Spherical aberration effects in lens–axicon doublets: theoretical study

Abstract

Effects of spherical aberrations in converging and diverging lens-axicon doublets are investigated. Intensity profiles are obtained in the line and ring focal regions by numerically solving the Fresnel-Kirchhoff integral. Comparisons with aberration-free computations show that higher peak irradiances occur for the converging doublet when spherical aberrations are included. Results are presented for axicons with small apex angles in lens-axicon combinations illuminated by collimated Gaussian 1.064-mum laser beams.

Laser-Induced Breakdown Spectroscopy for Mars surface analysis: capabilities at stand-off distances and detection of chlorine and sulfur elements

“…By investigating the craters with the optical microscope, a multiple-ring structure was observed for 3 and 5 m distances (that can be attributed to the lenses doublet spherical aberrations [31]) and an increase of the crater diameter between 3 and 5 m ( Table 2). The spatial intensity distribution of our multi-mode laser varies with the change of laser focusing distance.…”

Bessel-like beams with z-dependent cone angles

“…In what follows the optical beams formed in such schemes will be referred to as z-dependent Bessel-like beams. To realize such beams, use can be made of a modification of linear axicons and various lens systems with spherical aberration and anastigmatic lens axicons with the reflecting spherical surfaces [12][13][14][15][16]. Such schemes have been investigated before, mainly with the aim of obtaining the maximally uniform an-axis profile and constant diameter of the central spot size at the given focal segment as well as with the aim of minimization of astigmatism that is typically large for conical optics [17].…”

Absorption and emission characteristics of femtosecond laser plasma filaments in the air

“…3 in greater detail. It is known that the lens aberrations essentially affect the laser intensity distribution in the focal region [32][33][34][35][36]. Laser radiation intensity I at each point of the focal region is defined by the following relation:…”