Surface emission from episide-down short distributed-feedback quantum cascade lasers

Increased coupling is observed in distributed-feedback quantum cascade lasers when placing a shallow second order grating between a continuous surface-plasmon layer and the active region. The combined effect of an air cladding and a metallic layer on the opposite sides of the waveguide increases the...

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Veröffentlicht in:Optics express 2008-08, Vol.16 (16), p.11920-11929
Hauptverfasser: Schartner, Stephan, Austerer, Maximilian, Schrenk, Werner, Andrews, Aaron M, Klang, Pavel, Strasser, Gottfried
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Sprache:eng
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Zusammenfassung:Increased coupling is observed in distributed-feedback quantum cascade lasers when placing a shallow second order grating between a continuous surface-plasmon layer and the active region. The combined effect of an air cladding and a metallic layer on the opposite sides of the waveguide increases the overlap with the grating region resulting in calculated coupling coefficients up to 100 cm(-1). The waveguide design was implemented by Au thermo-compression bonding after grating formation and subsequent backside processing of ridges with air claddings. Lasers as short as 176 microm show single-mode behavior with a side-mode-suppression-ratio of 20 dB and thresholds (10 kA/cm(2)) as well as output powers (> 150 mW) close to Fabry-Pérot device performances are reached for 360 microm long devices.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.16.011920