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Proceedings Paper

Threshold energies in the artificial retina
Author(s): Dale J. Payne; Richard A. Hopkins; Brent Eilert; Gary D. Noojin; Benjamin A. Rockwell
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Paper Abstract

Laser threshold energies for artificial retinal damage from ultrashort (i.e. less than or equal to 1 ns) laser pulses are investigated as a function of both pulse width and spot size. A piece of film acts as the absorbing layer and is positioned at the focus of the Cain artificial eye (17 mm in water). We performed experiments at the focal point, and at two and ten Rayleigh ranges in front of the focus with the damage endpoint being the presence of a bubble coming off the film. Thresholds were determined for wavelengths of 1064 nm, 580 nm, and 532 nm with pulse durations ranging from the nanosecond (ns) to the femtosecond (fs) regimes. For the at-focus data in the visible regime, the threshold dropped from 0.25 (mu) J for a 5 ns pulse at 532 nm to 0.11 (mu) J for a 100 fs, 580 nm pulse. Similarly, for the near infrared (NIR) the threshold changed from 5.5 (mu) J for a 5 ns pulse to 0.9 (mu) J for a 130 fs pulse. These results are discussed in the context of applicable nonlinear optical phenomena.

Paper Details

Date Published: 13 May 1998
PDF: 5 pages
Proc. SPIE 3254, Laser-Tissue Interaction IX, (13 May 1998); doi: 10.1117/12.308157
Show Author Affiliations
Dale J. Payne, Air Force Research Lab. (United States)
Richard A. Hopkins, Air Force Research Lab. (United States)
Brent Eilert, Air Force Research Lab. (United States)
Gary D. Noojin, The Analytical Sciences Corp. (United States)
Benjamin A. Rockwell, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 3254:
Laser-Tissue Interaction IX
Steven L. Jacques; Jeff Lotz, Editor(s)

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