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Current- and Temperature-Induced Beam Steering in 7.8- {\mu} m Emitting Quantum-Cascade Lasers

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5 Author(s)
Borislav Hinkov ; Fraunhofer Inst. for Appl. Solid State Phys., Freiburg ; Frank Fuchs ; Wolfgang Bronner ; Klaus Kohler
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We report large current- and temperature-induced beam-steering effects, observed in the far-field distribution of InP-based quantum-cascade lasers emitting around 7.8-mum wavelength operated in pulsed mode. Changing the temperature within a narrow range of ~10degC around room-temperature leads to a change in the direction of the output beam, as given by the central lobe in the far-field intensity distribution, from +11deg to -13deg as measured relative to the resonator axis. This beam steering effect is linked to changes in the lateral mode distribution, as revealed by time-resolved spectroscopy of the lasing spectrum.

Published in:

IEEE Journal of Quantum Electronics  (Volume:44 ,  Issue: 11 )