The MLQD4500 from Throlabs is a turnkey quantum cascade laser system that provides emission from a Distributed Feedback (DFB) Laser between 4 - 5 µm. The system provides an optical output power of up to 40 mW. It provides a collimated, vertically polarized, CW output at room temperature. The turnkey laser system consists of a quantum cascade laser head and a touchscreen controller. The laser head measures 114 x 132.8 x 208.4 mm and weighs 2.1 kg.