Diffraction characteristics of a Fresnel zone plate illuminated by 10 fs laser pulses.
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.
Zhang
HaiFeng
H
Department of Electrical Engineering and Center for Electro-Optics, University of Nebraska, Lincoln, NE 68588, USA. zhfg70@yahoo.com
Li
JianChao
J
Doerr
David W
DW
Alexander
Dennis R
DR