Broadband monolithic extractor for metal-metal waveguide based terahertz quantum cascade laser frequency combs

We present a monolithic solution to extract efficiently light from terahertz quantum cascade lasers with metal-metal waveguides suitable for broadband frequency comb applications. The design is optimized for a bandwidth of 400 GHz around a center frequency of 2.5 THz. A five-fold increase in total o...

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Bibliographic Details
Published in:Applied physics letters 2017-07, Vol.111 (2)
Main Authors: Rösch, Markus, Benea-Chelmus, Ileana-Cristina, Bonzon, Christopher, Süess, Martin J., Beck, Mattias, Faist, Jérôme, Scalari, Giacomo
Format: Article
Language:English
Subjects:
Applied physics
Broadband
Design optimization
Far fields
Feature extraction
Quantum cascade lasers
Waveguides
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Summary:We present a monolithic solution to extract efficiently light from terahertz quantum cascade lasers with metal-metal waveguides suitable for broadband frequency comb applications. The design is optimized for a bandwidth of 400 GHz around a center frequency of 2.5 THz. A five-fold increase in total output power is observed compared to standard metal-metal waveguides. The extractor features a single-lobed far-field pattern and increases the frequency comb dynamical range to cover more than 50% of the laser dynamic range. Frequency comb operation up to a spectral bandwidth of 670 GHz is achieved.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4993786