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. 2021 Jan 25;11(2):305. doi: 10.3390/nano11020305

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Experimental setup. Right inset shows the simulation result of the interference pattern on the irradiation plane. fs laser: femtosecond laser; DOE: diffractive optical element; L1 and L2: achromatic lenses.