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Fractal parameters of polyacrylamide (PAM) at different laser fluence: (a) Number of ‘‘lakes’’ for different fractal size vs. the number of laser pulses (n); (b) fractal dimensionality vs. the number of laser pulses (n) for different fractal size. The concentration of small size nanocavities increases at higher laser fluence; (c) fractal dimension vs. fractal size at a different number of laser pulses (lp).
