3 February 2009 Coherence and beam shaping in quantum cascade lasers
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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.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Mujagić, E. Mujagić, L. K. Hoffmann, L. K. Hoffmann, S. Schartner, S. Schartner, M. Nobile, M. Nobile, H. Detz, H. Detz, D. Andrijasevic, D. Andrijasevic, M. Austerer, M. Austerer, W. Schrenk, W. Schrenk, A. M. Andrews, A. M. Andrews, P. Klang, P. Klang, M. P. Semtisiv, M. P. Semtisiv, W. T. Masselink, W. T. Masselink, G. Strasser, G. Strasser, "Coherence and beam shaping in quantum cascade lasers", Proc. SPIE 7230, Novel In-Plane Semiconductor Lasers VIII, 723015 (3 February 2009); doi: 10.1117/12.808466; https://doi.org/10.1117/12.808466


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