Flame quenching resulting from flame-wall interactions (FWIs) is important in several thermochemical processes of practical relevance, such as internal combustion engines. Even though FWIs are restricted to regions close to walls of a combustion chamber, they are crucial for wall heat fluxes and unburned hydrocarbon emissions. This review starts with the discussion about the role of laser diagnostics in FWIs. Following a description of current understanding of FWIs, the focus is on applying

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... cal diagnostics to investigate parametric sensitivities that influence flame quenching at walls and to better understand the influence of non-adiabaticity upon the thermo-chemical states in FWIs. The review closes with a discussion of issues and implications for future experimental researches.