Dynamic behavior of the ablation products of biological soft tissue measured with FELIX

Jutta M. Auerhammer; Benedikt J. Jean M.D.; Rudolf Walker; Alexander F. G. van der Meer

doi:10.1117/12.275105

26 May 1997 Dynamic behavior of the ablation products of biological soft tissue measured with FELIX

Jutta M. Auerhammer, Benedikt J. Jean M.D., Rudolf Walker, Alexander F. G. van der Meer

Proceedings Volume 2971, Ophthalmic Technologies VII; (1997) https://doi.org/10.1117/12.275105
Event: BiOS '97, Part of Photonics West, 1997, San Jose, CA, United States

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.

Citation Download Citation

Jutta M. Auerhammer, Benedikt J. Jean M.D., Rudolf Walker, and Alexander F. G. van der Meer "Dynamic behavior of the ablation products of biological soft tissue measured with FELIX", Proc. SPIE 2971, Ophthalmic Technologies VII, (26 May 1997); https://doi.org/10.1117/12.275105

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