Influence of cyclic laser pulses on degradation of a tantalum coating

The possibility of simulation of pulsed heat exposure on the surface of Ta coating by low-energy cyclic laser irradiation is considered. In is shown that, at a sufficiently small time interval between the laser pulses, the efficiency of laser radiation absorption by the surface is increased permanently owing to the rise in surface temperature and formation of Ta 2 O 5 and Ta 2 O oxides. This leads to an even greater increase in surface temperature. The laser irradiation regimes resulting in Ta coating degradation and fracture after the action of a large number of laser pulses are ascertained.