Femtosecond Laser Surface Texturing of Materials for Various Applications

Description

Download Femtosecond Laser Surface Texturing of Materials for Various Applications. Theoretical Physics students who are writing their projects can get this material to aid their research work.

Abstract

Femtosecond lasers represent an electromagnetic field with field intensities  approaching and even exceeding atomic binding field.

When irradiated on a target, the material responses change from linear to nonlinear within a very short time. In most situations nonlinear absorption dominates and can be used in micromachining of materials.

In this work, analytical formulae are outlined relating laser and target parameters. This permits prediction of ablation conditions of materials.

Ions are pulled out of a target due to charge separation caused by escaping electrons in the ablation layer which have acquired sufficient laser energy. In most cases the escaping electrons have energies equal or greater than the sum of the work function and the binding energy of the lattice.

Introduction

Modification of surface properties over multiple length scale plays an important role in optimizing a material’s performance for a given application. A materials susceptibility to wear and surface damage can be reduced by altering its surface chemistry, morphology, and crystal structure.

Also, one can consider the optical properties as well as the frictional, adhesive, and wetting forces acting at a materials interface as being strongly influenced by the size and shape of the micro and nano-scale features present.

It has been established that the interaction of laser light with a material can lead to permanent changes in the material’s properties not easily achievable through other means.

Laser irradiation induces changes to the local chemistry, the local crystal structure, and the local morphology, all of which affect how the material behaves in a given application.

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