25 April 2007 Hot plasma diagnostics during femtosecond laser ablation in a cavity
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Proceedings Volume 6606, Advanced Laser Technologies 2006; 66060S (2007); doi: 10.1117/12.729640
Event: Advanced Laser Technologies 2006, 2006, Brasov, Romania
Abstract
On-line diagnostics of hot plasma induced by superintense femtosecond laser pulses in a cavity during the deep hole drilling of solid target has been developed. Such a plasma is characterized by higher values of hard X-ray yield and hot electron temperature in comparison with the same parameters measured for flat nearsurface plasma. Dynamics of X-rays yield in the cavity during the deep hole drilling demonstrates several repetitive stages. The yield and energy of X-rays from plasma ignited in a cavity depend on the beam waist position respect to the target surface plane, i.e. focusing regime. We have detected strong second harmonic signal that correlated with hard X-Ray yield in the time of cavity formation. Depth resolved elemental analysis of compound targets, based on this diagnostics technique, has been proposed.
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V. M. Gordienko, I. A. Makarov, E. V. Rakov, "Hot plasma diagnostics during femtosecond laser ablation in a cavity", Proc. SPIE 6606, Advanced Laser Technologies 2006, 66060S (25 April 2007); doi: 10.1117/12.729640; https://doi.org/10.1117/12.729640
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KEYWORDS
X-rays

Plasma

Femtosecond phenomena

Laser ablation

Hard x-rays

Solids

Diagnostics

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