Open AccessQuasi-Bessel beams from asymmetric and astigmatic illumination sources
Author(s) -
Angelina Müller,
Matthias C. Wapler,
Ulrich Schwarz,
Markus Reisacher,
Katarzyna Holc,
O. Ambacher,
Ulrike Wallrabe
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.017433
Subject(s) - axicon , optics , bessel beam , physics , bessel function , radius , beam (structure) , astigmatism , laser , laser beams , computer security , computer science
We study the spatial intensity distribution and the self-reconstruction of quasi-Bessel beams produced from refractive axicon lenses with edge emitting laser diodes as asymmetric and astigmatic illumination sources. Comparing these to a symmetric mono-mode fiber source, we find that the asymmetry results in a transition of a quasi-Bessel beam into a bow-tie shaped pattern and eventually to a line shaped profile at a larger distance along the optical axis. Furthermore, we analytically estimate and discuss the effects of astigmatism, substrate modes and non-perfect axicons. We find a good agreement between experiment, simulation and analytic considerations. Results include the derivation of a maximal axicon angle related to astigmatism of the illuminating beam, impact of laser diode beam profile imperfections like substrate modes and a longitudinal oscillation of the core intensity and radius caused by a rounded axicon tip.