1. Xu, X. and Song, K.H., 1997, "Radiative Transfer between the Pulsed Laser and the Target in the Presence of Laser-Induced Plasma," J. Heat Transfer, Vol. 119, pp. 502-508.

2. Song, K.H., and Xu, X., 1997, "Mechanisms of Absorption in Pulsed Excimer Laser-Induced Plasma," Appl. Phys. A, Vol. 65, pp. 477-485.

3. Song, K.H. and Xu, X., 1998, "Explosive Phase Transformation in Pulsed Laser Ablation," Appl. Surf. Sci., Vol. 127, pp. 111-116.

4. Xu, X., Chen, G., and Song, K.H., 1998, "Experimental and Numerical Investigation of Heat Transfer and Phase Change Phenomena during Excimer Laser Interaction with Nickel," Int. J. Heat Mass Transfer.

5. Xu, X., and Liu, C.R., 1997," Laser Coating Technology for Tribological Applications," 4th International Conference on Manufacturing Technology, December 1997.

The goal of this research is to investigate coating and coating removal techniques using high power lasers. A pulsed UV excimer laser is used to evaporate coating materials. We have shown that coatings with thicknesses on the order of a few micrometers to tens of micrometers can be efficiently removed by laser pulses, without causing damages to the underlying materials. On the other hand, the laser evaporated vapor plume can also be deposited on a substrate in a vacuum chamber to form a coating layer. Our current research is focused on producing thin ceramic coatings on various substrates.

Experimental and numerical studies are conducted to study the thermal physical phenomena occurring during the materials removal process. Experimental techniques are developed to measure the temperature of the target material and the laser-evaporated plume, radiative properties and velocity of the laser-evaporated plume, the pressure at the target surface during the laser evaporation process, and the materials removal rate. A numerical model is established to compute the laser evaporation process. The calculated temperature, pressure and materials removal rates are verified by the experimentally determined values.

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