This paper presents simulation and experimental results for the exposure of some carbon-based materials to alexandrite and Nd3+:YAG (yttrium aluminum garnet) laser radiation. Simulation of the heating effects was carried out using the COMSOL Multiphysics 3.5 package for samples of carbon-based P7295-2 fiber irradiated using an alexandrite laser and carbon-based P4396-2 fiber irradiated using an Nd3+:YAG laser, as well as by applying finite element modeling for P7295-2 samples irradiated using an Nd3+:YAG laser. In the experimental part, P7295-2 samples were exposed to alexandrite laser radiation while samples of carbon-based composite 3D C/C were exposed to Nd3+:YAG laser radiation. Micrographs of the laser induced craters were obtained by light and scanning electron microscopy, and the images analyzed using the ImageJ software. The results obtained enable identification of the laser–material interaction spots, and characterization of the laser induced changes in the materials investigated.

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Article Highlights• Interaction of glassy carbon with Nd 3+ :YAG laser beam of various energy densities were investigated • Damage morphology analysis has shown that damage morphology depends on the energy density • The Image analysis have applied for obtaining quantitative description of the damage topology • Numerical simulation of glassy carbon interaction with laser was performed by COMSOL Multiphysics • Numerical simulation was based on thermal model and FEM method Abstract Laser beam interaction with carbon based material (glassy carbon) is analyzed in this paper. A Nd 3+ :YAG laser beam (1.06 μm, i.e., near infrared range (NIR)) in ms regime with various energy densities is used. In all experiments, provided in applied working regimes, surface damages have occurred. The results of laser damages are analyzed by light and scanning electron microscopy (SEM). Image J software is used for quantitative analysis of generated damages based on micrographs obtained by light and SEM microscopes. Temperature distribution in the exposed samples is evaluated by numerical simulations based on COMSOL Multiphysics 3.5 software in a limited energy range.Keywords: laser, interaction, glassy carbon based material, quantitative analysis, numerical simulation.Carbon based modern materials in practice can be found in a number of types [1]. Various arrangements of microstructure domains, ordered and disordered, are produced in commercial or laboratory samples, leading to design of carbon materials of different characteristics. The new technological processes make possibility for designing and producing materials with desired mechanical, thermal, electrical, and other properties [2,3]. Laser interaction with well-known graphite -and diamond-like materials remains an unresolved issue. Recently, carbon active materials, carbon nanotubes, 60 C and carbon composites, have been attracting attention. Fabrics and generally fiberCorrespondence: P. Jovanić,

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Due to its excellent mechanical, chemical and optical properties, also on fatigue, polymethilmetacrylate (PMMA) is widely used for many purposes. PMMA has a reputation as a material that cannot be machined well, but, its elasticity and toughness enable its shaping by the deformation processes. Laser drilling and cutting are also available techniques for PMMA sheets shaping, used when both mechanical and optical PMMA properties must be preserved. In this work, the influence of CO 2 laser cutting/drilling on transparent and coloured PMMA surfaces is investigated, as well as by the other laser systems. The cut surfaces were investigated by a light microscopy and, on those surfaces, the average surface roughness R a was measured. The material zone affectted by the laser beam during the cutting process was monitored by a thermal imaging, and theoretical simulations of temperature distribution in this area were performed using the various versions of COM-SOL packages.