Interaction of Laser Light with Biological Tissue

  • A. J. Welch
  • M. Motamedi
Part of the Ettore Majorana International Science Series book series (EMISS, volume 22)

Abstract

Various groups have reported photochemical, thermal and mechanical reactions as the result of irradiating tissue with a laser. Photochemical reactions have included non-thermal retinal damage produced by exposure at blue wavelengths[1,2] and photoradiation therapy, in which hematoporphyrin derivative (HPD) is activated by visible light for the treatment of malignant tumors. Lasers provide the relatively high intensity narrow band light needed for the photochemical reaction to take place[3]. Primarily, lasers are widely used to generate heat through absorption of light by the different constituents of tissue. This process can produce photocoagulation or vaporization of tissue[4]. More recently, lasers have been used to induce optical breakdown and the creation of shock waves which disrupt the surrounding tissue. Plasma breakdown occurs when electric fields are strong enough to strip electrons from atoms, causing ionization of the medium and formation of a plasma. This phenomena is being used in ophthalmology to cut membranes in the eye[5].

Keywords

Nickel Catheter Quartz Attenuation Retina 

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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • A. J. Welch
    • 1
  • M. Motamedi
    • 1
  1. 1.Electrical Engineering and Biomedical Engineering ProgramThe University of TexasAustinUSA

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