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

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

doi:10.1117/12.388031

13 June 2000 65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea

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

Proceedings Volume 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical; (2000) https://doi.org/10.1117/12.388031
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

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.

Citation Download Citation

Miya Ishihara, Shunichi Sato, Tsunenori Arai, Minoru Obara, and Makoto Kikuchi "65MHz bandwidth measurement of thermal emission induced by ArF excimer laser ablation of cornea", Proc. SPIE 3914, Laser-Tissue Interaction XI: Photochemical, Photothermal, and Photomechanical, (13 June 2000); https://doi.org/10.1117/12.388031

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available