Simulations of surface formation by femtosecond laser under breakdown threshold. Abstract. N.Fedorov « Modélisation et procédés laser ultra brefs » Carry le Rouet : 18 – 19 Mars 2010 Studying of Laser Induced Periodic Parallel structure (LIPPS) gave knowledge about speed of surface’s erosion under femtosecond laser irradiation. Creation and self organization of periodic structure on the surface is the result of interference of laser beam on the surface and modulation of erosion rate by surface’s shape. So, a small crater with a sharp profile will be mostly sublimated. This aspect allows us to drill a deep channel with diameter much smaller then beam’s diameter. An experimental study will follow.