Dosimetry of He-Ne laser radiation on specimens of human tympanic membrane

Hans-Jochen Foth; Christian Huthoff; Axel Gauer; Antonio Baker; Norbert Stasche M.D.; Karl Hoermann M.D.

doi:10.1117/12.167300

1 February 1994 Dosimetry of He-Ne laser radiation on specimens of human tympanic membrane

Hans-Jochen Foth, Christian Huthoff, Axel Gauer, Antonio Baker, Norbert Stasche M.D., Karl Hoermann M.D.

Proceedings Volume 2084, Biomedical Optoelectronic Devices and Systems; (1994) https://doi.org/10.1117/12.167300
Event: Europto Biomedical Optics '93, 1993, Budapest, Hungary

Abstract

The clinical application of a laser-Doppler-vibrometry for recording the motion of the tympanic membrane is relying on the harmlessness of the used He-Ne-laser beam. Even when the daily experience tells that an intensity of 1 mW focused onto the skin introduces no obvious thermal effects, focusing this beam down to a waist of a diameter of 40 micrometers , as it is done in this case, raises up the density of power to 80 W/cm². Safety rules postulate a maximum radiation time at this density of less than 10 ms sec, which is much too short to perform any measurement. Therefore the threshold and the degree of thermal effects have been investigated histomorphologically.

Citation Download Citation

Hans-Jochen Foth, Christian Huthoff, Axel Gauer, Antonio Baker, Norbert Stasche M.D., and Karl Hoermann M.D. "Dosimetry of He-Ne laser radiation on specimens of human tympanic membrane", Proc. SPIE 2084, Biomedical Optoelectronic Devices and Systems, (1 February 1994); https://doi.org/10.1117/12.167300

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