The Laser-Diagnosing Advanced Propulsion Research Laboratory aims to characterize the fundamental physics and chemistry embedded in various energy conversion processes under extreme conditions (e.g., supercritical, ultra-high vacuum and ultra-low gravity) that have been underexplored or completely uncharted in the past. The lab is meticulously tailored to study gas-phase, liquid phase, solid phase and interfacial thermodynamics, chemical kinetics, transport properties, fluid dynamics, as well as their coupling under both turbulent, laminar, premixed and non-premixed conditions, with a range of highly advanced diagnostic platforms, including a high-pressure constant volume combustion chamber, a high-pressure counter flow burner, a high-pressure swirl burner, a high-pressure particle burner. The testing platforms are coupled with advanced diagnostics such as multiple high-speed cameras, multiple ICCD imaging systems, Nd: YAG laser, dye laser, Schlieren imaging system, etc. These platforms enable laser-induced fluorescence (LIF), laser-induced incandescence (LII), and particle image velocimetry (PIV) that are particularly valuable to probe into the fundamentals involved in extreme energy conversion process.