✦ LIBER ✦

Far-ultraviolet laser ablation of the cornea: Photoacoustic studies

✍ Scribed by Dr. R. Srinivasan; Dr. Peter E. Dyer; Bodil Braren

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 477 KB
Volume: 6
Category: Article
ISSN: 0196-8092
DOI: 10.1002/lsm.1900060606

No coin nor oath required. For personal study only.

✦ Synopsis

Wide bandwidth piezoelectric transducers made of thin (9 pm) polyvinylidene fluoride filni have been used to make time-resolved measurements of the stresswave generated by far-ultraviolet (193 nm) laser ablation in corneal tissue in v i m .

At high fluence ( -250 ml/cm2), ablation commences within 10 ns (-t 5 ns) of the laser pulse and generates short acoustic impulses ( -30 ns). The time profile of the ablation. when coupled to the energy requirements for ablation from earlier work, allows the estimation of a temperature and a half-life for the thermal decomposition of the collagen in cornea. These values do not support a photothermal mechanism for the ablation under the experimental conditions.

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