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Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
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Published on: October 17, 2010

Reference-beam storage for long-range low-coherence pulsed Doppler lidar.

A A Dorrington, R Kunnemeyer, P M Danehy

    Applied Optics
    |March 22, 2008
    PubMed
    Summary

    A novel laser Doppler velocimeter stores reference beams, enabling low-coherence lasers for lidar. This technique simplifies lidar systems, potentially reducing cost and size for commercial use.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Remote Sensing

    Background:

    • Traditional lidar systems require highly coherent lasers, increasing cost and complexity.
    • Maintaining coherence over long path lengths is a significant challenge in lidar applications.

    Purpose of the Study:

    • To develop a laser Doppler velocimeter (LDV) technique that relaxes coherence requirements for lidar.
    • To enable the use of low-coherence lasers in lidar systems, reducing cost and size.
    • To validate a novel reference beam storage and delay method.

    Main Methods:

    • Implementing a reference beam storage and delay mechanism using fiber-optic ring resonators.
    • Generating reference pulse trains from the stored reference beams.
    • Beating delayed Doppler-shifted measurement beams with reference pulses at simulated distances.

    Main Results:

    • Successful validation of the reference beam storage and delay concept.
    • Demonstration of lidar measurements using low-coherence lasers.
    • Obtained results at various simulated distances, confirming the technique's viability.

    Conclusions:

    • The developed LDV technique successfully preserves coherence for long-path-length measurements.
    • The use of low-coherence lasers is feasible with this method, offering potential cost and size reductions for commercial lidar.
    • Fiber-optic ring resonators are effective for reference beam storage and pulse generation in this application.

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