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Diffraction characteristics of a Fresnel zone plate illuminated by 10 fs laser pulses

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Abstract

Results of experimental and theoretical work performed to compare diffraction patterns and focal distributions of a Fresnel zone plate illuminated by ultrashort 10  fs pulsed and cw laser beams are presented. It is shown that the foci intensities of 10  fs pulses are considerably lower than those of cw beams while the focal widths in the axial and radial directions are broadened. Calculations also indicate the spectral modulation along the center of the diffraction patterns. These phenomena are explained by the coherent superposition of the composing frequency content.

© 2006 Optical Society of America

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Equations (10)

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