Observation of the orbital angular momentum spectrum of a light beam.
We demonstrate an experimental scheme that allows the elucidation of the orbital angular momentum discrete spectrum of an arbitrary light signal. The orbital angular momentum spectrum is represented in a Laguerre-Gaussian mode base, and the spectral components are resolved in the frequency domain by exploiting the Doppler frequency shift that is imparted to rotating light beams.
Vasnetsov
M V
MV
ICFO-Institut de Ciencies Fotoniques, Department of Signal Theory and Communications, Universitat Politecnica de Catalunya, 08034 Barcelona, Spain. vasnet@hotmail.com
Torres
J P
JP
Petrov
D V
DV
Torner
Lluis
L