Oscillatory Instabilities Produced by Laser or Hot-Wire Heating Below an Interface

抄録

A review concerning oscillatory instabilities produced by laser (thermal lens oscillations, optical heartbeats) or hot- wire heating below an interface is given. The dynamical states and bifurcations observed in thermal lensing are described. For the hot-wire experiments, critical quantities for the onset of overstability (Hopf bifurcation) are given and discussed. Three theoretical approaches are developed in order to understand these instability phenomena and recover experimental results : numerical analysis, examination of possible analogies with simpler systems and design of very simple models. The systems under discussion indicate a new candidate for systematic studies in the framework of nonlinear dissipative dynamical systems.