7 June 2005 Periodic ripples produced by a scanning beam of a femtosecond Ti:sapphire laser
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Proceedings Volume 5850, Advanced Laser Technologies 2004; (2005) https://doi.org/10.1117/12.633678
Event: Advanced Laser Technologies 2004, 2004, Rome and Frascati, Italy
Abstract
The formation of periodic ripples is reported under exposure in air of several solids (Ge, GaAs, W, steel, etc.) to a scanning beam of a femtosecond Ti:sapphire laser operating at wavelength λ = 810 nm. Atomic Force Microscope (AFM) and Scanning Electron Microscope (SEM) characterization shows that the period of ripples at normal incidence of laser radiation lies in a sub-λ domain and depends on the nature of the solid. Ripples are oriented perpendicular to the plane of polarization of the laser beam. Their period is different under ablation of a solid in a liquid environment at otherwise equal conditions. The results are interpreted as an interference of the incident laser radiation with a surface electromagnetic wave induced in the solid. The examples are presented of sub-μm structures generated by intersection of several ripple arrays.
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E. Freysz, E. Freysz, S. M. Pershin, S. M. Pershin, G. A. Shafeev, G. A. Shafeev, } "Periodic ripples produced by a scanning beam of a femtosecond Ti:sapphire laser", Proc. SPIE 5850, Advanced Laser Technologies 2004, (7 June 2005); doi: 10.1117/12.633678; https://doi.org/10.1117/12.633678
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