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Proceedings Paper

65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea
Author(s): Miya Ishihara; Shunichi Sato; Tsunenori Arai; Minoru Obara; Makoto Kikuchi
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Paper Abstract

We measured thermal emission from cornea surface during and just after ArF excimer laser pulse with 65 MHz bandwidth, corresponding to 15 ns rise-time. The rise-time of the thermal emission measurement should be the same order of the heating pulse duration (ArF excimer laser pulse duration of 25 ns) to obtain the rapid temperature change of cornea surface. To acquire the available rise-time, we employed at 150 MHz cut off frequency photovoltaic HgCdTe detector with 100 MHz preamplifiers. We measured the peak temperature of 175 degrees Celsius at the fluence of 160 mJ/cm2. The irradiated cornea temperature decreased rapidly with 280 ns in time constant. We measured the highest temperature elevation during the ArF excimer laser ablation of the cornea comparing with previous reports using our high speed temperature measurement system.

Paper Details

Date Published: 13 June 2000
PDF: 5 pages
Proc. SPIE 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical, (13 June 2000); doi: 10.1117/12.388031
Show Author Affiliations
Miya Ishihara, National Defense Medical College (Japan)
Shunichi Sato, National Defense Medical College Research Institute (Japan)
Tsunenori Arai, National Defense Medical College (Japan)
Minoru Obara, Keio Univ. (Japan)
Makoto Kikuchi, National Defense Medical College (Japan)

Published in SPIE Proceedings Vol. 3914:
Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical
Jeffrey O. Hollinger D.D.S.; Donald Dean Duncan; Jeffrey O. Hollinger D.D.S.; Donald Dean Duncan; Steven L. Jacques, Editor(s)

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