Anomalous transmission of laser radiation in water and biological tissues

Zdzislaw Jankiewicz; Andrzej Zajac

doi:10.1117/12.206832

12 April 1995 Anomalous transmission of laser radiation in water and biological tissues

Zdzislaw Jankiewicz, Andrzej Zajac

Proceedings Volume 2387, Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases II; (1995) https://doi.org/10.1117/12.206832
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

The processes which occur during interaction of radiation of erbium laser ((lambda) equals 2.9 micrometers ) and holmium one ((lambda) equals 2.1 micrometers ) with tissues have been studied recently considering medical applications. The phenomena of generation of intensive shock wave during propagation of Er laser radiation in water are well known. The relations of absorption coefficient (alpha) as a function of wavelength, presented in literature, show the essential differences of its values for these lasers; (alpha) equals 80 cm^-1 for Ho laser and (alpha) equals 13000 cm^-1 for Er laser. The calculations of volumetric density of radiation energy in a tissue have been made. The values of energy density obtained for free generation of both Ho and Er lasers exceed of several orders the energy radiation density of Nd:YAG laser with the narrowed pulse. In such a case the interactions of radiation of both lasers Er and Ho, respectively, will have significant nonlinear effects. The experiments verifying a value of radiation transmission of Er and Ho lasers, in water, have been carried out. A thickness of water layer is a variable parameter. For the same energy density of laser radiation the threshold value, in excess of which occurs the measurable value of energy at the output of experiment set-up, is significantly different in case of both lasers radiation. The value of threshold energy and transmission for energy density above the threshold have been measured. The results of experiment confirmed that Er laser radiation causes the stronger destruction in the deeper layers of the tissues. The experimental verification has been made at the anatomical specimens.

Citation Download Citation

Zdzislaw Jankiewicz and Andrzej Zajac "Anomalous transmission of laser radiation in water and biological tissues", Proc. SPIE 2387, Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases II, (12 April 1995); https://doi.org/10.1117/12.206832

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