-wavelength quantum-cascade lasers (QCLs) emitting in the 3–4 µm wavelength range [1], where many molecular species of interest have their strongest rotational-vibrational absorption bands. A laser designed for gas sensing applications must have a narrow spectral width in order to differentiate between the fine features of the...
Sensitive single-pass transmission measurements for probing the electron distribution of Quantum Cascade lasers under an applied bias are used to extract the intersubband nonparabolicity and single-pass gain of a λ∼10μm Quantum Cascade laser.
We report the metal-organic vapour phase epitaxy growth of quantum cascade lasers (QCLs) in both the GaAs-AlGaAs and InGaAs-AlInAs-InP materials systems. The GaAs based sample shows an increased emission wavelength relative to an equivalent design grown by molecular beam epitaxy, which we attribute to interfacial grading in the metal-organic vapour phase epitaxy device. The InP-based QCL (λ~8.5μm)...
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