12 February 2010 Room-temperature edge and surface-emitting distributed-feedback quantum cascade lasers without top cladding layers
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Proceedings Volume 7616, Novel In-Plane Semiconductor Lasers IX; 761615 (2010) https://doi.org/10.1117/12.841831
Event: SPIE OPTO, 2010, San Francisco, California, United States
Abstract
We demonstrate surface-emitting distributed-feedback (DFB) quantum cascade (QC) lasers - operating in the midinfrared - with double-slit 2nd order DFB gratings which are implemented via the sole patterning of the top metallic layer, directly at the top of the active region. The small-slit design allows one to reduce the high plasmonic losses which would be induced by a standard 2nd order grating. The devices operate at room temperature, in pulsed mode, and exhibit single mode emission at 7.2 μm wavelength. The device far-field consists of an almost single-lobed emission with a low divergence (<1 degree) in the grating direction. This result shows that sub-wavelength patterning of the top metallization layer of mid-infrared surface-plasmon QC lasers allows one to reduce the losses even for higher-order DFB grating devices.
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Adel Bousseksou, Adel Bousseksou, Jean-René Coudevylle, Jean-René Coudevylle, Gangyi Xu, Gangyi Xu, Raffaele Colombelli, Raffaele Colombelli, Carlo Sirtori, Carlo Sirtori, Grégoire Beaudoin, Grégoire Beaudoin, Isabelle Sagnes, Isabelle Sagnes, } "Room-temperature edge and surface-emitting distributed-feedback quantum cascade lasers without top cladding layers", Proc. SPIE 7616, Novel In-Plane Semiconductor Lasers IX, 761615 (12 February 2010); doi: 10.1117/12.841831; https://doi.org/10.1117/12.841831
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