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Fig. 1. (Color online) Scanning electron microscopy images of the samples fabricated by femto-second laser micro-machining method: (a) with double-void defects of diameters of 472 µm and 487 µm and the distance of 452 µm (Sample I); (b) with double-void defects of diameters of 382 µm and 385 µm and the distance of 323 µm (Sample II); (c) and (d) with single-void defect of the diameter of 266 µm (Sample III) and 156 µm (Sample IV), respectively.
New Phys.: Sae Mulli 2021;71:305~309 https://doi.org/10.3938/NPSM.71.305
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