Light-absorption-induced heating causes altered surface reflectance of an oblique laser probe beam to achieve high signal-to-noise in a laser absorption spectrometer prism device

Marcos T. T. Pacheco; Wilfredo Irrazabal Urruchi

doi:10.1117/12.137486

7 August 1992 Light-absorption-induced heating causes altered surface reflectance of an oblique laser probe beam to achieve high signal-to-noise in a laser absorption spectrometer prism device

Marcos T. T. Pacheco, Wilfredo Irrazabal Urruchi

Author Affiliations +

Proceedings Volume 1646, Laser-Tissue Interaction III; (1992) https://doi.org/10.1117/12.137486
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

We describe an improved measurement of tissue absorption of light by using a mirage effect due to the thermal gradient at the tissue surface. The laser beam enters a prism where internal reflection is highly dependent on the incident angle. The system is calibrated using an acoustic-optical cell. Finally, we discuss design of a compact system which can produce an electrical signal related directly with the sample optical radiation absorption.

Citation Download Citation

Marcos T. T. Pacheco and Wilfredo Irrazabal Urruchi "Light-absorption-induced heating causes altered surface reflectance of an oblique laser probe beam to achieve high signal-to-noise in a laser absorption spectrometer prism device", Proc. SPIE 1646, Laser-Tissue Interaction III, (7 August 1992); https://doi.org/10.1117/12.137486

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