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: Contribution to journalConference article

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
Pages (from-to)122-126
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3914
Publication statusPublished - 2000 Dec 3
EventLaser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical - San Jose, CA, USA
Duration: 2000 Jan 222000 Jan 27

    Fingerprint

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this