40 dB fibre optical preamplifier in 1064 nm laser Doppler anemometer

40 dB fibre optical preamplifier in 1064 nm laser Doppler anemometer

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With a neodymium-doped fibre amplifier a small signal gain of 40 dB at 1064 nm has been achieved. Using the same amplifier as an optical preamplifier in a conventional 1064 nm laser Doppler anemometer (LDA), an improvement in the SNR of the LDA radiation and sensitivity enhancement in comparison to that for direct detection with a highly sensitive avalanche photodiode was obtained.


    1. 1)
      • L.E. Drain . (1986) The laser Doppler technique.
    2. 2)
      • Többen, H., Müller, H., Dopheide, D.: `Power and sensitivity improvement of LDA-systems by fibre amplifiers', Selected Paper of 8th Int. Symp. Application of Laser TechniquestoFluid Mechanics, 8–11 July 1996, Springer-Verlag, 1998, Lisbon, Portugal, p. 3–10.
    3. 3)
      • V. Arndt , H. Müller , D. Dopheide . Comparison measurements for selection of suitable photo detectors foruse in Nd:YAG LDA systems. Experiments in Fluids , 460 - 465

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