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Proceedings Paper

Few-cycle vortex wavepackets with tunable topological charge
Author(s): R. Grunwald; M. Bock; J. Brunne; U. Wallrabe
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Paper Abstract

The control of the orbital angular momentum (OAM) of ultrashort laser pulses with highly compact, low-dispersion and flexible devices opens new prospects for momentum-sensitive applications in plasmonics, materials processing, biochemistry, microscopy or optical data transfer. We report on the generation of few-cycle vortex pulses of variable topological charge from a Ti:sapphire laser oscillator with novel types of thermally tunable reflective, spiral-phase micro-electro-mechanical systems (MEMS). The spatial and temporal properties of the pulses were characterized by a reconfigurable, nondiffracting Shack-Hartmann wavefront autocorrelator. The intensity propagation can be described by a Laguerre-Gaussian beam with slight distortions caused by the line of maximum phase step. The different topological charges were indicated by quantitatively comparing the lengths of measured transversal Poynting-vector components to corresponding numerical simulations.

Paper Details

Date Published: 25 February 2014
PDF: 6 pages
Proc. SPIE 8999, Complex Light and Optical Forces VIII, 89990W (25 February 2014); doi: 10.1117/12.2060877
Show Author Affiliations
R. Grunwald, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
M. Bock, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
J. Brunne, Albert-Ludwigs-Univ. Freiburg (Germany)
U. Wallrabe, Albert-Ludwigs-Univ. Freiburg (Germany)

Published in SPIE Proceedings Vol. 8999:
Complex Light and Optical Forces VIII
David L. Andrews; Enrique J. Galvez; Jesper Glückstad, Editor(s)

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