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Proceedings Paper

Dynamic behavior of the ablation products of biological soft tissue measured with FELIX
Author(s): Jutta M. Auerhammer; Benedikt J. Jean M.D.; Rudolf Walker; Alexander F. G. van der Meer
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Paper Abstract

The knowledge of the kinetics and the density of the ejected particles can lead to a better understanding of the photoablation process. Therefore, the dynamic behavior of thermal laser ablation (initial velocity of ejected particles v0, recoil momentum p), the ablation threshold and the particle size were studied in vitro on porcine cornea with the free-electron laser FELIX over the wavelength range 6 <EQ (lambda) <EQ 75 micrometers . The ablation cloud was made visible with a stroboscopic technique using different time delays between the (0.1 ns)- illumination pulse and FELIX. The velocity v0 was deduced from the extension of the ablation cloud for a fluence of 2.5 J/cm2 ranging from 100 - 400 n/s. Measurements of p using a pendulum lead to values between 0.7 and 5.5 mm g/s. Both values could be related to the spectroscopically determined absorption coefficient of cornea. If absorption is high (around (lambda) equals 6 and 14 - 16 micrometers ), both v0 and p are enhanced. For the first time it has been observed that the ablation cloud differs from shot to shot, depending not only on (alpha) cornea but also on the kind of absorber.

Paper Details

Date Published: 26 May 1997
PDF: 9 pages
Proc. SPIE 2971, Ophthalmic Technologies VII, (26 May 1997); doi: 10.1117/12.275105
Show Author Affiliations
Jutta M. Auerhammer, Univ. Tuebingen (Germany) and FOM-Institute for Plasma physics (Netherlands)
Benedikt J. Jean M.D., Univ. Tuebingen (Germany)
Rudolf Walker, Univ. Tuebingen (Germany) and FOM-Institute for Plasma physics (Netherlands)
Alexander F. G. van der Meer, FOM-Institute for Plasma Physics (Netherlands)

Published in SPIE Proceedings Vol. 2971:
Ophthalmic Technologies VII
Pascal O. Rol; Karen Margaret Joos M.D.; Fabrice Manns, Editor(s)

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