Abstract We present the results of two-wave mixing experiments1 performed in the temperature range between 20 and 125°C with BaTiO3, crystals grown at Hughes. We determine the temperature dependence of the two-wave mixing gain and we study the variation with temperature of the response time for an intensity close to 1 W/cm2 and a grating wavelength of 0.8 μm. Our experiments demonstrate that the high two-wave mixing gain typical of BaTiO3, at room temperature can be preserved up to 125°C while the response time is strongly improved with respect to its room temperature value (Figures 1 and 2). This implies a twentyfold increase in the sensitivity of BaTiO3. Recent experiments aimed at further increasing the sensitivity will be discussed.