Focusing of Apertured Gaussian Beams at Long Ranges
Technical rept. 1 Jan-15 Sep 1970
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
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Using Fresnel diffraction integrals, calculations have been made of the irradiance and power distributions in the vicinity of the focus for Gaussian beams focused through annular apertures. The effect of shifting the peak of the Gaussian aperture distribution from the aperture center was investigated and was found to be a small effect in some special cases. Gaussian and sinusoidal phase distortions of the aperture field were included in the calculations. It was found that these kinds of phase distortions generally reduce the focal plane irradiances in sometimes unpredictable ways. The numerical examples chosen for illustration should be useful in interpreting future experiments to be conducted by the Air Force Weapons Laboratory at the Sandia Optical Range.
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