Magnetic field detectable around axis of laser beam?

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Gravitron
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I've looked for this subject but perhaps I'm asking the question the wrong way. Please advise.
Is there an extension of magnetic field (flux) beyond the beam axis of a laser? In other words, can one detect (or has anypone attempted to detect) the magnetic field around the a light beam in a vacuum without actually entering or interupting the beam?

Thanks
G
 
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I'm sure of the correct answer. But I once looked up what the radially symmetric solution to a wave propagating in one direction is.

The only solutions is Bessel beams
http://arxiv.org/abs/physics/0006046 (page 6)

The magnetic field oscillates and falls off as [itex]1/\sqrt{\varrho}[/itex]

Maybe that's the answer.