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We present a monolithic solution to extract efficiently light from terahertzquantum cascade lasers with metal-metal waveguides suitable for broadbandfrequency comb applications. The design is optimized for a bandwidth of 500 GHzaround a center frequency of 2.6 THz. A five-fold increase in total outputpower is observed compared to standard metal-metal waveguides. The extractorfeatures a single-lobed far-field pattern and increases the frequency combdynamical range to cover more than 50 % of the laser dynamic range. Frequencycomb operation up to a spectral bandwidth of 670 GHz is achieved.

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