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- W2061235531 abstract "Mid-infrared beam shaping concepts are presented, which rely on coherent emission from QCLs. Grating coupled surface emitting quantum cascade ring lasers allow for far-field tuning, ranging from highly symmetric spot- to ringshaped beam patterns, depending on the grating period. In single-mode operation, the devices exhibit low beam divergence, represented by a full width at half maximum of ~3°. Moreover, a tree shaped resonator is investigated, which enables coherent parallel coupling of six laser elements into a single waveguide by means of several Y-junctions. The lasers were investigated in terms of optical power, near and far field characterization. Phase-locking was observed and leads to in-phase emission on both sides of the devices. Both concepts demonstrate the feasibility of high-brightness midinfrared quantum cascade lasers with prospective applications in spectroscopy and high power laser arrays." @default.
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- W2061235531 date "2009-02-12" @default.
- W2061235531 modified "2023-09-28" @default.
- W2061235531 title "Coherence and beam shaping in quantum cascade lasers" @default.
- W2061235531 doi "https://doi.org/10.1117/12.808466" @default.
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