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Proceedings Paper

Directional achromatic laser Doppler anemometer employing powerful diode-pumped fiber lasers
Author(s): Juergen W. Czarske; Holger Zellmer; K. Plamann; Herbert Welling
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Paper Abstract

Diode pumped fiber lasers are compact reliable light sources and achieve today over 30 W fundamental mode power. Hence, they are attractive for the realization of portable laser Doppler anemometer (LDA) systems with high optical power. We present the application of fiber lasers together with diffraction optics for the realization of a miniaturized achromatic directional LDA system. Different methods for the realization of the directional discrimination of the scattering particle movement were investigated and compared. (1) The use of Bragg cells as frequency shifter and diffractive beam splitter for the realization of a heterodyne technique. (2) The application of a two- wavelength fiber laser and Fourier optical phase shifters for the realization of a homodyne technique. (3) The detection of the position of the scattering particle in the measuring volume by dual-fiber receiving techniques.

Paper Details

Date Published: 19 July 1999
PDF: 2 pages
Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); doi: 10.1117/12.354960
Show Author Affiliations
Juergen W. Czarske, Laser Zentrum Hannover e.V. (Germany)
Holger Zellmer, Friedrich-Schiller-Univ. Jena (Germany)
K. Plamann, Laser Zentrum Hannover e.V. (Germany)
Herbert Welling, Laser Zentrum Hannover e.V. (Germany)


Published in SPIE Proceedings Vol. 3749:
18th Congress of the International Commission for Optics
Alexander J. Glass; Joseph W. Goodman; Milton Chang; Arthur H. Guenther; Toshimitsu Asakura, Editor(s)

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