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A monolithic coupling scheme for mid-infrared InP-based quantum cascade laser arrays is presented. The tree-shaped resonator exhibits phase-locking, which leads to in-phase emission from the coupled branches and a high level of modal control.
Mid-infrared beam shaping is demonstrated by using grating coupled surface emitting quantum cascade ring lasers. The devices allow for far-field tuning, ranging from highly symmetric spot-to ring-shaped beam patterns, depending on the grating period.
A detailed study of inter-subband energy transitions in AlP quantum wells (QWs) based on valley-symmetry and effective-mass measurements using THz cyclotron resonance and quantum transport in AlP/GaP QWs is presented. We show that AlP/GaP QWs can serve as the basis for THz devices emitting in the 30-60 mum wavelength range that is inaccessible by other systems because of phonon band absorption.
Fe-implantation is used to create a high-resistivity layer at the rear facet of an InP-based quantum cascade laser (lambda = 3.9 mum), subsequently coated with a metallisation of Cr (5 nm) and Au (200 nm). The coatings lead to a 3.7-fold increase of front-facet power and a 20-30% reduction in threshold current density compared to uncoated lasers.
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