The generation of free-space Laguerre-Gaussian modes at millimetre-wave frequencies by use of a spiral phaseplate

A spiral phaseplate is used at millimetre-wave frequencies to transform a free-space, fundamental Hermite-Gaussian mode into a Laguerre-Gaussian mode with an azimuthal phase component. A ray optics analysis confirms that the Laguerre-Gaussian beam produced has a total angular momentum equivalent to...

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Bibliographic Details
Published in:Optics communications 1996-06, Vol.127 (4), p.183-188
Main Authors: Turnbull, G.A., Robertson, D.A., Smith, G.M., Allen, L., Padgett, M.J.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
Wave optics
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Summary:A spiral phaseplate is used at millimetre-wave frequencies to transform a free-space, fundamental Hermite-Gaussian mode into a Laguerre-Gaussian mode with an azimuthal phase component. A ray optics analysis confirms that the Laguerre-Gaussian beam produced has a total angular momentum equivalent to ℓħ per photon.
ISSN:0030-4018
1873-0310
DOI:10.1016/0030-4018(96)00070-3