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Proceedings Paper

Direct assessment of thermal lensing in ocular media using an artificial eye
Author(s): Erica L. Weber; Mike Rickman; Andrew K. Dunn; Ashley J Welch; Robert J. Thomas
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Paper Abstract

A new fiber-based imaging system has been incorporated into a modifie artificia eye for direct measurement of the thermal lensing effect induced by an infrared laser (1319 nm) to correlate changes in the visible wavefront to visual distortions observed by human subjects. The response of a visible beam, 632 nm, was observed with respect to various exposures of the infrared light under different power levels and exposure durations. Infrared irradiance levels between 0.57 and 4.56 W • cm-2 were used with exposure durations of 0.25, 0.50, 0.75, 1, and 2 seconds in order to observe the optimal level of radiant energy needed to bloom a visible beam at the retinal plane. Results show that deformation of the visible beam focused on the retina begins at irradiance levels of 2.28 W • cm-2 with significan blurring (10 times larger than the original size) at 3.80 W • cm-2. A maximum visible beam size at the retina is achieved with exposure durations of 0.75 seconds, and no observable change was reported for longer exposure durations. These results strongly correlate to the previously determined threshold for visual distortion in human subjects using infrared lasers of 2.98 W • cm-2. Based on these results, the visible wavefront will need to expand four times its original size in order to overcome any accommodation effects and induce an observable visual disruption in human subjects.

Paper Details

Date Published: 9 February 2012
PDF: 6 pages
Proc. SPIE 8221, Optical Interactions with Tissue and Cells XXIII, 822106 (9 February 2012); doi: 10.1117/12.910716
Show Author Affiliations
Erica L. Weber, Air Force Research Lab. (United States)
The Univ. of Texas at Austin (United States)
Consortium Research Fellowship Program (United States)
Mike Rickman, TASC, Inc. (United States)
Andrew K. Dunn, The Univ. of Texas at Austin (United States)
Ashley J Welch, The Univ. of Texas at Austin (United States)
Robert J. Thomas, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 8221:
Optical Interactions with Tissue and Cells XXIII
E. Duco Jansen; Robert J. Thomas, Editor(s)

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