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Proceedings Paper

Plasma-mediated ablation using picosecond UV and IR laser pulses and spectroscopical investigations of the plasma spark
Author(s): Marcus H. Goetz; F. Baptista; Joerg P. Fischer; C. Messer; N. Suhm; Josef F. Bille
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Paper Abstract

In-vitro ablation experiments of calf brain tissue with ultrashort lasers are reported. Excisions have been performed by the mechanism of plasma-mediated ablation with focused picosecond laser pulses. Results achieved with a 35 ps oscillator/regenerative amplifier Nd:YLF laser at 1053 nm and its second and fourth harmonic at 526 and 263 nm, respectively, are presented. Preliminary experiments with 19 ps laser pulses at wavelengths near 3 micrometers generated by optical parametric amplification are reported. Here, during the ablation with low photon energies no plasma was induced. Furthermore, the spectrum of laser-induced plasma sparks on the surface of fresh calf brain tissue was recorded. Atomic line widths were measured and used to determine the electron density of the plasma. With energy densities of about 100 J/cm2 values between 2 (DOT) 1017 and 5 (DOT) 1018 cm-3 were found.

Paper Details

Date Published: 18 January 1995
PDF: 9 pages
Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); doi: 10.1117/12.199200
Show Author Affiliations
Marcus H. Goetz, Univ. of Heidelberg (Germany)
F. Baptista, Univ. of Heidelberg (Germany)
Joerg P. Fischer, Univ. of Heidelberg (Germany)
C. Messer, Univ. of Heidelberg (Germany)
N. Suhm, Univ. of Heidelberg (Germany)
Josef F. Bille, Univ. of Heidelberg (Germany)


Published in SPIE Proceedings Vol. 2323:
Laser Interaction with Hard and Soft Tissue II
Hans Joerg Albrecht; Guy P. Delacretaz; Thomas H. Meier; Rudolf W. Steiner; Lars Othar Svaasand; Martin J. C. van Gemert, Editor(s)

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