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. 2020 Mar 2;10:3819. doi: 10.1038/s41598-020-60828-3

Figure 2.

Figure 2

Cross section of part of a 2-layer Fresnel lens written with a Bessel beam using halfscan technique at power of 90 mW. Diameter of Fresnel lens is 2 mm and thickness of each layer is 100 μm. The dotted line is the centre of the Fresnel lens.