40 dB fibre optical preamplifier in 1064 nm laser Doppler anemometer

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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.

Inspec keywords: neodymium; optical fibre amplifiers; laser beams; laser noise; preamplifiers; laser Doppler anemometry; anemometers; sensitivity

Other keywords: 1064 nm; highly sensitive avalanche photodiode; fibre optical preamplifier; laser Doppler anemometer; signal-to-noise ratio; small signal gain; optical preamplifier; 40 dB; radiation; Nd-doped fibre amplifier; sensitivity enhancement; direct detection

Subjects: Velocity, acceleration and rotation measurement; Velocity, acceleration and rotation measurement; Fibre lasers and amplifiers; Fibre lasers and amplifiers; Metrological applications of lasers; Laser beam interactions and properties; Design of specific laser systems; Measurement instrumentation and techniques for fluid dynamics; Level, flow and volume measurement; Laser beam characteristics and interactions; Metrological applications of lasers

References

    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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