16 November 2000 Observation of visible photons during infrared irradiation of bovine liver in the nonablative regime
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Proceedings Volume 4161, Optical Biopsy and Tissue Optics; (2000); doi: 10.1117/12.409318
Event: EOS/SPIE European Biomedical Optics Week, 2000, Amsterdam, Netherlands
Abstract
The biological-tissue response to laser irradiation has been a subject of intense research recently, because of the potential applications to non-invasive disease diagnosis. In this work, bovine liver was irradiated with 1060 nm laser light, both in the ablative and non-ablative regime. The light emitted by the tissue was detected in the visible spectra. The ablative regime was characterized by the strong signal generated due to photo-induced disruption of the biological tissue, resulting in strongly luminescent plasma. Under the non-ablative regime, it was possible to detect visible light, which may be attributed to non-linear, multi-photon absorption, upconversion or other cooperative optical effect in the tissue molecules. The optical processes involved are discussed.
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S. S. Ferreira Pinto, Egberto Munin, Renato Amaro Zangaro, Marcos T. T. Pacheco, "Observation of visible photons during infrared irradiation of bovine liver in the nonablative regime", Proc. SPIE 4161, Optical Biopsy and Tissue Optics, (16 November 2000); doi: 10.1117/12.409318; https://doi.org/10.1117/12.409318
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KEYWORDS
Tissue optics

Visible radiation

Liver

Photons

Luminescence

Infrared radiation

Plasma

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