65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea

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

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

We measured thermal emission from cornea surface during and just after ArF excimer laser pulse with 65MHz bandwidth, corresponding to 15ns 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 25ns) to obtain the rapid temperature change of cornea surface. To acquire the available rise-time, we employed a 150MHz cut off frequency photovoltaic HgCdTe detector with 100MHz preamplifiers. We measured the peak temperature of 175°C at the fluence of 160mJ/cm 2. The irradiated cornea temperature decreased rapidly with 280ns 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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pages122-126
Number of pages5
Volume3914
Publication statusPublished - 2000
Externally publishedYes
EventLaser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical - San Jose, CA, USA
Duration: 2000 Jan 222000 Jan 27

Other

OtherLaser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical
CitySan Jose, CA, USA
Period00/1/2200/1/27

Fingerprint

cornea
Excimer lasers
Laser ablation
thermal emission
excimer lasers
laser ablation
bandwidth
Bandwidth
Laser pulses
pulse duration
Temperature
preamplifiers
Cutoff frequency
Temperature measurement
time constant
temperature
temperature measurement
fluence
cut-off
high speed

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Ishihara, M., Sato, S., Arai, T., Obara, M., & Kikuchi, M. (2000). 65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3914, pp. 122-126)

65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea. / Ishihara, Miya; Sato, Shunichi; Arai, Tsunenori; Obara, Minoru; Kikuchi, Makoto.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3914 2000. p. 122-126.

Research output: Chapter in Book/Report/Conference proceedingChapter

Ishihara, M, Sato, S, Arai, T, Obara, M & Kikuchi, M 2000, 65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 3914, pp. 122-126, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical, San Jose, CA, USA, 00/1/22.
Ishihara M, Sato S, Arai T, Obara M, Kikuchi M. 65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3914. 2000. p. 122-126
Ishihara, Miya ; Sato, Shunichi ; Arai, Tsunenori ; Obara, Minoru ; Kikuchi, Makoto. / 65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3914 2000. pp. 122-126
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