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. Dynamic parameters such as the extension of the ablation cloud, the initial velocity and momentum of the ablated particles as well as the ablation threshold, the ablated mass, and the particle size were investigated. The ablation plume was made visible with a stroboscopic technique. For a fluence of 3.1 J/cm2 the average initial velocity of the ejected particles was deduced from the extension of the plume to range from 120–400 m/s. Measurements of the recoil momentum using a sensitive pendulum led to values between 0.5 and 2.0 mm g/s. All measured properties were related to the spectroscopically determined absorption coefficient of cornea αcornea. Where absorption due to proteins is high (at λ=6.2 and 6.5 μm), ablated mass, velocity and recoil momentum behave according to αcornea. For the first time, variations of the ablation plume from pulse to pulse were observed. Those, as well as the particle size, not only depend on the absorption coefficient, but also on the predominant absorber.
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Received: 4 November 1997/Revised version: 7 September 1998
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Auerhammer, J., Walker, R., van der Meer, A. et al. Dynamic behavior of photoablation products of corneal tissue in the mid-IR: a study with FELIX . Appl Phys B 68, 111–119 (1999). https://doi.org/10.1007/s003400050595
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DOI: https://doi.org/10.1007/s003400050595