大出力炭酸ガスレーザの熱源的研究(第 6 報) : Wall-Focusing 効果について

概要

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A method obtaining transient distributions of two energy densities in the hole drilled by high energy density beams such as laser and electron beams was proposed : ω_ν which passed through the plane perpendicular to the beam axis and ω_s which was absorbed by the side wall of the hole. In the hole of acrylic resin drilled by CW CO_2 laser beam, maximum value of ω_ν reached 2∿3 times that of the focal point of the lens system used due to a "wall-focusing effect". In the hole drilled by the electron beam, the wall-focusing effect was not recognized except for near surface, and beam was rather scattered by the vapor. As the result, the CO_2 laser beam produced slender cylindrical hole and the electron beam produced fat hole. The method proposed here may be applied to measure the beam power.
社団法人溶接学会の論文
1974-03-25