Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
75 (1994), S. 8085-8089
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The reflectivity of tungsten-carbon (W-C) multilayers, heated by 7 ns Nd-YAG laser pulses was measured using soft x-ray radiation at 4.4 nm. The reflectivity permanently increased and the Bragg angle decreased after heating the multilayer at fluences of 0.3 J/cm2. The reflectivity increase was achieved in a narrow domain of heating fluences. A quantitative model based on laser absorption and heat transport, that explains the melting phenomenon of tungsten and the heating to a temperature where graphitization is possible in the carbon layers, is presented. The two phenomena: (a) increase in x-ray reflectivity and (b) expansion of the multilayer mirror can be explained by the laser heating. The improvement of reflectivity is caused by the smoothening of the tungsten layers due to melting, while the change in the spacing is attributed to the carbon phase transition (graphitization).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.356552
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