4.6 Article

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

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OPTICS EXPRESS
卷 16, 期 16, 页码 11920-11929

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OPTICAL SOC AMER
DOI: 10.1364/OE.16.011920

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  1. Austrian Science Fund (FWF) [F 2503] Funding Source: researchfish

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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 mu m 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-Perot device performances are reached for 360 mu m long devices. (C) 2008 Optical Society of America.

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