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Far‐ultraviolet laser ablation of the cornea: Photoacoustic studies
Author(s) -
Srinivasan R.,
Dyer Peter E.,
Braren Bodil
Publication year - 1987
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.1900060606
Subject(s) - ablation , materials science , fluence , laser , ultraviolet , cornea , laser ablation , photoablation , optics , piezoelectricity , optoelectronics , biomedical engineering , composite material , excimer laser , medicine , physics , engineering , aerospace engineering
Wide bandwidth piezoelectric transducers made of thin (9 m̈m) 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 (∼ 250 mJ/cm 2 ), ablation commences within 10 ns (± 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 photo‐thermal mechanism for the ablation under the experimental conditions.