Gas investigation for laser drilling
Article dans une revue avec comité de lecture
JournalJournal of Laser Applications
This article deals with the gas effect on percussion laser drilling in ms pulse duration range. On the one hand, the flow of assistance gas jet is investigated with and without a target using a strioscopy setup and Pitot’s tube. By this way, the position of shock waves in the supersonic jet and near the target surface is revealed. From this characterization, the distance between exit nozzle and target can be optimized to induce higher pressure on surface and protect optics from liquid ejection. On the other hand, metal liquid and vapor jets from irradiated target are observed with a high-speed camera (100 000 Img/sec). Without assistance gas, a surprising result on the video is a shock wave inside the metal vapor jet like a supersonic flow. The assistance gas limits the propagation of the vapor and facilitates the deposition of metallic liquid around the front surface holes.
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Measurement of laser absorptivity for operating parameters characteristic of laser drilling regime Article dans une revue avec comité de lectureSCHNEIDER, Matthieu; BERTHE, Laurent; FABBRO, Rémy; MULLER, Maryse (IOP Publishing, 2008)Laser drilling in the percussion regime is commonly used in the aircraft industry to drill sub-millimetre holes in metallic targets. Characteristic laser intensities in the range of 10 MW cm−2 are typically employed for ...
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