Continuum has developed the FX-IR difference frequency generator to enhance its Sunlite EX optical parametric oscillator (OPO). It bolts to the OPO and generates tunable mid-IR wavelengths ranging from 1450 to 5000 nm with linewidths <0.15 cm-1. The generator and OPO can be controlled by a single PC, which facilitates programmable and repeatable scanning. It can be used in any combination with the FX-1 frequency doubler and the FX-UV difference frequency generator. The FX-IR's IR output is suitable for spectroscopy, lidar and other applications.