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Periodic breakup of optical beams due to self‐focusing
1.R. Y. Chiao, E. Garmire, and C. H. Townes, Phys. Rev. Lett. 13, 479 (1964);
1.E. Garmire, R. Y. Chiao, and C. H. Townes, Phys. Rev. Lett. 16, 347 (1966).
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4.The details of self‐focusing of different diffraction patterns will be reported later. That diffraction is a consideration in self‐focusing has been demonstrated by P. Lallemand and N. Bloembergen, Phys. Rev. Lett. 15, 1010 (1965),
4.and J. A. Fleck and C. Layne, Appl. Phys. Lett. 22, 467 (1973).
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9.It is interesting that the cell shape factor plays an analogous role in self‐focusing of beams of elliptical cross section. See, for example, J. Marburger, NBS Spec. Publ. No. 372 Symposium on Laser Induced Damage in Optical Materials‐Proceedings (U.S. GPO, Washington, D.C., 1972), p. 84.
10.Another interesting question is why a pattern develops with a particular orientation. Ideally this should be random from shot to shot. However, a slight asymmetry in the beam intensity, dust, etc., often causes the pattern to develop a stable orientation. Experimentally we have observed both cases.
11.S. Abbi and H. Mahr, Phys. Rev. Lett. 26, 604 (1971).
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