Journal
APPLIED OPTICS
Volume 44, Issue 33, Pages 7187-7190Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.44.007187
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The far-field intensity distribution of hollow Gaussian beams was investigated based on scalar diffraction theory. An analytical expression of the M-2 factor of the beams was derived on the basis of the second-order moments. Moreover, numerical examples to illustrate our analytical results are given. (c) 2005 Optical Society of America.
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