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Related Concept Videos

Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.

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Bringing the Visible Universe into Focus with Robo-AO
10:35

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Published on: February 12, 2013

Adaptive optics and ground-to-space laser communications.

R K Tyson

    Applied Optics
    |November 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Adaptive optics systems improve laser communication by reducing signal fluctuations. These systems enhance optical signal propagation between space and ground, minimizing signal fade and surge for better performance.

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    Area of Science:

    • Optical Engineering
    • Free-space Optical Communication

    Background:

    • Laser communication systems are susceptible to atmospheric turbulence, causing signal fade and surge.
    • Adaptive optics (AO) systems can potentially mitigate these effects by compensating for atmospheric distortions.

    Purpose of the Study:

    • To investigate the relationship between laser communication system parameters and adaptive optics system parameters.
    • To quantify the benefits of AO in improving optical signal propagation for space-to-ground links.

    Main Methods:

    • Analysis of optical signal fade and surge in relation to atmospheric log-amplitude variance.
    • Development of expressions linking AO system performance to the reduction of log-amplitude variance.
    • System-level examination of AO effects on signal propagation.

    Main Results:

    • Adaptive optics systems can compensate for atmospheric turbulence with a few degrees of freedom.
    • AO integration leads to a significant reduction in optical signal fade and surge.
    • Demonstrated advantageous reduction in signal fade and surge through system-level examples.

    Conclusions:

    • Adaptive optics are crucial for enhancing the reliability of free-space laser communication.
    • AO systems offer a viable solution for mitigating atmospheric impairments in optical links.
    • The study provides a framework for evaluating AO performance in laser communication systems.