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Beam steering in mid-infrared emitting quantum-cascade lasers

: Kinzer, M.; Fuchs, F.; Hugger, S.; Hinkov, B.; Bronner, W.; Lösch, R.; Aidam, R.; Yang, Q.K.


Titterton, D.H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Technologies for Optical Countermeasures VII : 22-23 September 2010, Toulouse, France
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7836)
ISBN: 978-0-8194-8354-6
Paper 78360R
Conference "Technologies for Optical Countermeasures" <7, 2010, Toulouse>
Fraunhofer IAF ()
beam steering; lateral modes; infrared emission; time-resolved spectroscopy; quantum cascade laser

We report large beam steering effects, observed in the far-field pattern of InP-based mid-infrared quantum-cascade lasers along the slow axis. Changing the temperature by a few degrees around room temperature or varying the drive current strongly affects the lateral direction of the output beam. The position of maximum intensity in the far-field-distribution changes by more than 20°. This beam steering effect is correlated to changes in the lateral mode distribution, as revealed by time-resolved spectroscopy of the lasing spectrum.