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. 2015 Dec 10;5:17929. doi: 10.1038/srep17929

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Copyright © 2015, Macmillan Publishers Limited

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(a) Variation of the spatial period of ripples and grooves as a function of the laser pulse energy E₀, for two different values of the laser pulse number: N = 20 and N = 100. (b) Variation of the spatial period of ripples and grooves as a function of the number of pulses N for three different values of the laser pulse energy: E₀ = 9.5 μJ, E₀ = 19 μJ and E₀ = 48 μJ. The two solid lines represent linear fits to the experimental data (note that data are reported on a lin-log plot). The legend R and G indicate ripples and grooves, respectively.