Journal ArticleDOI
Asymmetric Gaussian optical vortex
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TLDR
It is shown that depending on the shift distance the laser beam has the form of a crescent, which is rotated upon propagation, and an analytical expression is obtained for the orbital angular momentum of such a beam, which appears to be fractional.Abstract:
We theoretically study a Gaussian optical beam with an embedded off-axis optical vortex. We also experimentally generate such an asymmetric Gaussian optical vortex by using an off-axis spiral phase plate. It is shown that depending on the shift distance the laser beam has the form of a crescent, which is rotated upon propagation. An analytical expression is obtained for the orbital angular momentum of such a beam, which appears to be fractional. When the shift increases, the greater the number of spirality of the phase plate or the “fork” hologram, the slower the momentum decreases. The experimental results are in qualitative agreement with the theory.read more
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Superpositions of the orbital angular momentum for applications in quantum experiments : Special issue on atoms and angular momentum of light
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Orbital angular momentum of a laser beam behind an off-axis spiral phase plate.
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References
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Journal ArticleDOI
Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes.
TL;DR: Laser light with a Laguerre-Gaussian amplitude distribution is found to have a well-defined orbital angular momentum and an astigmatic optical system may be used to transform a high-order LaguERre- Gaussian mode into aHigh-order Hermite-Gaussia mode reversibly.
Journal ArticleDOI
Entanglement of the orbital angular momentum states of photons
TL;DR: This work demonstrates entanglement involving the spatial modes of the electromagnetic field carrying orbital angular momentum, which provides a practical route to entangled states that involves many orthogonal quantum states, rather than just two Multi-dimensional entangled states could be of considerable importance in the field of quantum information, enabling, for example, more efficient use of communication channels in quantum cryptography.
Journal ArticleDOI
Entanglement of Orbital Angular Momentum States of Photons
TL;DR: In this article, the orbital angular momentum of photons is exploited to achieve multi-dimensional entanglement in higher dimensions, i.e., the state of the electromagnetic field with phase singularities (doughnut modes).
Journal ArticleDOI
Superpositions of the orbital angular momentum for applications in quantum experiments
TL;DR: In this paper, two different experimental techniques for preparing and analysing superpositions of Gaussian and Laguerre-Gaussian modes are presented, which involve exploiting an interferometric method in one case and using computer generated holograms in the other.
Journal Article
Superpositions of the orbital angular momentum for applications in quantum experiments : Special issue on atoms and angular momentum of light
TL;DR: In this paper, two different experimental techniques for preparing and analysing superpositions of Gaussian and Laguerre-Gaussian modes are presented, which involve exploiting an interferometric method in one case and using computer generated holograms in the other.