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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 72, Iss. 4 — Apr. 1, 1982
  • pp: 519–521

Thermal-blooming time constant

David L. Fried and Gus E. Mevers  »View Author Affiliations


JOSA, Vol. 72, Issue 4, pp. 519-521 (1982)
http://dx.doi.org/10.1364/JOSA.72.000519


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Abstract

Thermal blooming is analyzed by using a wave-propagation code to determine the speed of response of the blooming effect to changes in the transmitted laser beam. Results are developed to indicate where along the propagation path the dominant part of the thermal-blooming effects arise. It is found that most of the effect arises within about two times the depth of focus of the target, where the beam diameter is small. This suggests, and the time-dependent propagation results confirm, that the time constant descriptive of the speed of response of thermal blooming is proportional to the time it takes a parcel of air to move across the beam width in the depth-of-focus region.

© 1982 Optical Society of America

Citation
David L. Fried and Gus E. Mevers, "Thermal-blooming time constant," J. Opt. Soc. Am. 72, 519-521 (1982)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-72-4-519


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References

  1. C. B. Hogge, "Adaptive optics in high energy laser systems," in Adaptive Optics and Short Wavelength Sources, S. F. Jacobs, M. Sargent III, and M. O. Scully, eds. (Addison-Wesley, Reading, Mass., 1978),
  2. J. N. Hayes, P. B. Ulrich, and A. H. Aitken, "Effects of the atmosphere on the propagation of 10.6-µ laser beams," Appl. Opt. 11, 257–260 (1972).
  3. F. G. Gebhardt and D. C. Smith, "Self-induced thermal distortion in the near field for a laser beam in a moving medium," IEEE J. Quantum Electron. QE-7, 63–73 (1971).
  4. D. L. Fried, ed., J. Opt. Soc. Am. 67, 269–422 (1977) (special issue on adaptive optics).

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