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

Joseph T. Walsh, Paul T. Staveteig

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations

Abstract

The mechanisms causing transient 1 93-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 ofwater that rises to 60,000 cm-1 at 163 nm; other evidence shows that this absorption edge shifts toward 1 93 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 1 93-nm probe beam. Based on this evidence, we speculate that 1 93-nm laser ablation of tissue may contain a photothermal component related to dynamic absorption of incident radiation by water.

Original languageEnglish (US)
Pages (from-to)176-183
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume2391
DOIs
StatePublished - May 22 1995
EventLaser-Tissue Interaction VI 1995 - San Jose, United States
Duration: Feb 1 1995Feb 8 1995

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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