Measurement of laser-induced dynamic structures on the surface of materials in a real time scale

Abstract

Abstract The processes induced by laser radiation in the region of its interaction with matter are characterized by a high development rate and exclude direct contact of measuring detectors in the interaction region. The opportunity of structural adjustment of the irradiated surface of the material requires recording the temporal characteristics of these dynamic processes, which essentially determine the structural surface phase transitions in a heterogeneous medium. Therefore, for their diagnostics the highly sensitive, non-contact and inertialess registration methods are required. We used promising in this aspect optical recording methods based on the two channel scheme, i.e. the pump-probe techniques: the power pump laser and additional/probe laser radiation (brightness amplifies) to measure the development of nonlinear dynamic processes on the solid surface under laser radiation. The approach in frame of work of the such unified intelligent laser technological system results in control in time of processes of both laser thermal hardening with corresponding characteristics and generation of the spatial structures of different types on the surface of metallic units. We demonstrated some results for the laser technological processing with powerful laser radiation of a metal surface.