Pulsed mid-infrared laser ablation of tissue: Photomechanical and photoacoustic effects

Author

Shi, Weiqiang ; Snyder, Wendy J. ; Grundfest, Warren S. ; Cozine, Colette

Author_Institution

Laser Res. Centre, Cedars-Sinai Med. Center, Los Angeles, CA, USA

fYear

1993

fDate

15-18 Nov 1993

Firstpage

232

Lastpage

233

Abstract

We have conducted experiments to investigate the impulse momentum coupling and cavitation induced photomechanical and photoacoustic effects in tissue during mid-infrared laser tissue interaction. We used free-running CTH:YAG and Er:YAG lasers that delivered laser pulses of 250-300 μsec duration. The measured pressures in human lenses of various grades for Er:YAG pulse laser emulsification are presented. Flash photographic studies reveal that cavitation bubble dynamics is dependent on laser wavelength, pulse energy and duration, and the physical properties of the fluid in which cavitation takes place

Keywords

biological effects of laser radiation; cavitation; laser ablation; photoacoustic effect; CTH:YAG lasers; Er:YAG laser; cavitation bubble dynamics; emulsification; flash photography; human lenses; impulse momentum coupling; photoacoustic effects; photomechanical effects; pulsed mid-infrared laser ablation; tissue; Anthropometry; Humans; Laser ablation; Laser theory; Lenses; Optical coupling; Optical pulses; Photoacoustic effects; Pulse measurements; Wavelength measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics Society Annual Meeting, 1993. LEOS '93 Conference Proceedings. IEEE

Conference_Location

San Jose, CA

Print_ISBN

0-7803-1263-5

Type

conf

DOI

10.1109/LEOS.1993.379039

Filename

379039