Title :
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
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;
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
DOI :
10.1109/LEOS.1993.379039
