High-density bump formation on a glass surface using femtosecond laser processing in water
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- Hayasaki, Y. & Kawamura, D. Appl. Phys. A (2007) 87: 691. doi:10.1007/s00339-007-3930-z
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Micrometer-sized bumps were formed on a glass surface using a focused femtosecond laser processing in water. The bumps were formed over a wide ranges of pulse irradiation parameters, including irradiation energy and focus position. The bumps exhibited a wide variety of morphologies and sizes depending on the parameters. The use of a liquid, namely heavy water, which returns after breakdown and cavitation bubble formation, enabled us to fabricate bumps with high spatial density, which is not possible using a solid coating that is ablated. A desired arrangement of bumps on a glass surface was fabricated by tuning the processing time interval to be more than the disappearance time of a bubble, generated by focusing a femtosecond laser pulse near the water/glass interface.