FORMATION OF PERIODIC STRUCTURES AT THE SURFACE OF SILICATE UNDER RESONANT ACTION OF CO2 LASER IRRADIATION
Moscow State Mining University, Department of Physics; Professor
A. M. Bondar
Moscow State Mining University; Professor
I. V. Velesevich
Moscow State Mining University; Senior Scientist
Зильбершмидт М. Г.
Московский государственный горный университет, кафедра физики горных пород; профессор
V. B. Laptev
Institute of Spectroscopy RAS; Senior Scientist
I. M. Shvedov
Moscow State Mining University, Department of Physics of Rocks;
Abstract. Periodical structures formed at the surface of a natural silicate (quartz, fused silica, nepheline, and rodonite) under the action of pulsed CO2 laser radiation (pulse energy of 1 J, pulse duration of 70 ns) is studied. High resolution optical microscope is used for observation of laser spot characteristics and IR reflection spectroscopy is applied to investigate the surface features before and after exposure to CO2 laser irradiation. The period of the structures obtained is found to be of about 7,3 μm for crystal quartz and about 8 μm for fused silica at laser frequency of 975 cm–1.
Keywords: CO2 laser, fused silica, quartz, silicate, periodical structures, IR reflection spectra.