https://doi.org/10.1051/epjconf/202328707028
Surface-emitting THz quantum cascade laser frequency comb with tunable external mirror dispersion compensation
Quantum Optoelectronics Group, Institute of Quantum Electronics, ETH Zürich, 8093 Zürich
* Corresponding authors: vdigiorgio@phys.ethz.ch, scalari@phys.ethz.ch
Published online: 18 October 2023
We present a surface emitting THz quantum cascade laser frequency comb with an adjustable chromatic dispersion compensation via a mechanically tunable GTI cavity. Surface emission and high optical feedback into the laser cavity are achieved by a planarized ridge waveguide design with low reflectivity facets and two broadband patch array antennas for coupling to an external mirror (back side) and for power extraction (front side). We demonstrate direct and reproducible manipulation of the frequency comb state, specifically the comb stability and beatnote frequency tuning, by controlling the position of an external movable mirror.
© The Authors, published by EDP Sciences, 2023
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