Observation of various material surfaces irradiated and cratered with focused ArF laser lights

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It is necessary to know the ablation rates of various material surfaces under the irradiation of intense UV laser lights, as one of the ablating beams, when we design the future inertial fusion reacotrs driven by big lasers. So that, we irradiated various materials with a UV laser light. The laser wavelength, the pulse width and the maximum repetition rate were 193 nm, 20 ns, and 50 Hz. Irradiated materials were LiPb, Pb as the wet wall candidates of the inertial fusion reactors, while W, C, Al 2 O 3 , SiC and SiC-Si composite material as the dry wall candidates were also irradiated. The changes of teh irradiated surface conditions under different irradiation conditions were observed with three different kinds of optical diagnostic tools. The structures of the produced craters were investigated precisely. We could know how strong the tungsten was against such laser ablations, compared with LiPb or Pb etc..

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