A23 光吸収性媒質中における超短パルスレーザの自己集束現象と温度場の解析(OS9 レーザ応用加工(1))

概要

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When an ultrashort pulse laser is focused and irradiated into the inside of permeable medium, the refractive index changes dependently on the electric field strength. As a result, a self-focusing phenomenon occurs and self-focusing can lead to a filamentation. In the light absorption medium, the absorbed light energy changes to the thermal energy after ultrashort pulse laser irradiation. Then melting or partial ablation phenomena occur near the focusing area in the medium. In this study, a paraxial wave equation in the Kerr medium which absorbs the laser beam was derived. By numerical calculation by the split-step Fourier method with the fast Fourier transform, light absorption energy distribution in a fused silica irradiated by an ultrashort pulse laser was obtained. Using the absorbed energy distribution as the initial condition, heat transfer analysis in the material was conducted. The influences of the absorption coefficient on the intensity distribution and the temperature distribution in the material were investigated.
一般社団法人日本機械学会の論文
2010-11-19