Abstract:
:A novel laser system has been developed to study the effects of multiple laser pulses of differing wavelengths on cutaneous blood vessels in vivo, using the hamster dorsal skin flap preparation and in vitro, using cuvettes of whole or diluted blood. The system permits sequenced irradiation with well-defined intrapulse spacing at 532 nm, using a long-pulse frequency-doubled Nd:YAG laser, and at 1064 nm, using a long-pulse Nd:YAG laser. Using this system, we have identified a parameter space where two pulses of different wavelengths act in a synergistic manner to effect permanent vessel damage at radiant exposures where the two pulses individually have little or no effect. Using a two-color pump-probe technique in vitro, we have identified a phenomenon we call greenlight-induced infrared absorption, where a pulse of green light causes photochemical and photothermal modifications to the chemical constituents of blood and results in enhanced infrared absorption. We identify a new chemical species, met-hemoglobin, not normally present in healthy human blood but formed during laser photocoagulation which we believe is implicated in the enhanced near-infrared absorption.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Barton JK,Frangineas G,Pummer H,Black JFdoi
10.1562/0031-8655(2001)073<0642:cpitpt>2.0.co;2subject
Has Abstractpub_date
2001-06-01 00:00:00pages
642-50issue
6eissn
0031-8655issn
1751-1097journal_volume
73pub_type
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