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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 71, Iss. 7 — Jul. 1, 1981
  • pp: 914–916

Laser eye safety: the implications of ordinary speckle statistics and of speckled-speckle statistics

David L. Fried  »View Author Affiliations


JOSA, Vol. 71, Issue 7, pp. 914-916 (1981)
http://dx.doi.org/10.1364/JOSA.71.000914


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Abstract

The implications of speckle statistics on laser eye-safety considerations are evaluated. The concept of speckled speckle is introduced, and its statistics are shown to correspond to the K0 function. Speckled speckle is defined in terms of the retinal power density when the eye is viewing an optically rough surface that is illuminated by a laser beam diffused through a ground-glass screen—a situation corresponding to subjective speckle modulated by objective speckle. Extensive numerical results are developed relating the ratio of the average power density on the retina over the eye-damage level to the acceptable probability that speckle statistics will cause the damage level to be exceeded. For ordinary speckle and for speckled speckle, for a probability of 10−6 (10−9) of exceeding the damage level, the average power densities must be 0.072 (0.048) and 0.017 (0.0079) of the damage level, respectively.

© 1981 Optical Society of America

Citation
David L. Fried, "Laser eye safety: the implications of ordinary speckle statistics and of speckled-speckle statistics," J. Opt. Soc. Am. 71, 914-916 (1981)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-71-7-914


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References

  1. The phrase "adequately monochromatic" implies that the laser wavelength spread Δλ has an associated frequency spread Δƒ = cΔλ/λ2 (where c is the speed of light) whose wavelength Λ = c/Δƒ = λ2/Δλ is significantly greater than the rms surface roughness of the scattering object.
  2. The term "polarization diversity" carries the implication that the random phase shift associated with the scattering from the rough surface object is different for two orthogonal polarizations.
  3. J. W. Goodman, "Statistical properties of laser speckle patterns," in Topics in Applied Physics, Vol. 9, Laser Speckle and Related Phemomena, J. C. Dainty, ed. (Springer-Verlag, Berlin, 1975).
  4. E. Jakeman and P. N. Pusey, "A model for non-Rayleigh sea echo," IEEE Trans. Antennas Propag. AP24, 806–814 (1976).
  5. We use the term "momentary" here to indicate that the groundglass screen might move (or something else might change), so that the local objective power density on the object is well defined only for an instant.
  6. M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions (U.S. Government Printing Office, Washington, D.C., 1964), p. 376, Eq. (9.6.23).
  7. M. Abramowitz and L. A. Stegun, eds., Handbook of Mathematical Functions (U.S. Government Printing Office, Washington, D.C., 1964), p. 379, Eq. (9.8.6).

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