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Beaconless stochastic parallel gradient descent laser beam control: numerical experiments.

Piotr Piatrou1, Michael Roggemann

  • 1Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, Michigan 49931-1295, USA. ppiatrou@mtu.edu

Applied Optics
|September 21, 2007
PubMed
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Adaptive optics beam control effectively compensates for atmospheric turbulence in air-to-ground laser applications. A target-in-the-loop strategy extracts necessary data from degraded laser images for precise beam steering.

Area of Science:

  • Optical Engineering
  • Atmospheric Optics
  • Directed Energy Systems

Background:

  • Atmospheric turbulence significantly degrades laser beam quality, posing challenges for air-to-ground applications.
  • Traditional adaptive optics systems often rely on cooperative beacons, which are not always feasible.
  • Effective beam control is crucial for directed energy applications requiring high power delivery.

Purpose of the Study:

  • To investigate a target-in-the-loop adaptive optics strategy for laser beam control.
  • To assess the feasibility of using degraded target intensity images for beam control without a beacon.
  • To evaluate the performance of a low-order adaptive optics system in strong atmospheric turbulence.

Main Methods:

  • Numerical simulations were employed to model the adaptive optics system and atmospheric effects.

Related Experiment Videos

  • A closed-loop, single-deformable-mirror adaptive optics system was utilized.
  • A stochastic parallel gradient descent optimization algorithm, driven by target-in-the-loop data, minimized a mean-radius performance metric.

    • Main Results:

    • The target-in-the-loop strategy successfully extracted sufficient information from turbulence-degraded laser intensity images.
    • A 25-channel zonal adaptive optics system achieved significant turbulence compensation for energy concentration.
    • Effective tilt correction, in addition to the adaptive optics system, was shown to be critical for high performance.

    Conclusions:

    • A target-in-the-loop approach provides a viable method for adaptive optics beam control in air-to-ground laser systems.
    • This strategy enables effective beam control even in the absence of a cooperative beacon.
    • Low-order adaptive optics systems can achieve substantial turbulence compensation when coupled with appropriate control algorithms and tilt correction.