Quantum Cascade Laser (QCL) system operating in the mid-infrared (mid-IR) region suitable for planar laser-induced ¿uorescence (PLIF) measurements of carbon dioxide (CO2) in combustion and reacting-¿ow environments. The system must include all necessary components to operate as a turnkey laser source for spectroscopic diagnostics. This system will support ongoing research within NETL’s Turbines & Combustion portfolio.