Plasma-mediated ablation using picosecond UV and IR laser pulses and spectroscopical investigations of the plasma spark

Marcus H. Goetz; F. Baptista; Joerg P. Fischer; C. Messer; N. Suhm; Josef F. Bille

doi:10.1117/12.199200

18 January 1995 Plasma-mediated ablation using picosecond UV and IR laser pulses and spectroscopical investigations of the plasma spark

Marcus H. Goetz, F. Baptista, Joerg P. Fischer, C. Messer, N. Suhm, Josef F. Bille

Author Affiliations +

Proceedings Volume 2323, Laser Interaction with Hard and Soft Tissue II; (1995) https://doi.org/10.1117/12.199200
Event: International Symposium on Biomedical Optics Europe '94, 1994, Lille, France

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.

Citation Download Citation

Marcus H. Goetz, F. Baptista, Joerg P. Fischer, C. Messer, N. Suhm, and Josef F. Bille "Plasma-mediated ablation using picosecond UV and IR laser pulses and spectroscopical investigations of the plasma spark", Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); https://doi.org/10.1117/12.199200

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