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Proceedings Article

Effect of hydrogen bonding on far-ultraviolet water absorption and potential implications for 193-nm ArF excimer laser-tissue interaction

[+] Author Affiliations
Joseph T. Walsh, Jr., Paul T. Staveteig

Northwestern Univ. (USA)

Proc. SPIE 2391, Laser-Tissue Interaction VI, 176 (May 22, 1995); doi:10.1117/12.209880
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From Conference Volume 2391

  • Laser-Tissue Interaction VI
  • Steven L. Jacques
  • San Jose, CA, United States | February 01, 1995

abstract

The mechanisms causing transient 193-nm optical absorption of collagen during ablative-fluence ArF excimer pulses are poorly understood. The preponderance of hypotheses proposed to explain this phenomenon, such as ultrafast secondary-structure denaturation of proteins and transient free radical formation, focus on the protein matrix and ignore potential contributions from other tissue components such as water. A substantial body of spectroscopic literature places 193 nm adjacent to a steep absorption edge of water that rises to 60,000 cm-1 at 163 nm; other evidence shows that this absorption edge shifts toward 193 nm upon hydrogen-bond breakage. In this paper we show that heating of water from 20-100°C increases the liquid's absorption coefficient. Further investigations using an infrared pump laser show a significant increase in absorption by water of a 193-nm probe beam. Based on this evidence, we speculate that 193-nm laser ablation of tissue may contain a photothermal component related to dynamic absorption of incident radiation by water.

© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Joseph T. Walsh, Jr. and Paul T. Staveteig
"Effect of hydrogen bonding on far-ultraviolet water absorption and potential implications for 193-nm ArF excimer laser-tissue interaction", Proc. SPIE 2391, Laser-Tissue Interaction VI, 176 (May 22, 1995); doi:10.1117/12.209880; http://dx.doi.org/10.1117/12.209880


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