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. 2023 Feb 25;16(5):1917. doi: 10.3390/ma16051917

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© 2023 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 (https://creativecommons.org/licenses/by/4.0/).

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Figure A1 — Central hole diameter D opened in a 10-nm-thick Cr film on Si under one pulse irradiation at different pulse energies $E_{p}$ (on the sample). Wavelength of laser pulse was 515 nm, pulse durartion 230 fs, focused by $N A = 0.75$ numerical aperture objective lens. Slanted-view SEM images show evolution of hole opening (diameter D) at different pulse energies $E_{p}$ .