title: Effects of primary spherical aberration, coma, astigmatism and field curvature on             the focusing of ultrashort pulses: homogenous illumination.
abstract: We analyze the spatiotemporal intensity of pulses with durations of 20 fs and             shorter and a carrier wavelength of 810 nm at the paraxial focal plane of an achromatic             doublet lens. The incident pulse is well-collimated, and we use the Seidel aberration             theory for thin lenses to evaluate the phase change due to the aberrations of the lens.             In a set of cemented thin lenses with the stop at the lens, there is only spherical             aberration, coma, astigmatism and field curvature, whereas the distortion aberration in             the phase front is zero. We analyze the effect of these aberrations in the focusing of             ultrashort pulses for homogenous illumination. We will show that the temporal spreading             introduced by these aberrations in pulses shorter than 20 fs at 810 nm is very small but             the spatial spreading is not, which reduces the intensity of the pulse             considerably.
authors: Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Ciudad Universitaria, México City, Mexico.
authors: M A
authors: MA
authors: González-Galicia
authors: M
authors: M
authors: Rosete-Aguilar
authors: J
authors: J
authors: Garduño-Mejía
authors: N C
authors: NC
authors: Bruce
authors: R
authors: R
authors: Ortega-Martínez