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. 2016 Mar 1;6:22082. doi: 10.1038/srep22082

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(a) Transverse intensity profile of a BG beam. Dashed circle signifies opaque circular obstruction placed at the beam centre. In experiment, the obstruction is laterally moved to block the beam at various transverse positions. (b) Cross-section of BG beam intensity. Dashed line represents the cross-section of the opaque obstruction. Here is the radius of the obstruction, and is the spot size of the beam as determined by measurements and subsequently calculating the second moment of the intensity.

Inline graphic — (a) Transverse intensity profile of a BG beam. Dashed circle signifies opaque circular obstruction placed at the beam centre. In experiment, the obstruction is laterally moved to block the beam at various transverse positions. (b) Cross-section of BG beam intensity. Dashed line represents the cross-section of the opaque obstruction. Here is the radius of the obstruction, and is the spot size of the beam as determined by measurements and subsequently calculating the second moment of the intensity.