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A comment on Bessel Beam. Parent comment

Re:Bessel Beam by SiempreViernes on Tuesday August 28, 2018 @08:02AM (#17858123)
Well, for truly unbounded length you need to keep the source on for infinite time of course.

But light beams do get very long for very modest work, and properly focused they can propagate very long distances indeed.

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Re:Bessel Beam by SideburnsOfDoom on Tuesday August 28, 2018 @04:20PM (#17862498)
So, to be clear here - is the answer yes or no? Are we talking about beam width - i.e. unbounded in a direction at right angles to the direction of travel?
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