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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 monolithic coupling scheme with two active waveguides merging into a single waveguide is presented for a mid-infrared GaAs/AlGaAs quantum cascade laser. The rapid development of unipolar quantum cascade lasers (QCLs) creates a basis for a broad variety of technological applications. Farfield patterns of the identical laser with a truncated mixing region result in a different superposition of the...
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