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19 July 1999 Directional achromatic laser Doppler anemometer employing powerful diode-pumped fiber lasers
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Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.354960
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States
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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Juergen W. Czarske, Holger Zellmer, K. Plamann, and Herbert Welling "Directional achromatic laser Doppler anemometer employing powerful diode-pumped fiber lasers", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.354960
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