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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Beam shaping for laser-based adaptive optics in astronomy.

Clémentine Béchet, Andrés Guesalaga, Benoit Neichel

    Optics Express
    |June 13, 2014
    PubMed
    Summary

    This study introduces a novel two-deformable mirror system for automated laser beam shaping in astronomical adaptive optics (AO). The system effectively corrects laser distortions, improving AO system performance and reducing noise.

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    Area of Science:

    • Astronomy
    • Optical Engineering
    • Laser Physics

    Background:

    • Laser-based adaptive optics (AO) systems require high-quality laser beams for optimal performance.
    • Free-space laser systems often need frequent, time-consuming alignment procedures.
    • Distortions in laser beams have been observed in operational systems like Gemini South's multi-conjugate adaptive optics system (GeMS).

    Purpose of the Study:

    • To investigate a beam shaping concept using two deformable mirrors for automated laser quality optimization in astronomical AO.
    • To demonstrate the correction of quasi-static aberrations in both amplitude and phase of laser beams.
    • To test a prototype of this two-deformable mirror system on GeMS.

    Main Methods:

    • Development and numerical simulation of a two-deformable mirror beam shaping system.
    • Implementation of a phase retrieval algorithm with a novel unwrapping method for amplitude and phase correction control.
    • Assessment of the system's performance using aberrations measured at GeMS.

    Main Results:

    • The proposed system predicts effective correction of laser amplitude and phase distortions.
    • Approximately 120 actuators per mirror and a 1.4 m mirror separation are found to be effective.
    • The laser spot size is estimated to reduce by up to 15%, equivalent to a 40% increase in photon flux for AO noise reduction.

    Conclusions:

    • The two-deformable mirror concept offers a promising solution for automated laser beam quality optimization in astronomical AO.
    • This approach can significantly enhance the performance and efficiency of laser-based AO systems.
    • The preparatory study provides a strong foundation for the experimental phase of the GeMS prototype testing.