Integration of a 2.1-THz Quantum Cascade Laser within an IEEE WM-130 Rectangular Metallic Waveguide

A 2.1-THz quantum cascade laser (QCL) has been integrated into an IEEE standard rectangular metallic waveguide for the first time. A (130 × 65)-μm
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precision micromachined channel within a metallic module was used to form a fundamental WM-130 waveguide, in accordance with IEEE standard 1785.1-2012. We show that single-mode continuous-wave laser emission is obtained, with a Gaussian far-field divergence angle of 9°.