Abstract
The application of diode-pumped double-clad Nd:glass fiber lasers with high fundamental mode power for laser Doppler anemometry (LDA) will be presented. An acousto-optic modulator (AOM) is used as a diffractive beam splitter, so that the LDA calibration constant is wavelength independent, i.e., achromatic. Hence, broadband emitting powerful fiber lasers can also be employed. The directional discrimination of the LDA velocity measurement was achieved using the heterodyne technique with the frequency shift of the AOM element.
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