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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 13 — May. 1, 2001
  • pp: 2216–2223

Scattering and thermal lensing of 2.12-µm laser radiation in biological tissue

Michael Ith, Martin Frenz, and Heinz P. Weber  »View Author Affiliations


Applied Optics, Vol. 40, Issue 13, pp. 2216-2223 (2001)
http://dx.doi.org/10.1364/AO.40.002216


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Abstract

We studied light propagation of holmium:YAG laser radiation (λ = 2.12 µm) by measuring the two-dimensional laser beam profile before and after propagation through a tissue sample with a modified fast-temperature-measurement technique. The comparison between water and cartilage tissue allowed us to differentiate between beam broadening caused by formation of a thermal lens and broadening due to light scattering. In water, beam propagation is influenced by formation of thermal lensing, whereas in cartilage the broadening was caused by a combination of light scattering and thermal lensing. Additionally, we discovered that the observed effects are subject to dynamic changes during the laser–tissue interaction.

© 2001 Optical Society of America

OCIS Codes
(000.1430) General : Biology and medicine
(040.1880) Detectors : Detection
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(350.6830) Other areas of optics : Thermal lensing

History
Original Manuscript: September 8, 2000
Revised Manuscript: January 16, 2001
Published: May 1, 2001

Citation
Michael Ith, Martin Frenz, and Heinz P. Weber, "Scattering and thermal lensing of 2.12-µm laser radiation in biological tissue," Appl. Opt. 40, 2216-2223 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-13-2216


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