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Automatic speckle cancellation techniques for multidither adaptive optics.

S A Kokorowski, T R O'Meara, R C Lind

    Applied Optics
    |March 11, 2010
    PubMed
    Summary
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    Adaptive optics systems can overcome performance degradation caused by speckle interference. This study demonstrates a method to electronically cancel speckle noise, restoring system performance for improved optical measurements.

    Area of Science:

    • Optical Engineering
    • Signal Processing

    Background:

    • Multidither adaptive optics systems are susceptible to performance degradation.
    • Speckle interference, caused by moving speckle patterns, disrupts system performance by amplitude-modulating intensity distributions and adding noise.

    Purpose of the Study:

    • To investigate the possibility of restoring speckle-degraded performance in multidither adaptive optics systems.
    • To develop and describe a method for mitigating speckle interference.

    Main Methods:

    • Analytical and computer simulations were employed to study speckle effects.
    • A novel method for estimating and electronically canceling speckle interference was developed.

    Main Results:

    • Analytical and simulation results confirm the feasibility of restoring degraded performance.

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  • The proposed method effectively addresses speckle-induced amplitude modulation and additive noise.

    • Conclusions:

    • It is possible to restore the performance of adaptive optics systems affected by speckle.
    • Electronic cancellation of estimated speckle interference is a viable technique for adaptive optics enhancement.