Measurement of the surface temperature of the cornea during ArF excimer laser ablation by thermal radiometry with a 15-nanosecond time response

Miya Ishihara, Tsunenori Arai, Shunichi Sato, Yuji Morimoto, Minoru Obara, Makoto Kikuchi

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Background and Objective: The purpose of this work was to develop a temperature measurement system with a nanosecond time response to monitor the transient temperature of the corneal surface during laser refractive surgery. Materials and Methods: Thermal radiation from the surface of the porcine cornea during ArF excimer laser irradiation was measured using a photovoltaic HgCdTe detector with a response bandwidth of 150 MHz. Results: Maximum thermal radiation occurred at 31 ± 4 nanoseconds, which was longer than the time response of the measurement system. The temperature derived from the detected signal reached over 100°C at a fluence of 80 mJ/cm2, which was the ablation threshold, and reached 240°C at a fluence of 180 mJ/cm2. Conclusion: The present system of temperature measurement with a time response of 15.7 nanoseconds revealed that the transient surface temperature of the cornea during ablation is much higher than that previously reported.

Original languageEnglish
Pages (from-to)54-59
Number of pages6
JournalLasers in Surgery and Medicine
Volume30
Issue number1
DOIs
Publication statusPublished - 2002 Feb 6

Keywords

  • HgCdTe detector
  • LASIK
  • Monitor
  • PRK

ASJC Scopus subject areas

  • Surgery
  • Dermatology

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