Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combs

We present a new planarized waveguide geometry for THz quantum cascade laser frequency combs with improved waveguide losses, RF and thermal dissipation properties. Ridge devices display broadband free-running comb states, and the THz emission can be further broadened by RF injection. Tapered wavegui...

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Bibliographic Details
Published in:EPJ Web of conferences 2022, Vol.266, p.9007
Main Authors: Senica, Urban, Forrer, Andres, Olariu, Tudor, Micheletti, Paolo, Cibella, Sara, Torrioli, Guido, Beck, Mattias, Faist, Jérôme, Scalari, Giacomo
Format: Article
Language:English
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Summary:We present a new planarized waveguide geometry for THz quantum cascade laser frequency combs with improved waveguide losses, RF and thermal dissipation properties. Ridge devices display broadband free-running comb states, and the THz emission can be further broadened by RF injection. Tapered waveguide devices feature a strong field-enhancement effect, which results in an improved comb performance. This includes free-running comb states with strong single beatnotes up to nearly -30 dBm at 90 K, almost three orders of magnitude stronger than for ridge devices. Improved comb operation is maintained also for high operating temperatures, up to 115 K.
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/202226609007