Spatially and temporally resolved study of laser induced absorption waves produced by a 5 us/1J TE-CO2 laser

Peter G. Bickel; H. Arenz; Jens Christiansen; E. Eberl; Michael Kauf

doi:10.1117/12.184756

7 September 1994 Spatially and temporally resolved study of laser-induced absorption waves produced by a 5 μs/1J TE-CO₂ laser

Peter G. Bickel, H. Arenz, Jens Christiansen, E. Eberl, Michael Kauf

Author Affiliations +

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.

Citation Download Citation

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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