Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 21, Issue 7, Pages 1077-1082Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/BF03027657
Keywords
ultra short pulse laser; laser machining; incubation effect; laser-induced ripple
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Picosecond mid-IR USPL induced Surface damage on a Gallium Phosphate (GaP) and Calcium Fluoride (CaF2) is reported. A semiconductor Gap and a dielectric material CaF2, that are transparent over 3 similar to 10 mu m, were exposed to one picosecond mid-IR light (4.7 mu m) to investigate laser-induced surface morphological changes on the target. The initiation of damage along the polishing scratch line of Gal? and the random location of damage digs on the CaF2, suggests that the mid-IR picosecond laser-induced damage on targets started from intrinsic surface defects. Multiple Pulse irradiations produced periodic corrugated Surface structures (ripples) perpendicular to the polarization of light on both GaP and CaF2. In terms of the orientation and the spacing between ripples, observed ripples have common features with previously reported ripples.
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