ATMOSPHERIC THERMOMETRY FOR METALLIC SURFACES BY LASER-INDUCED 2ND-HARMONIC GENERATION

To the best of our knowledge we report the first demonstration of surf ace thermometry using laser-induced second-harmonic generation (SHG) o n a realistic metallic surface at atmospheric pressure. The surface is probed with a pulsed infrared laser beam and the SHG signal is monito red in reflection. For metallic silver, the SHG signal is found to be temperature dependent in the 25-120 degrees C range. The current accur acy of the method is +/-5 degrees C. Future work with platinum should permit the application of SHG thermometry to much higher surface tempe ratures. (C) 1996 Optical Society of America