Abstract

Investigation of physical processes induced under powerful laser radiation interacting with surface of metal are very important to understand the mechanisms of the energy transport during the melting processes. The essential deviations from equilibrium state of the system are a vital point for discussed highly nonlinear phenomena. These deviations could not be described within the frameworks of common (weakly nonlinear) linearized dynamic models. First of all it is concern to such a most general and fundamental nonlinear problem as an excitation of stochastic and turbulent movement in dissipative systems and as a result the definite spatial and temporal structures (often with contrast to fluctuations) arise in considered nonlinear material. But experimental study of discussed phenomena during the melting process under powerful laser radiation as well as under development of electron-beam, electric arc and plasma technologies is limited due to absence of reliable methods for observation of zone of interaction where excited flows come out from the bulk to surface of illuminated material. In the first place it is connected with the formation of blazing plasma directly above the zone of interaction. The experimental unit reported by us for analysis of dynamic processes during the laser treatment of materials consists of two pieces, i.e. the laser technological plant and the laser monitor.

© 1996 IEEE