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Field-enhancing tapered planarized waveguides for THz quantum cascade laser frequency combs
(2022)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2022)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 ...Other Conference Item -
Coherent walk and lock in driven fast-gain frequency-combs
(2023)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 2023)Locking multiple modes into a frequency comb is key for multiple metrological applications, and a great effort has been therefore invested in this challenge over the last decade. The most common techniques are based on either nonlinearities or modulation of the cavity, while the latter is considered the more controllable method to produce frequency combs. The modulation couples cavity modes and creates a lattice in a synthetic dimension ...Other Conference Item -
Surface-emitting THz quantum cascade laser frequency comb with tunable external mirror dispersion compensation
(2023)EPJ Web of Conferences ~ EOS Annual Meeting (EOSAM 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 ...Other Conference Item