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7 September 1994 Spatially and temporally resolved study of laser-induced absorption waves produced by a 5 μs/1J TE-CO2 laser
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Proceedings Volume 2207, Laser Materials Processing: Industrial and Microelectronics Applications; (1994) https://doi.org/10.1117/12.184756
Event: Europto High Power Lasers and Laser Applications V, 1994, Vienna, Austria
Abstract
The phenomenon of laser supported absorption (LSA) of CO2 laser radiation is investigated with spatially and temporally resolved plasma spectroscopy in Argon as ambient gas at pressures of 1 - 105 Pa. A TE-CO2 laser with a gas mixture of CO2/N2/He equals 1/4/4 at a total pressure of half an atmosphere is used. The pulselength of the TE- CO2 laser is about 6 microsecond(s) at a mean power of some 100 kW. LSA-phenomena and material ablation processes are compared with that of a conventional TEA-CO2 short pulse laser. It could be shown that longer pulses of less mean power make material ablation more efficient if the absorption wave becomes transparent within the pulse time of the laser. Maximum electron density of 2.5 (DOT) 1017 and a temperature of 3 eV were measured 1.5 microsecond(s) after the beginning of the irradiation for an expanding aluminum plasma into vacuum.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Peter G. Bickel, H. Arenz, Jens Christiansen, E. Eberl, and Michael Kauf "Spatially and temporally resolved study of laser-induced absorption waves produced by a 5 μs/1J TE-CO2 laser", Proc. SPIE 2207, Laser Materials Processing: Industrial and Microelectronics Applications, (7 September 1994); https://doi.org/10.1117/12.184756
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