Diffraction of Bessel-Gaussian beam passing through annular and circular apertures
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Department of Physics, Anhui Normal University, Wuhu 241008, China;
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2.
Anhui Institute of Optics & Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
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Received Date:
2007-02-15
Accepted Date:
2007-06-06
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Abstract
From the Collins formula,the diffraction of Bessel-Gaussian beam passing through circular and annular apertures was studied based on numerical simulation.The results indicate that the axial intensity of Bessel-Gaussian beam through a circular aperture changes with the Fresnel number F periodically;the axial intensity of Bessel-Gaussian beam through an annular aperture attenuates with the F at the function of vibration.When F is the same,the transversal intensity of Bessel-Gaussian beam through a circular aperture distributes more smooth than an annular aperture.The smaller the annular aperture,more obvious is the modulation of transversal intensity;when the annular aperture is equal to the waist of the beam,the transversal intensity is independent of the Fresnel number F.
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