Orbital angular momentum of the laser beam and the second order intensity moments |
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| Authors: | GAO Chunqing WEI Guanghui Horst Weber |
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| Institution: | 1. Optical Engineering Department, Beijing Institute of Technology, Beijing 100081, China
2. Optical Institute, Technical University Berlin, Strasse des 17. Juni 135, D_10623 Berlin, Germany |
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| Abstract: | From the wave equation of a generalized beam the orbital angular momentum is studied. It is shown that the orbital angular
momentum exists not only in the Laguerre-Gaussian beam, but in any beam with an angular-dependent structure. By calculating
the second order intensity moments of the beam the relation between the orbital angular momentum and the second order moments
(x θy), (y θx) is given. As an example the orbital angular momentum of the general astigmatic Gaussian beam is studied. |
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| Keywords: | orbital angular momentum second order moments beam characterization |
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