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Proceedings Paper

Orbital angular momentum experiments with broadband few cycle pulses
Author(s): Asmus Richter; Martin Bock; Juergen Jahns; Ruediger Grunwald
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Paper Abstract

Light distributions of Bessel-Gauss and Laguerre-Gauss type carry an orbital angular momentum and thus can be regarded as particular types of optical vortex beams. Optical vortices in highly intense femtosecond laser pulses are expected to lead to a variety of specific applications like momentum selective spectroscopy, nonlinear laser-material interaction or quantum information processing. Here we report on experiments with a Ti:sapphire laser oscillator at wavelengths around 800 nm. To compare the pulsed and cw case, the system was driven with and without mode-locking. At the minimum pulse duration of about 10 fs, a FWHM spectral bandwidth of 120 nm was available. By applying diffractive spiral phase elements, beams with topological charges of m = 1 and m = 2 were formed. The specific propagation behavior was studied by detecting spatially resolved intensity and spectral maps. In addition to the helical beam generation with fixed phase patterns, adaptive approaches based on liquid-crystal microdisplays are considered.

Paper Details

Date Published: 8 February 2010
PDF: 9 pages
Proc. SPIE 7613, Complex Light and Optical Forces IV, 761308 (8 February 2010); doi: 10.1117/12.840907
Show Author Affiliations
Asmus Richter, Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy (Germany)
FernUniv. of Hagen (Germany)
Martin Bock, Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy (Germany)
Juergen Jahns, FernUniv. of Hagen (Germany)
Ruediger Grunwald, Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy (Germany)

Published in SPIE Proceedings Vol. 7613:
Complex Light and Optical Forces IV
Enrique J. Galvez; David L. Andrews; Jesper Glückstad, Editor(s)

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