Air Force Research Labs, Brooks Air Force Base, TX
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Resources and Links Facility Reports and Information Air Force Research Labs, Brooks Air Force Base, TX
2007 - Wavelength dependence of ocular damage thresholds
in the near-ir to far-ir transition region: proposed revisions to MPES This report summarizes the results of a series
of infrared (IR) laser-induced ocular damage studies conducted
over the past decade. The studies examined retinal, lens, and
corneal effects of laser exposures in the near-IR to far-IR
transition region (wavelengths from 1.3-1.4 mum with exposure
durations ranging from Q-switched to continuous wave). The
corneal and retinal damage thresholds are tabulated for all
pulsewidth regimes, and the wavelength dependence of the IR
thresholds is discussed and contrasted to laser safety standard
maximum permissible exposure limits. The analysis suggests that
the current maximum permissible exposure limits could be
beneficially revised to (1) relax the IR limits over wavelength
ranges where unusually high safety margins may unintentionally
hinder applications of recently developed military and
telecommunications laser systems; (2) replace step-function
discontinuities in the IR limits by continuously varying
analytical functions of wavelength and pulsewidth which more
closely follow the trends of the experimental retinal (for
point-source laser exposures) and corneal ED50 threshold data;
and (3) result in an overall simplification of the permissible
exposure limits over the wavelength range from 1.2-2.6 mum. A
specific proposal for amending the IR maximum permissible
exposure limits over this wavelength range is presented.
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