Fresnel diffraction patterns by circular and serrated apertures under ultrashort pulsed-laser illumination are investigated in detail. A comparison of the diffraction patterns for pulsed and continuous wave illuminations reveals that an ultrashort pulsed beam of 10 fs can result in a significant effect on the distribution of the intensity. As a result a uniform intensity distribution in the transverse direction of the beam can be achieved as a result of the interference of the different frequency components within the pulsed beam. The interference fringes caused by the wavelets originating from the diffraction aperture can be further reduced when a serrated aperture is used.
© 1996 Optical Society of America
Original Manuscript: May 19, 1995
Revised Manuscript: October 11, 1995
Manuscript Accepted: October 11, 1995
Published: April 1, 1996
Min Gu and X. S. Gan, "Fresnel diffraction by circular and serrated apertures illuminated with an ultrashort pulsed-laser beam," J. Opt. Soc. Am. A 13, 771-778 (1996)