Fabrication of nano-grating inside transparent materials by using a single femtosecond laser beam

Shimotsuma, Y., Qiu, J., Kazansky, P.G. and Hirao, K. (2004) Fabrication of nano-grating inside transparent materials by using a single femtosecond laser beam. In Fifth International Symposium on Laser Precision Microfabrication. SPIE.. (doi:10.1117/12.596318).

Abstract

Femtosecond laser is under intense study as a new laser processing tool which can induce refractive index change and color center, etc. inside of transparent materials. Here, we report on the first observation of the formation of polarization-dependent nano-grating by irradiation of only single femtosecond laser beam inside silica glasses. This nano-grating was formed by the self-organization at intervals of 200 nm of generated oxygen defect in the laser focal point. The direction of nano-grating was controllable by laser polarization direction. Additionally, the periodicity was variable according to the irradiation laser light of energy and pulse number. We proposed a mechanism of this novel phenomenon containing the interference between the laser light (photon) and the generated plasma wave on the focal point.

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