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I've heard that Bessel beams don't diffract. If Bessel beams continuously bombarded a laser sail, would it keep the ship constantly accelerating from our frame of reference?

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No, the apparent acceleration would continually diminish as the object being propelled approached the speed of light.

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  • $\begingroup$ You can only have a non-difracting Bessel beam for a distance equal to the radius of the emmiting source. After that point the beam begins to spread. $\endgroup$
    – mike stone
    Sep 12, 2021 at 13:24

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