Abstract: A H2/air premixed flat flame burner as calibra tion source for CARS temperature and species concentration measurements was esta blished. Temperatures for various stoichiometries along longitude and transv erse have been systematically measured by N2 CARS. The results indicate that difference between measurement temperature and the corresponding theoretical value is about 3.4 percent. Whereas temperature is nearly invariant beyond 1 mm above the burner surface, the associated error is around 1.8 percent.