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Proceedings Paper

Truncated ultrashort-pulse small-angle Bessel beams
Author(s): Ruediger Grunwald; Uwe J. Neumann; Gero Stibenz; Stefan Langer; Günter Steinmeyer; Volker Kebbel; Jean-Luc Néron; Michel Piché
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Paper Abstract

Ultrashort-pulse single-maximum nondiffracting beams of microscopic radius and large axial depths are interesting for applications in nonlinear optics and spectroscopy, for acceleration and manipulation of particles, measuring techniques, materials treatment or information processing. Here we report on the experimental generation of such beams by self-apodized truncation of Bessel and pseudo-Bessel beams from a Ti:sapphire oscillator. Small angle operation was enabled by thin-film structures. To obtain self-apodization, the diameter of the truncating diaphragm was adapted to the first minima of Bessel distribution. The propagation of (a) Bessel beams of meter-range axial extension shaped by axicon mirrors, and (b) microscopic pseudo-Bessel beams of millimeter-range extension shaped by Gaussian-shaped microaxicon lenses was studied. In case (a), single-maximum beams of > 20 cm depth were produced. To generate comparable focal zones from Gaussian beams, a much larger distance (10x) is necessary, and axial stretching of spectrum destructs the temporal structure. In case (b), the focal zone length was increased by a factor of >5 compared to a Gaussian beam. Arrays of truncated Bessel beams were generated as well. The experimental results indicate that truncated Bessel beams enable more compact setups than corresponding Gaussian beams and are in particular advantageous for ultrashort pulses. Further improvements are possible by combining coherent addition in resonators with truncation outcoupling.

Paper Details

Date Published: 16 November 2004
PDF: 12 pages
Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); doi: 10.1117/12.567390
Show Author Affiliations
Ruediger Grunwald, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Uwe J. Neumann, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Gero Stibenz, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Stefan Langer, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Günter Steinmeyer, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Volker Kebbel, Bremer Institut für Angewandte Strahltechnik (Germany)
Jean-Luc Néron, COPL, Univ. Laval (Canada)
Michel Piché, COPL, Univ. Laval (Canada)


Published in SPIE Proceedings Vol. 5579:
Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers
Donna Strickland; Trevor J. Hall; Stoyan Tanev; Xiaoyi Bao; Franko Kueppers; David V. Plant, Editor(s)

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