Helical-wavefront laser beams produced with a spiral phaseplate
Marco W. Beijersbergen
,
R.P.C. Coerwinkel
,
M. Kristensen
,
Marco W. Beijersbergen
,
R.P.C. Coerwinkel
,
M. Kristensen
,
J. P. Woerdman
1994
Optics Communications
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