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Measurement of the surface temperature of the cornea during ArF excimer laser ablation by thermal radiometry with a 15‐nanosecond time response
Author(s) -
Ishihara Miya,
Arai Tsunenori,
Sato Shunichi,
Morimoto Yuji,
Obara Minoru,
Kikuchi Makoto
Publication year - 2002
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.10021
Subject(s) - nanosecond , fluence , ablation , materials science , cornea , optics , excimer laser , excimer , laser , irradiation , radiation , optoelectronics , temperature measurement , medicine , physics , nuclear physics , quantum mechanics
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/cm 2 , which was the ablation threshold, and reached 240°C at a fluence of 180 mJ/cm 2 . 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. Lasers Surg. Med. 30:54–59, 2002. © 2002 Wiley‐Liss, Inc.