Laser-induced plasma from pure and doped water-ice at high fluence by ultraviolet and infrared radiation

J. Schou; A. Matei; K. Rodrigo; M. Dinescu

doi:10.1117/12.785427

12 May 2008 Laser-induced plasma from pure and doped water-ice at high fluence by ultraviolet and infrared radiation

J. Schou, A. Matei, K. Rodrigo, M. Dinescu

Proceedings Volume 7005, High-Power Laser Ablation VII; 70050X (2008) https://doi.org/10.1117/12.785427
Event: High-Power Laser Ablation 2008, 2008, Taos, New Mexico, United States

Abstract

Ice made of ultrapure water or water doped with 1 % polymer (polyethylene glycol, "PEG") was irradiated by laser light with fluences between 2 and 80 J/cm² in the ultraviolet (UV) regime at 355 nm and in the infrared (IR) regime at 1064 nm in vacuum. In the UV regime there is a threshold for plasma formation at 3.5 J/cm², whereas the threshold is at 8.5 J/cm² in the IR regime. The ions from the plasma plume were studied by a Langmuir probe. The ion yield was much higher for UV laser irradiation than for IR laser irradiation. The peak of the time-of-flight spectra comprises ions of velocity from 60 to 110 km/s. Generally, the ion yield was slightly larger for ice samples doped with PEG than for pure ones. The threshold behavior was much more pronounced in the IR regime than in the UV regime. These results indicate that the behavior of the plasma current can be understood in terms of ionization breakdown at the ice surface.

Citation Download Citation

J. Schou, A. Matei, K. Rodrigo, and M. Dinescu "Laser-induced plasma from pure and doped water-ice at high fluence by ultraviolet and infrared radiation", Proc. SPIE 7005, High-Power Laser Ablation VII, 70050X (12 May 2008); https://doi.org/10.1117/12.785427

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