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 2 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°

Amplitude Stabilization of a THz Quantum-Cascade Laser using a Photonic Integrated Circuit

We demonstrate a method to stabilize the output power of a ∼3.3-THz quantum-cascade laser (QCL) using a photonic integrated circuit, consisting of a racetrack resonator (RTR) coupled to a QCL ridge waveguide. Amplitude stabilization was achieved for >300 seconds, without perturbation to the emission spectrum, by dynamically adjusting the electrical bias to the RTR, and hence the coupling between the QCL and RTR