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Ability to generate three (a, b) and four foci (c, d) behind the phantom. (a, c) - calculated intensity distributions; (b, d) - IR measured intensity in the focal plane (z=130 mm). The contours are given with increments of 2 W cm−2. The data were obtained for the powers of 11 W (for 3 foci) and 5.8 W (for 4 foci) and for the time of heating 0.2 s.
