Structures on human fingernail surface processed by use of a focused femtosecond laser pulse

Hayato Takagi; Akihiro Takita; Hirotsugu Yamamoto; Yoshio Hayasaki; Nobuo Nishida; Hiroaki Misawa

doi:10.1117/12.596598

8 October 2004 Structures on human fingernail surface processed by use of a focused femtosecond laser pulse

Hayato Takagi, Akihiro Takita, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida, Hiroaki Misawa

Proceedings Volume 5662, Fifth International Symposium on Laser Precision Microfabrication; (2004) https://doi.org/10.1117/12.596598
Event: Fifth International Symposium on Laser Precision Microfabrication, 2004, Nara, Japan

Abstract

Processing of a human fingernail surface by a tightly focused femtosecond laser pulse is investigated. The processed structure in the fingernail surface is strongly dependent on focus position and irradiation energy of a laser pulse. A variety of structures depending on the focus position were observed. A sudden change in the size of the processed structure according to the irradiation pulse energy is also observed. From a linear theoretical estimation based on the diffraction of a laser beam, we found that the sudden change is mainly due to the diffraction pattern generated by the circular aperture of an objective lens. The processing feature is investigated by comparing the structures processed in a fingernail with those processed in glass.

Citation Download Citation

Hayato Takagi, Akihiro Takita, Hirotsugu Yamamoto, Yoshio Hayasaki, Nobuo Nishida, and Hiroaki Misawa "Structures on human fingernail surface processed by use of a focused femtosecond laser pulse", Proc. SPIE 5662, Fifth International Symposium on Laser Precision Microfabrication, (8 October 2004); https://doi.org/10.1117/12.596598

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