Nonlinear interaction of linearly polarized laser radiation with condensed media and overcoming the diffraction limit

Abstract

We have analyzed known experimental results on the formation of periodic structures in con densed media under the action of a series of femtosecond linearly polarized laser pulses. The found examples of the formation of spatial periods of structures with a scale smaller than the diffraction optical limit in the condensed medium have been interpreted in terms of a nonlinear mathematical model, a one dimensional unimodal logistic mapping that describes how a change in the period that is multiple of two depends on the changing control parameter.

Control the Metal Grain Boundary Recrystallization Evolution by the Laser Radiation Electric Field Strength Direction Under Cyclic Thermal Loading

“…The third type of structures was observed only for laser pulse duration τ ≈ 10 ns at q values not exceeding the material melting threshold. The produced microrelief was the quasi-grating G, the period of which varied by laser radiation power density and orientation was G ⊥ E. Note that in contrast to the resonant micro-and nanostructures (of first and second types), the quasi-gratings had no precise value of the period according to formula (1) or (2). So, the third type of structures could not be explained in the framework of the universal polariton model.…”

“…The arising phenomena of linear polarized electric field strength-oriented grating formation are well described in framework of universal polariton model (UPM) of laser-induced condensed matter damage [1]. The UPM well describes the spatial periods for normally oriented (g || E) [2] and abnormally oriented (g ⊥ E) gratings (g) as for long pulse durations [3] as for ultrashort laser pulses [4,5]. Here E is the electric field strength vector of incident laser radiation.…”

Interaction of femtosecond laser radiation with carbon materials: exfoliation of graphene structures and synthesis of low-dimensional carbon structures

“…The interaction of femtosecond laser radiation with materials is often accompanied by the formation of micro-and nanostructures on the irradiated surface [3]. The formation of nanorods or nanotips arrays in the case of structuring on the surface of carbon targets is a distinct sub-interest.…”