# Magnetic field detectable around axis of laser beam?

1. Aug 27, 2009

### Gravitron

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

2. Aug 30, 2009

### Gerenuk

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 $1/\sqrt{\varrho}$