Er:YAG laser ablation of tissue: Effect of pulse duration and tissue type on thermal damage

Joseph T. Walsh*, Thomas J. Flotte, Thomas F. Deutsch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

423 Scopus citations

Abstract

The thermal damage caused by 2.94‐μm Er:YAG laser ablation of skin, cornea, aorta, and bone was quantified. The zone of residual thermal damage produced by normal‐spiking‐mode pulses (pulse duration ≈ 200 μs) and Q‐switched pulses (pulse duration ≈ 90 ns) was compared. Normal‐spiking‐mode pulses typically leave 10–50 μm of collagen damage at the smooth wall of the incisions; however, at the highest fluences (≈ 80 J/cm2) tears were produced in cornea and aorta and as much as 100 μm of damaged collagen is found at the incision edge. Q‐switched pulses caused less thermal damage, typically 5–10 μm of damage in all tissues.

Original languageEnglish (US)
Pages (from-to)314-326
Number of pages13
JournalLasers in Surgery and Medicine
Volume9
Issue number4
DOIs
StatePublished - 1989

Keywords

  • aorta
  • bone
  • cornea
  • modeling
  • skin
  • tissue damage
  • tissue denaturation

ASJC Scopus subject areas

  • Surgery
  • Dermatology

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