Analysis of the Decomposition of Transparent Polymer Materials (Blocks) under the Action of Laser Beams in Free Generation Mode

摘要

In the literature was investigated mechanism of decomposition of transparent blocks depending on power of generation, on number of pulses/momenta, on focal length of lens and so forth on ruby and neodymium lasers both in regime/conditions of free generation and in regime/conditions of giant pulse/momentum. However, the mechanism of the decomposition of the materials indicated under the action of laser beams by the different authors is explained differently. Unity of opinion to mechanism of decomposition of transparent materials (blocks) under effect of coherent emission at the present time still is absent. Some experimental results, on the effect/action of supersonic plasma jets on different polymeric materials, showed that in the mechanism of decomposition the dominant role is played by thermal effects. Therefore it was of interest to check this assumption in the case of the effect of laser emission on the polymeric materials. For this purpose two laser installations on the glass with neodymium were assembled. Were studied changes in form of fracture of blocks of polymethyl methacrylate - PMMA, quartz, glass, polystyrene in dependence on focal length of lens, power of generation of place of focusing of laser beam in material. The pictures of decomposition were investigated both visually and photographically with the aid of the photographic camera and the microscope.