Analysis of orbital angular momentum of a misaligned optical beam

Vasnetsov, M. V.; Pas’ko, V. A.; Soskin, M. S.

doi:10.1088/1367-2630/7/1/046

Cited by 155 publications

(103 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the measured results, mode purity degradation could arise from rotational symmetry-breaking factors, such as the nonideal intensity distribution of the emitted beam from the VCSEL (i.e., deviation from Gaussian distribution), any small misalignments between the optical axis of the VCSEL and SPP's centers [3], and imperfections in the SPP fabrication. Also any small misalignments in the optical system will cause spreading of power into nearby modes [33]. Therefore, the measured purity of OAM modes is limited as a result of the generation of unwanted modes due to these nonideal factors [34].…”

Section: Research Articlementioning

confidence: 99%

Orbital angular momentum vertical-cavity surface-emitting lasers

Phillips

Wang

et al. 2015

Optica

120

View full text Add to dashboard Cite

Harnessing the orbital angular momentum (OAM) of light is an appealing approach to developing photonic technologies for future applications in optical communications and high-dimensional quantum key distribution (QKD) systems. An outstanding challenge to the widespread uptake of the OAM resource is its efficient generation. In this work we design a new device that can directly emit an OAM-carrying light beam from a low-cost semiconductor laser. By fabricating micro-scale spiral phase plates within the aperture of a vertical-cavity surface-emitting laser (VCSEL), the linearly polarized Gaussian beam emitted by the VCSEL is converted into a beam carrying specific OAM modes and their superposition states, with high efficiency and high beam quality. This new approach to OAM generation may be particularly useful in the field of OAM-based optical and quantum communications, especially for short-reach data interconnects and QKD.

show abstract

Section: Research Articlementioning

confidence: 99%

Orbital angular momentum vertical-cavity surface-emitting lasers

Phillips

Wang

et al. 2015

Optica

120

View full text Add to dashboard Cite

show abstract

“…We have shown that for higher values of topological charge, the radial intensity contrast of a beam is more resilient to a reduction in spatial coherence of the source. This can be understood by considering the instantaneous OAM modal-decomposition of one member of the ensemble of light fields that form the beam (21,22). When an OAM beam is slightly displaced offaxis, power is spread into neighbouring modes of the OAM decomposition.…”

Section: Discussionmentioning

confidence: 99%

The transition from a coherent optical vortex to a Rankine vortex: beam contrast dependence on topological charge

Toninelli

Aspden

Phillips

et al. 2016

Journal of Modern Optics

View full text Add to dashboard Cite

Spatially coherent helically phased light beams carry orbital angular momentum (OAM) and contain phase singularities at their centre. Destructive interference at the position of the phase singularity means the intensity at this point is necessarily zero, which results in a high contrast between the centre and the surrounding annular intensity distribution. Beams of reduced spatial coherence yet still carrying OAM have previously been referred to as Rankine vortices. Such beams no longer possess zero intensity at their centre, exhibiting a contrast that decreases as their spatial coherence is reduced. In this work, we study the contrast of a vortex beam as a function of its spatial coherence and topological charge. We show that beams carrying higher values of topological charge display a radial intensity contrast that is more resilient to a reduction in spatial coherence of the source.

show abstract

“…(See Supplementary Methods for an explicit analysis of these beam-misalignment perturbations. 42 ) Also, the main optical effects arising from atmospheric turbulence, such as beam wandering and spreading are mirror-symmetric, so that the extent of qubit alteration is expected to be much less significant in our communication scheme than in the case of pure OAM communication.…”

Section: Robustness Of Rotational-invariant Hybrid Qubitsmentioning

confidence: 99%

Complete experimental toolbox for alignment-free quantum communication

et al. 2012

View full text Add to dashboard Cite

Quantum communication employs the counter-intuitive features of quantum physics for tasks that are impossible in the classical world. It is crucial for testing the foundations of quantum theory and promises to revolutionize information and communication technologies. However, to execute even the simplest quantum transmission, one must establish, and maintain, a shared reference frame. This introduces a considerable overhead in resources, particularly if the parties are in motion or rotating relative to each other. Here we experimentally show how to circumvent this problem with the transmission of quantum information encoded in rotationally invariant states of single photons. By developing a complete toolbox for the efficient encoding and decoding of quantum information in such photonic qubits, we demonstrate the feasibility of alignment-free quantum key-distribution, and perform proofof-principle demonstrations of alignment-free entanglement distribution and Bell-inequality violation. The scheme should find applications in fundamental tests of quantum mechanics and satellite-based quantum communication.

show abstract

Analysis of orbital angular momentum of a misaligned optical beam

Cited by 155 publications

References 19 publications

Orbital angular momentum vertical-cavity surface-emitting lasers

Orbital angular momentum vertical-cavity surface-emitting lasers

The transition from a coherent optical vortex to a Rankine vortex: beam contrast dependence on topological charge

Complete experimental toolbox for alignment-free quantum communication

Contact Info

Product

Resources

About