Far-ultraviolet laser ablation of the cornea: photoacoustic studies

Wide bandwidth piezoelectric transducers made of thin (9 microns) polyvinylidene fluoride film have been used to make time-resolved measurements of the stress-wave generated by far-ultraviolet (193 nm) laser ablation in corneal tissue in vitro. At high fluence (approximately 250 mJ/cm2), ablation co...

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Bibliographic Details
Published inLasers in surgery and medicine Vol. 6; no. 6; p. 514
Main Authors Srinivasan, R, Dyer, P E, Braren, B
Format Journal Article
LanguageEnglish
Published United States 1987
Subjects
Animals
Cornea - surgery
Laser Therapy
Rabbits
Time Factors
Ultraviolet Rays
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Summary:Wide bandwidth piezoelectric transducers made of thin (9 microns) polyvinylidene fluoride film have been used to make time-resolved measurements of the stress-wave generated by far-ultraviolet (193 nm) laser ablation in corneal tissue in vitro. At high fluence (approximately 250 mJ/cm2), ablation commences within 10 ns (+/- 5 ns) of the laser pulse and generates short acoustic impulses (approximately 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.
ISSN:0196-8092
DOI:10.1002/lsm.1900060606