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Parametric control of a diffractive axicon beam rider.

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    Laser beam riders, crucial for light sails, demonstrate a restoring force when displaced from the optical axis. Modulated laser light enables parametric gain and damping, advancing optical propulsion research.

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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Aerospace Engineering

    Background:

    • Laser beam riders are optical structures designed for attraction to the optical axis and propulsion via radiation pressure.
    • These structures are fundamental to the development of laser-driven light sails for space propulsion.
    • Understanding the dynamics of these structures is key to optimizing laser-based propulsion systems.

    Purpose of the Study:

    • To experimentally investigate the restoring force of a diffractive axicon film when displaced from the optical axis.
    • To analyze the effects of continuous and modulated illumination on the motion of the axicon film.
    • To explore the potential for parametric gain and damping in laser-driven optical systems.

    Main Methods:

    • A thin diffractive axicon film with a 12.7µm period was fabricated from photopolymer.
    • The axicon grating was suspended in a vacuum torsion oscillator for precise motion measurement.
    • Irradiation was performed using a 1.5 W near-infrared laser, with modulation at a 38s period.

    Main Results:

    • The diffractive axicon film exhibited a natural restoring force when its axis was displaced from the optical axis.
    • Continuous laser illumination resulted in harmonic motion of the axicon.
    • Modulated laser illumination demonstrated both parametric gain and parametric damping effects.

    Conclusions:

    • Optical momentum change of diffracted light is responsible for the observed restoring force.
    • Modulated illumination offers a method to control and enhance the dynamics of laser beam riders.
    • These findings have implications for the design and control of laser-driven light sails and optical propulsion systems.