Abstract
We present the formation of periodic ripples in ZnO crystal irradiated by a wavelength-tunable femtosecond laser. The results indicate that in the surface thin layer, the periods change from to λ with laser fluences and pulse numbers, and in the subsurface layer the periods are always , where n is the refractive index. The formation processes and mechanisms are also discussed.
© 2010 Optical Society of America
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