Abstract-Waveguide Embedding of a Double-Metal 1.9-THz Quantum Cascade Laser: Design, Manufacturing, and Results

 Matthias Justen. Keita Otani,  Dana Turčinková, Fabrizio Castellano,  Mattias Beck, Urs U. Graf, Denis Büchel, Michael Schultz,  Jérôme Faist

http://ieeexplore.ieee.org/document/8025815/


We present the details of a coupling structure to embed a 1.9-THz double-metal quantum cascade lasers (QCLs) into a 120-μm-wide full-height rectangular waveguide. We describe the split-block manufacturing of the waveguide coupler together with a diagonal feed horn and present power and beam shape measurements of two different devices. The two devices differ in coupling factor, which can be chosen in a wide range by the mounting position of the QCL. Our waveguide embedding allows coupling of a large fraction of the laser power into the waveguide and the subsequent horn antenna emitting with a large Gaussian mode content, enabling efficient integration into a diffraction limited optics setup. This is illustrated by a self-mixing experiment and by using the embedded QCL as a local oscillator in a heterodyne receiver.

Abstract-Electrically tunable terahertz quantum cascade lasers based on a two-sections interdigitated distributed feedback cavity

Dana Turčinková¹, Maria Ines Amanti^1,2, Giacomo Scalari¹, Mattias Beck¹ andJérôme Faist¹
http://scitation.aip.org/content/aip/journal/apl/106/13/10.1063/1.4916653
1 ETH Zurich, Institute for Quantum Electronics, Auguste-Piccard-Hof 1, 8093 Zurich, Switzerland
2 Univ. Paris Diderot, Lab. Matererk iaux et Phenomenes Quantiques, F-75205 Paris, France
Appl. Phys. Lett. 106, 131107 (2015); http://dx.doi.org/10.1063/1.4916653

The continuous electrical tuning of a single-mode terahertz quantum cascade laser operating at a frequency of 3 THz is demonstrated. The devices are based on a two-section interdigitated third-order distributed feedback cavity. The lasers can be tuned of about 4 GHz at a constant optical output power of 0.7 mW with a good far-field pattern.

Abstract-Continuous tuning of terahertz distributed feedback quantum cascade laser by gas condensation and dielectric deposition

http://apl.aip.org/resource/1/applab/v102/i18/p181113_s1?isAuthorized=no
Dana Turčinková, Maria Ines Amanti, Fabrizio Castellano, Mattias Beck, and Jérôme Faist

We present the continuous tuning of a terahertz quantum cascade laser based on 3rd order distributed feedback. This source provides a single mode emission with low dissipation power (∼400 mW) and milliwatt-level output power. The laser is tuned by nitrogen-gas condensation or by dielectric deposition. The former method offers a reversible, reproducible, and continuous mode-hop free tuning over 25 GHz at a frequency of ∼3.3 THz (Δf/f ∼ 0.75%). The latter is convenient for precise post-process targeting of a desired frequency.

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